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Long-term stabilization of chromium,copper,and zinc co-contaminated soil using phosphorylated zero-valent iron 认领 引用
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作者 Lu Liu Shiwei Huang +3 位作者 Kaiting Cao Qiming Wang Hao Xu Weichun Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期328-337,共10页
Heavy metal contamination of soil,particularly the co-contamination of chromium,copper,and zinc,has emerged as a significant threat to ecological systems and human health.This study developed a phosphorylated zero-val... Heavy metal contamination of soil,particularly the co-contamination of chromium,copper,and zinc,has emerged as a significant threat to ecological systems and human health.This study developed a phosphorylated zero-valent iron(ZVI/PR) material through a ball milling process that combines natural phosphate rock with iron powder,aiming to detoxify and stabilize heavy metals in soil simultaneously.Experimental results demonstrated that ZVI/PR exhibited superior removal efficiencies for Cr(Ⅵ),Cu(Ⅱ),and Zn(Ⅱ)-6.49,4.85,and 21.32 times higher,respectively,than those of ball-milled phosphate rock(BMP),and 5.99,6.98,and 21.00 times higher than those of ball-milled zero-valent iron(BMZ).ZVI/PR demonstrated increased reactivity and effective pH self-regulation capabilities.The ZVI/PR promoted the sustained release of Fe(Ⅱ),facilitating the simultaneous stabilization of Cr,Cu,and Zn.ZVI/PR significantly reduced heavy metal concentrations in the soil,with Cr(Ⅵ) removal efficiency reaching 99.04 %,and the stabilization efficiencies of DTPA-extractable Cu and Zn exceeded 60 % in the cocontaminated soil.Soil treated with ZVI/PR showed a significant increase in stable fractions(residual and organic matter-bound fractions) of Cr(16 % to 41 % in seven days),Cu(16.8 % to 59.6 % in one day),and Zn(11.56 % to23.46 % over 28 days) compared to untreated soil.Notably,after 180 days of the toxicity characteristic leaching procedure test,ZVI/PR demonstrated long-term stability in soil remediation.This study offers a cost-effective method for remediating soils co-contaminated with multiple heavy metals. 展开更多
关键词 Zero-valent iron Phosphate rock Co-contaminated soil Simultaneous stabilization Long-term stability
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Treatment of nitrogen-contained refractory organic wastewater by micron zero-valent iron based two-stage process:Synergistic contaminant degradation and ammonia nitrogen formation 认领 引用
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作者 Yan Zhang Shuo Chen +7 位作者 Huihui Peng Ankang Wang Yiming Sun Chenying Zhou Shuang Meng Chuanshu He Peng Zhou Bo Lai 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第7期239-246,共8页
The treatment of nitrogen-contained refractory organic wastewater faces challenges due to complex composition and high toxicity.While microscale zero-valent iron(mZVI)based processes enable simultaneous removal of org... The treatment of nitrogen-contained refractory organic wastewater faces challenges due to complex composition and high toxicity.While microscale zero-valent iron(mZVI)based processes enable simultaneous removal of organic contaminants and nitrate(NO3--N),electron competition and excessive iron sludge generation limit efficiency.This study reveals the dual roles of NO3--N in the mZVI/O2 process:Inhibiting the oxidative removal of organic contaminants through electron competition and simultaneously enhancing iron dissolution with TFe increased by 17.5% to 65.7%compared to the system without NO3--N.Nitrogen conversion analysis indicates that NO3--N is mainly converted to NH4+-N via a direct 8-electron reduction pathway.To increase the utilization efficiency of iron electrons and enhance organic contaminant removal,a two-stage gradient oxidation process(mZVI/O2-Fenton)is designed:1st stage utilizes NO3--N to enhance Fe0 corrosion for NO3--N reduction and Fe(Ⅱ)release,while 2nd stage achieves efficient organic contaminants degradation via Fenton reaction with addition of H2O2.Actual wastewater validation confirms synergistic high organic contaminants removal(COD removal>79.5%)and targeted nitrogen conversion(>66.4% NO3--N to NH4+-N).The study overcomes electron competition limitations in the mZVI/O2 process and provides a synergistic pollution control-resource recovery strategy for NO3--N-contained refractory organic wastewaters. 展开更多
关键词 Microscale zero-valent iron Nitrogen transformation Refractory organic wastewater Ammonia nitrogen formation Two-stage gradient oxidation process
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Biogeochemical mechanisms of zero-valent iron and biochar for synergistically mitigating antimony uptake in rice 认领 引用 被引量：2
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作者 Xiaofeng Zhang Jialin Chi +7 位作者 Huanyun Yu Liping Fang Tongxu Liu Yanhong Du Chuanping Liu Xiangqin Wang Qian Xu Fangbai Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第7期76-86,共11页
Antimony(Sb)contamination in paddy fields can lead to its accumulation in rice grains,posing a threat to food safety.To address this issue,the combined use of zero-valent iron(ZVI)and biochar(BC)were applied to decrea... Antimony(Sb)contamination in paddy fields can lead to its accumulation in rice grains,posing a threat to food safety.To address this issue,the combined use of zero-valent iron(ZVI)and biochar(BC)were applied to decrease the uptake of Sb in Sb-polluted soils,and their effects on Sb uptake from soil to rice grains were investigated.Our results showed that the combination treatment of 0.05%ZVI and 0.095%BC resulted in a significant decrease(42.8%)in Sb accumulation in rice grains that was comparably more efficient than that by 0.05%ZVI(decrease of 15.8%Sb accumulation)or 0.095%BC(decrease of 12.7%Sb accumulation)alone,demonstrating the synergistic effect of ZVI and BC on mitigating Sb uptake by rice plants.ZVI presence resulted in the formation of iron oxides in the soil and on root surfaces,and the S2-/S22-ascent also increased by 58.7%on day 75 compared with that of the control,facilitating the reduction of Sb(Ⅴ)to less mobile Sb(Ⅲ),thereby decreasing Sb accumulation in rice plants.BC initially increased themobility of Sb owing to its alkaline nature,whereas the electron shuttle properties of BC contributed to a decrease in Sbmobility.The abundance of the arsenite-reducing gene arrA ultimately increased by 203.2% on day 120 compared with the initial phase on day 5,and BC caused a remarkable increase in arrA gene abundance.This study revealed the synergistic mechanisms by combining ZVI and BC to mitigate Sb uptake by rice,which may be useful for the sustainable remediation of contaminated rice paddies. 展开更多
关键词 Antimony Zero-valent iron Biochar Synergistic remediation Soil-rice system
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Efficient remediation of different concentrations of Cr-contaminated soils by nano zero-valent iron modified with carboxymethyl cellulose and biochar 认领 引用 被引量：2
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作者 Lihong Xie Qiyan Ma +7 位作者 Qingjun Chen Yiyang Liu Pengfei Guo Jinlan Zhang Guilan Duan Aijun Lin Tingting Zhang Shangyi Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第1期474-486,共13页
Nano zero-valent iron(nZVI)is widely used in soil remediation due to its high reactivity.However,the easy agglomeration,poor antioxidant ability and passivation layer of Fe-Cr coprecipitates of nZVI have limited its a... Nano zero-valent iron(nZVI)is widely used in soil remediation due to its high reactivity.However,the easy agglomeration,poor antioxidant ability and passivation layer of Fe-Cr coprecipitates of nZVI have limited its application scale in Cr-contaminated soil remediation,especially in high concentration of Cr-contaminated soil.Herein,we found that the carboxymethyl cellulose on nZVI particles could increase the zeta potential value of soil and change the phase of nZVI.Along with the presence of biochar,97.0%and 96.6%Cr immobilization efficiency through CMC-nZVI/BC were respectively achieved in high and low concentrations of Cr-contaminated soils after 90-days remediation.In addition,the immobilization efficiency of Cr(VI)only decreased by 5.1%through CMC-nZVI/BC treatment after 10 weeks aging in air,attributing to the strong antioxidation ability.As for the surrounding Crcontaminated groundwater,the Cr(VI)removal capacity of CMC-nZVI/BC was evaluated under different reaction conditions through column experiments and COMSOL Multiphysics.CMC-nZVI/BC could efficiently remove 85%of Cr(VI)in about 400 hr when the initial Cr(VI)concentration was 40 mg/L and the flow rate was 0.5 mL/min.This study demonstrates that uniformly dispersed CMC-nZVI/BC has an excellent remediation effect on different concentrations of Cr-contaminated soils. 展开更多
关键词 Carboxymethyl cellulose Nanoscale zero-valent iron Biochar Cr-contaminated soils
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Metabolomic and gut-microbial responses of earthworms exposed to microcystins and nano zero-valent iron in soil 认领 引用 被引量：2
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作者 Yifan Wang Chunlong Zhang +1 位作者 Daohui Lin Jianying Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第4期340-348,共9页
The earthworm-based vermiremediation facilitated with benign chemicals such as nano zero-valent iron(nZVI)is a promising approach for the remediation of a variety of soil contaminants including cyanotoxins.As themost ... The earthworm-based vermiremediation facilitated with benign chemicals such as nano zero-valent iron(nZVI)is a promising approach for the remediation of a variety of soil contaminants including cyanotoxins.As themost toxic cyanotoxin,microcystin-LR(MC-LR)enter soil via runoff,irrigated surface water and sewage,and the application of cyanobacterial biofertilizers as part of the sustainable agricultural practice.Earthworms in such remediation systems must sustain the potential risk from both nZVI and MC-LR.In the present study,earthworms(Eisenia fetida)were exposed up to 14 days to MC-LR and nZVI(individually and inmixture),and the toxicity was investigated at both the organismal andmetabolic levels,including growth,tissue damage,oxidative stress,metabolic response and gut microbiota.Results showed that co-exposure of MC-LR and nZVI is less potent to earthworms than that of separate exposure.Histological observations in the co-exposure group revealed only minor epidermal brokenness,and KEGG enrichment analysis showed that co-exposure induced earthworms to regulate glutathione biosynthesis for detoxification and reduced adverse effects from MC-LR.The combined use of nZVI promoted the growth and reproduction of soil and earthworm gut bacteria(e.g.,Sphingobacterium and Acinetobacter)responsible for the degradation of MC-LR,whichmight explain the observed antagonism between nZVI and MC-LR in earthworm microcosm.Our study suggests the beneficial use of nZVI to detoxify pollutants in earthworm-based vermiremediation systems where freshwater containing cyanobacterial blooms is frequently used to irrigate soil and supply water for the growth and metabolism of earthworms. 展开更多
关键词 Nano zero-valent iron Microcystin-LR Mixed exposure Vermiremediation Metabolic pathways Gut microbiota
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Efficient U(VI) removal by Ti3C2Tx nanosheets modified with sulfidated nano zero-valent iron: Batch experiments, mechanism, and biotoxicity assessment 认领 引用
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作者 Liping Liang Mengfan Zhou +8 位作者 Fenfen Xi Chaoqi Bai Shenghua Wang Shuyun Luo Jingqi Liu Yangyang Hu Yuxuan Zeng Wangliang Yang Baowei Hu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第6期563-576,共14页
The MXenes,a new class of two-dimensional layered materials,have found extensive applications in water treatment for its excellent thermal stability,electrical conductivity,and excellent adsorption ability.Sulfidized ... The MXenes,a new class of two-dimensional layered materials,have found extensive applications in water treatment for its excellent thermal stability,electrical conductivity,and excellent adsorption ability.Sulfidized nano zero-valent iron(S-nZVI)is a good reducing agent,however,the practical application of S-nZVI is currently restricted due to the tendency of nano materials to agglomerate.Herein,MXenes use as a support and in situ loading S-nZVI on it to prepare a new material(S-nZVI/Ti3C2Tx),and applied it to U(VI)removal in water treatment.The microscopic characterization proves that S-nZVI on Ti3C2Tx has good dispersion and effectively alleviates agglomeration.Batch experiments shown that SnZVI/Ti3C2Tx has a very good effect on U(VI)removal,and themaximumadsorption capacity reaches 674.4mg/g under the aerobic condition at pH=6.0.The pseudo-second-order kinetic model and the Langmuir isotherm model were found to be more appropriate for describing the adsorption behavior.This indicates that the removal process is a single molecular layer chemisorption.Moreover,the S-nZVI/Ti3C2Tx maintained a removal efficiency of over 85%for U(VI)even after being reused five times,demonstrating its excellent reusability.It is worth noting that the material can remove 79.8%of 50 mg/L of U(VI)in simulated seawater,indicating that S-nZVI/Ti3C2Tx possessed an excellent uranium extraction performance from seawater.Experimental results and XPS analysis showed that U(VI)was removed by adsorption,reduction and co-precipitation.Moreover,S-nZVI/Ti3C2Tx was a lowtoxicitymaterial to Hyriopsis cumingii.Therefore,S-nZVI/Ti3C2Tx was expected to be a candidate as adsorbent with great potential in removal of uranium from wastewater and seawater. 展开更多
关键词 Sulfidated nano zero-valent iron Ti3C2Tx U(VI) Adsorption Reduction Biological toxicity
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Volatile fatty acids produced by waste activated sludge with low-dose nano-zero-valent iron synchronized with low-intensity ultrasonication pretreatment 认领 引用
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作者 Yingte Li Yexuan Wen +6 位作者 Shiting Liu Baihong An Taoqin Chen Jianyue Zhang Jinfeng Liu Hongbin Chen Xianchun Tang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第11期340-353,共14页
Recently,using anaerobic hydrolysis of waste activated sludge (WAS) to recover volatile fatty acids (VFAs) as carbon sources for denitrification has been widely studied,and the key is to solve the problem of improving... Recently,using anaerobic hydrolysis of waste activated sludge (WAS) to recover volatile fatty acids (VFAs) as carbon sources for denitrification has been widely studied,and the key is to solve the problem of improving the solubility and bioavailability of WAS organic matter.Considering the energy consumption and chemical cost,this paper used low-dose nanozero-valent iron (NZVI) coupled with low-intensity ultrasonication (US) to pretreat WAS,and explored the effects of different treatment sequences on the fragmentation of WAS flocs particles,the dissolution of organic matter,and the subsequent biofermentation conversion process.The results showed low-dose NZVI synchronized with low-intensity US (NZVIUS)worked best for WAS anaerobic fermentation.Compared with 2062 mg/L in control group,soluble chemical oxygen demand (SCOD) after NZVIUS treatment reached up to 2786 mg/L during the fermentation cycle,and the initial release rate of SCOD increased by 69%.The VFAs production was elevated from 1522 to 1940 mg COD/L.NZVIUS pretreatment promoted the solubilization of attached organic matter,manifested by the fragmentation of WAS flocs and cell lysis.At the same time,proteins and carbohydrates in the extracellular polymeric substances (EPS) had different types of migration and transformation,and transfer of EPS can contribute 35.6% to SCOD.Moreover,adding NZVI promoted PO43--P recovery in the fermentation supernatant by 22.3% more than in day 4 control.This study demonstrated that the NZVIUS pretreatment method can effectively improve the production of VFAs by WAS anaerobic fermentation,meeting the practical needs of wastewater plants. 展开更多
关键词 Ultrasonication Nano zero-valent iron Anaerobic fermentation Volatile fatty acids
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Remediation of sulfamethoxazole contaminated soil using sulfidated zero-valent iron:The overlooked size and sulfur content effects 认领 引用
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作者 Chenyu Nie Yinshun Dai +6 位作者 Zhongkai Duan Yucheng Feng Yi Chen Haijun Chen Chao Song Shuguang Wang Shan Zhao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期853-866,共14页
Sulfamethoxazole(SMX)contamination in farmland disrupts soil micro-ecological functions,posing a risk to soil health and productivity.Sulfidated zero-valent iron(SZVI),a promising green material known for its good rea... Sulfamethoxazole(SMX)contamination in farmland disrupts soil micro-ecological functions,posing a risk to soil health and productivity.Sulfidated zero-valent iron(SZVI),a promising green material known for its good reactivity,had been used for soil remediation.However,existing studies often overlooked the effects of particle size and sulfur content on the long-term performance of SZVI and its impact on soil micro-ecological safety.This study employed polysulfide-modified nano,micro-nano,and micron-sized SZVI to investigate how particle size and sulfur content influenced the reactivity and durability,as well as the iron oxide forms and microbial community of soil during the SMX remediation.The results demonstrated that micro-nano sized SZVI(nm-SZVI)exhibited prolonged reactivity,achieving 83.12%-99.91%SMX removal over 30 days and maintaining higher levels of soil amorphous and reactive ferrous iron.Although sulfidation improved reactivity,excessive sulfur content reduced removal efficiency and accelerated the conversion to soil crystalline iron forms.Compared to nanoparticles,nm-SZVI fostered microbial diversity and balanced functional bacteria for electron transfer,organic matter utilization,and nutrient cycling.However,the elevated sulfur content in SZVI inhibited the stability of the microbial network.Finally,it was found that SMX underwent isoxazole reduction cleavage and oxidative removal pathways,reducing ecological toxicity.This study provided a new insight into the rational design of SZVI to achieve long-term pollutant removal and ensuring the health and stability of the microbial community by regulating particle size and sulfur content in soil remediation. 展开更多
关键词 Sulfidated zero-valent iron Sulfamethoxazole Particle size Sulfur content Soil iron(hydr)oxide Microorganism
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Removal of 1,2,3-Trichloropropane from groundwater using Graphene Oxide-Modified Nano Zero-Valent Iron Activated Persulfate 认领 引用
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作者 Hui Li Lu Liu +3 位作者 Jia-hui Li Bai-zhong Yan Xiang-ke Kong Wei Zhang 《Journal of Groundwater Science and Engineering》 2025年第4期341-351,共11页
Graphene Oxide(GO),nanoscale Zero-Valent Iron(nZVI)and GO-modified nZVI(GO-nZVI)composite materials were prepared by the Hummer and polyphenol reduction method,respectively,and Scanning Electron Microscope(SEM)and X-r... Graphene Oxide(GO),nanoscale Zero-Valent Iron(nZVI)and GO-modified nZVI(GO-nZVI)composite materials were prepared by the Hummer and polyphenol reduction method,respectively,and Scanning Electron Microscope(SEM)and X-ray Diffraction(XRD)were used to characterize the morphology and phase composition of these materials.A series of batch experiments were then conducted to inves-tigate the performance and influencing factors of GO-nZVI activating peroxydisulfate(SPS)for the degra-dation of 1,2,3-trichloropropane(TCP).Finally,an in-situ oxidation reaction zone was created by GO-nZVI-activated SPS in a one-dimensional simulated system to study the remediation of TCP contamination under different aquifer conditions.The results showed that the GO-nZVI composite exhibited a porous,fluffy structure,with spherical nZVI particles loaded onto the surface and folds of the GO sheets.Compared with unmodified nZVI particles,the GO-nZVI composite significantly enhanced the removal efficiency of TCP by activated SPS,achieving a removal rate of 67.2%within an hour-78.2%higher than that of the unmodi-fied system.The SPS dosage and the C/Fe ratio in GO-nZVI were found to significantly affect the degradation efficiency of TCP.The removal rate of TCP increased with higher SPS concentration,and a 10%carbon addition,yielded the best activation effect.The one-dimensional simulation results indicated that the removal rate of TCP ranged from 30.1%to 73.3%under different conditions.A larger medium particle size and higher concentrations of reactants(SPS and GO-nZVI)improved pollutant degradation efficiency,increasing TCP removal by 62.1%,23.8%,and 3.7%,respectively.In contrast,a higher groundwater flow velocity was not conducive to the removal of pollutants,with the TCP removal rate decreasing by approxi-mately 41.9%. 展开更多
关键词 Graphene oxide Nanoscale zero-valent iron Persulfate 1,2,3-Trichloropropane Groundwa-ter In-situ reaction zone
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Effects of pH and particle size on kinetics of nitrobenzene reduction by zero-valent iron 认领 引用 被引量：30
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作者 Jun Dong Yongsheng Zhao +1 位作者 Ran Zhao Rui Zhou 《Journal of Environmental Sciences》 SCIE EI CAS 2010年第11期1741-1747,共7页
Nitrobenzene has been considered as a significant groundwater contaminant due to its wide usage in explosives, insecticides, herbicides, pharmaceuticals and dyes. Nitrobenzene is of environmental concern because of it... Nitrobenzene has been considered as a significant groundwater contaminant due to its wide usage in explosives, insecticides, herbicides, pharmaceuticals and dyes. Nitrobenzene is of environmental concern because of its toxicity. In the presence of zero-valent iron （ZVI）, reduction of the nitro group is the dominant transformation process for nitrobenzene. A series of experiments were carried out to investigate the kinetics of nitrobenzene reduction by ZVI and the effects of pH and ZVI particle size on nitrobenzene removal in groundwater. The results indicated that nitrobenzene could be reduced to aniline by ZVI; the reduction of nitrobenzene by ZVI followed a pseudo first-order kinetics; the observed nitrobenzene reduction rate constant （k obs ） was 0.0006 min^-1 and the half-life of nitrobenzene （t 1/2 ） was 115.5 min; the mass balance achieved 87.5% for nitrobenzene reduction by the 1 mm ZVI particle and the final removal efficiency was 80.98%. In addition, the pH and ZVI particle size were found to exhibit significant influences on the nitrobenzene reduction. The observed nitrobenzene reduction rate constant linearly decreased with increase pH and the data fitted on polynomial regression equation for the observed nitrobenzene reduction rate constant and ZVI particle size. Therefore, use of ZVI based permeable reactive barrier technology to remedy nitrobenzene contaminated groundwater was feasible. 展开更多
关键词 zero-valent iron nitrobenzene reduction aniline formation particle size
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Performance and mechanism of Cr(Ⅵ)removal by zero-valent iron loaded onto expanded graphite 认领 引用 被引量：17
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作者 Congbin Xu Wenjie Yang +3 位作者 Weijiang Liu Hongliang Sun Chunlei Jiao Ai-jun Lin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第5期14-22,共9页
Zero-valent iron（ZⅥ） was loaded on expanded graphite（EG） to produce a composite material（EG-ZⅥ） for efficient removal of hexavalent chromium（Cr（Ⅵ））. EG and EG-ZⅥ were characterized by X-ray diffraction（... Zero-valent iron（ZⅥ） was loaded on expanded graphite（EG） to produce a composite material（EG-ZⅥ） for efficient removal of hexavalent chromium（Cr（Ⅵ））. EG and EG-ZⅥ were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）,Fourier-transform infrared（FTIR） spectroscopy and Brunauer–Emmett–Teller（BET） analysis. EG-ZⅥ had a high specific surface area and contained sub-micron sized particles of zero-valent iron. Batch experiments were employed to evaluate the Cr（Ⅵ） removal performance. The results showed that the Cr（Ⅵ） removal rate was 98.80% for EG-ZⅥ,which was higher than that for both EG（10.00%） and ZⅥ（29.80%）. Furthermore, the removal rate of Cr（Ⅵ） by EG-ZⅥ showed little dependence on solution p H within a p H range of 1–9.Even at pH 11, a Cr（Ⅵ） removal rate of 62.44% was obtained after reaction for 1 hr. EG-ZⅥ could enhance the removal of Cr（Ⅵ） via chemical reduction and physical adsorption,respectively. X-ray photoelectron spectroscopy（XPS） was used to analyze the mechanisms of Cr（Ⅵ） removal, which indicated that the ZⅥ loaded on the surface was oxidized, and the removed Cr（Ⅵ） was immobilized via the formation of Cr（III） hydroxide and Cr（III）–Fe（III）hydroxide/oxyhydroxide on the surface of EG-ZⅥ. 展开更多
关键词 Zero-valent iron（ZVI） Expanded graphite（EG） Cr（Ⅵ） removalMechanism
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Superior trichloroethylene removal from water by sulfide-modified nanoscale zero-valent iron/graphene aerogel composite 认领 引用 被引量：11
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作者 Qiong Bin Bin Lin +5 位作者 Ke Zhu Yaqian Shen Yuanyuan Man Boyang Wang Changfei Lai Wenjin Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第2期90-102,共13页
Sulfide-modified nanoscale zero-valent iron(S-nZVI) is a promising material for removal of organic pollutants from water, but S-nZVI nanoparticles(NPs) easily agglomerate and have poor contact with organic contaminant... Sulfide-modified nanoscale zero-valent iron(S-nZVI) is a promising material for removal of organic pollutants from water, but S-nZVI nanoparticles(NPs) easily agglomerate and have poor contact with organic contaminants.Herein, we propose a new S-nZVI/graphene aerogel(S-nZVI/GA) composite which exhibits superior removal capability for trichloroethylene(TCE) from water.Three-dimensional porous graphene aerogel(GA) can improve the efficiency of electron transport, enhance the adsorption of organic pollutants and restrain the agglomeration of the core-shell S-nZVI NPs.The TCE removal rates of Fe S, nZVI, GA and S-nZVI were 27.8%, 42%, 63% and 75% in 2 hr, respectively.Furthermore, TCE was completely removed within 50 min by S-nZVI/GA.The TCE removal rate increased with increasing p H and temperature, and TCE removal followed the pseudo-first-order kinetic model.The results demonstrate the great potential of S-nZVI/GA composite as a low-cost,easily separated and superior monolithic adsorbent for removal of organic pollutants. 展开更多
关键词 Organic pollutant removal Trichloroethylene (TCE) Sulfide-modified nanoscale zero-valent iron Graphene aerogel Nanocomposite
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Rapid decolorization of Acid Orange Ⅱ aqueous solution by amorphous zero-valent iron 认领 引用 被引量：12
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作者 Changqin Zhang Zhengwang Zhu +1 位作者 Haifeng Zhang Zhuangqi Hu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第6期1021-1026,共6页
Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was froz... Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was frozen in an amorphous state through a melt-spinning technique,and the decolorization effect of amorphous ZVI on Acid Orange II solution was investigated under varied conditions of experimental variables such as reaction temperature,ribbon dosage,and initial pH.Batch experiments suggested that the decolorization rate was enhanced with the increase of reaction temperature and ribbon dosage,but decreased with increasing initial solution pH.Kinetic analyses indicated that the decolorization process followed a first order exponential kinetic model,and the surface-normalized decolorization rate could reach 2.09 L/（m^2 ·min） at room temperature,which was about ten times larger than any previously reported under similar conditions.Recycling experiments also proved that the ribbons could be reused at least four times without obvious decay of decolorization rate and efficiency.This study suggests a tremendous application potential for amorphous ZVI in remediation of groundwater or wastewater contaminated with azo dyes. 展开更多
关键词 amorphous zero-valent iron Acid Orange Ⅱ decolorization surface-normalized decolorization rate recycle amorphous zero-valent iron Acid Orange II decolorization surface-normalized decolorization rate recycle
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Watering techniques and zero-valent iron biochar pH effects on As and Cd concentrations in rice rhizosphere soils,tissues and yield 认领 引用 被引量：12
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作者 Md Shafiqul Islam Yali Chen +6 位作者 Liping Weng Jie Ma Zulqarnain Haider Khan Zhongbin Liao Abdoul Salam Issiaka Abdoul Magid Yongtao Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2021年第2期144-157,共14页
Zero-valent iron amended biochar(ZVIB)has been proposed as a promising material in immobilizing heavy metals in paddy fields.In this study,the impacts of p H of ZVIB(p H 6.3 and p H 9.7)and watering management techniq... Zero-valent iron amended biochar(ZVIB)has been proposed as a promising material in immobilizing heavy metals in paddy fields.In this study,the impacts of p H of ZVIB(p H 6.3 and p H 9.7)and watering management techniques(watering amount in the order of CON(control,5/72)>3/72>1-3/72>3/100>1/72,with 5/72,for example,representing irrigation given to 5 cm above soil surface in 72 hr regular interval)on As and Cd bioavailability for rice and its grain yield(Yield BR)were investigated in a pot experiment.Brown rice As(As BR)content was irrelative to the watering treatments,while significantly decreased(>50%)with the addition of both ZVIB materials.The diminutions of brown rice Cd(Cd BR)content as well as the Yield BR were highly dependent on both the soil amendment materials’p H and watering amount.Among all the watering treatments,3/72 treatment(15%less irrigation water than the CON)with ZVIB 6.3 amendment was the optimum fit for simultaneous reduction of As BR(50%)and Cd BR contents(19%)as well as for significant increment(12%)of the Yield BR.Although high pH(9.7)ZVIB application could also efficiently decrease As and Cd contents in brown rice,it might risk grain yield lost if appropriate(e.g.3/72 in our study)watering management technique was not chosen.Therefore,ZVIB would be an environmentally friendly option as an amendment material with proper selection of watering management technique to utilize As and Cd co-contaminated arable soils safely for paddy cultivation. 展开更多
关键词 Brown rice As Brown rice Cd Grain yield Paddy soils Water management Zero-valent iron biochar
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Decolorization of Methyl Orange by a new clay-supported nanoscale zero-valent iron:Synergetic effect,efficiency optimization and mechanism 认领 引用 被引量：10
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作者 Xiaoguang Li Ying Zhao +5 位作者 Beidou Xi Xiaoguang Meng Bin Gong Rui Li Xing Peng Hongliang Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第2期8-17,共10页
In this study, a novel nanoscale zero-valent iron（n ZVI） composite material was successfully synthesized using a low-cost natural clay, ＂Hangjin 2~#clay＂（HJ clay） as the support and tested for the decolorization... In this study, a novel nanoscale zero-valent iron（n ZVI） composite material was successfully synthesized using a low-cost natural clay, ＂Hangjin 2~#clay＂（HJ clay） as the support and tested for the decolorization of the azo dye Methyl Orange（MO） in aqueous solution by n ZVI particles. According to the characterization and MO decolorization experiments, the sample with 5：1 HJ clay-supported n ZVI（HJ ZVI） mass ratio（HJ-n ZVI5） showed the best dispersion and reactivity and the highest MO decolorization efficiency. With the same equivalent Fe0 dosage, the HJ-n ZVI1 and HJ-n ZVI5 samples demonstrated a synergetic effect for the decolorization of MO： their decolorization efficiencies were much higher than that achieved by physical mixing of HJ clay and n ZVIs, or the sum of HJ clay and n ZVIs alone. The synergetic effect was primarily due to the improved dispersion and more effective utilization of the n ZVI particles on/in the composite materials. Higher decolorization efficiency of MO was obtained at larger HJ-n ZVI dosage, higher temperature and under N2 atmosphere, while the MO initial concentration and p H were negatively correlated to the efficiency. HJ clay not only works as a carrier for n ZVI nanoparticles, but also contributes to the decolorization through an ＂adsorption-enhanced reduction＂ mechanism. The high efficiency of HJ-n ZVI for decontamination gives it great potential for use in a variety of remediation applications. 展开更多
关键词 Nanoscale zero-valent iron Clay Material optimization Methyl Orange
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Humic acid and metal ions accelerating the dechlorination of 4-chlorobiphenyl by nanoscale zero-valent iron 认领 引用 被引量：6
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作者 Yu Wang Dongmei Zhou +2 位作者 Yujun Wang Xiangdong Zhu Shengyang Jin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2011年第8期1286-1292,共7页
Transformation of polychlorinated biphenyls （PCBs） by zero-valent iron represents one of the latest innovative technologies for environmental remediation. The dechlorination of 4-chlorobiphenyl （4-C1BP） by nanosca... Transformation of polychlorinated biphenyls （PCBs） by zero-valent iron represents one of the latest innovative technologies for environmental remediation. The dechlorination of 4-chlorobiphenyl （4-C1BP） by nanoscale zero-valent iron （NZVI） in the presence of humic acid or metal ions was investigated. The results showed that the dechlorination of 4-C1BP by NZVI increased with decreased solution pH. When the initial pH value was 4.0, 5.5, 6.8, and 9.0, the de.chlorination efficiencies of 4-CIBP after 48 hr were 53.8%, 47.8%, 35.7%, and 35.6%, respectively. The presence of humic acid inhibited the reduction of 4-CIBP in the first 4 hi＇, and then significantly accelerated the dechlorination by reaching 86.3% in 48 hr. Divalent metal ions, Co2＋, Cu2＋, and Ni2＋, were reduced and formed bimetals with NZVI, thereby enhanced the dechlorination of 4-CIBP. The dechlorination percentages of 4-CIBP in the presence of 0.1 mmol/L Co2~, Cuz~ and Niz~ were 66.1%, 66.0% and 64.6% in 48 hr, and then increased to 67.9%, 71.3% and 73.5%, after 96 hr respectively. The dechlorination kinetics of 4-C1BP by the NZVI in all cases followed pseudo-first order model. The results provide a basis for better understanding of the dechlorination mechanisms of PCBs in real environment. 展开更多
关键词 4-chlorobiphenyl nanoscale zero-valent iron humic acid metal ions dechlorination
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Treatment of simulated wastewater containing Reactive Red 195 by zero-valent iron/activated carbon combined with microwave discharge electrodeless lamp/sodium hypochlorite 认领 引用 被引量：6
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作者 Jie Fu Zhen Xu +4 位作者 Qing-Shan Li Song Chen Shu-Qing An Qing-Fu Zeng Hai-Liang Zhu 《Journal of Environmental Sciences》 SCIE EI CAS 2010年第4期512-518,共7页
A comparative study of treatment of simulated wastewater containing Reactive Red 195 using zero-valent iron/activated carbon （ZVI/AC）, microwave discharge electrodeless lamp/sodium hypochlorite （MDEL/NaCIO） and th... A comparative study of treatment of simulated wastewater containing Reactive Red 195 using zero-valent iron/activated carbon （ZVI/AC）, microwave discharge electrodeless lamp/sodium hypochlorite （MDEL/NaCIO） and the combination of ZVI/AC- MDEL/NaCIO was conducted. The preliminary results showed the two steps method of ZVI/AC-MDEL/NaCIO had much higher degradation efficiency than both single steps. The final color removal percentage was nearly up to 100% and the chemical oxygen demand reduction percentage was up to approximately 82%. The effects of operational parameters, including initial pH value of simulated wastewater, ZVI/AC ratio and particle size of ZVI were also investigated. In addition, from the discussion of synergistic effect between ZVI/AC and MEDL/NaCIO, we found that in the ZVI/AC-MEDL/NaCIO process, ZVI/AC could break the azo bond firstly and then MEDLfNaCIO degraded the aromatic amine products effectively. Reversing the order would reduce the degradation efficiency. 展开更多
关键词 activated carbon microwave discharge electrodeless lamp Reactive Red 195 sodium hypochlorite zero-valent iron.
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Enhancing corn stalk-based anaerobic digestion with different types of zero-valent iron added during the acidification stage:Performance and mechanism 认领 引用 被引量：6
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作者 Xiang Liu Yue Liu +2 位作者 Min Wang Qianzhen Deng Hao Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第11期64-74,共11页
Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn stalks.However,few studies have focused on the role of direct interspecies electron transfer(DIET)pathway in the acidi... Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn stalks.However,few studies have focused on the role of direct interspecies electron transfer(DIET)pathway in the acidification stage under the addition of different particle sizes of zero-valent iron(ZVI).In this study,three types of ZVI,namely iron filings,iron powder and nanoscale iron,were investigated,respectively,to enhance its high-value conversion.Variations in volatile fatty acids(VFAs)and methane(CH4)production associated with the underlyingmechanisms were emphatically determined.Results indicated that the addition of ZVI could increase the concentration of VFAs,with the most outstanding performance observed with the use of nanoscale iron.Importantly,the conversion of propionic acid to acetic acid was driven by adding ZVI with no between-group differences in acidizing phase.Conversely,the substrate was more fully utilized when supplied with iron powder compared with other groups in methanogenic phase,thereby displaying the maximumCH4 yield with a value of 263.1 mL/(g total solids(TS)).However,adding nanoscale iron could signally shorten the digestion time(T80),saving 7 days in comparison to the group of iron powder. 展开更多
关键词 Zero-valent iron Corn stalk Anaerobic digestion Volatile fatty acids Methane
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Effects of zero-valent iron added in the flooding or drainage process on cadmium immobilization in an acid paddy soil 认领 引用 被引量：6
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作者 Hanbing Meng Shiwen Hu +8 位作者 Zebin Hong Wenting Chi Guojun Chen Kuan Cheng QiWang Tongxu Liu Fangbai Li Kexue Liu Yang Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第4期19-31,共13页
Zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy soils.However,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain unclear.Herein,Cd-c... Zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy soils.However,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain unclear.Herein,Cd-contaminated paddy soil was incubated for 40days of flooding and then for 15 days of drainage,and the underlying mechanisms of Cd immobilization coupled with Fe/S/N redox processes were investigated.The addition of ZVI to the flooding process was more conducive to Cd immobilization.Less potential available Cd was detected by adding ZVI before flooding,which may be due to the increase in paddy soil pH and newly formed secondary Fe minerals.Moreover,the reductive dissolution of Fe minerals promoted the release of soil colloids,thereby increasing significantly the surface sites and causing Cd immobilization.Additionally,the addition of ZVI before flooding played a vital role in Cd retention after soil drainage.In contrast,the addition of ZVI in the drainage phase was not conducive to Cd retention,which might be due to the rapid decrease in soil pH that inhibited Cd adsorption and further immobilization on soil surfaces.The findings of this study demonstrated that Cd availability in paddy soil was largely reduced by adding ZVI during the flooding period and provide a novel insight into the mechanisms of ZVI remediation in Cd-contaminated paddy soils. 展开更多
关键词 Paddy soil Zero-valent iron Cadmium Flooding and drainage Remediation
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Monodisperse amino-modified nanosized zero-valent iron for selective and recyclable removal of TNT: Synthesis, characterization, and removal mechanism 认领 引用 被引量：5
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作者 Jing Li Qingxiang Zhou +2 位作者 Miao Li Yongli Liu Qinan Song 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2021年第5期69-79,共11页
Nitroaromatic explosives are major pollutants produced during wars that cause serious environmental and health problems. The removal of a typical nitroaromatic explosive, 2,4,6-trinitrotoluene(TNT), from aqueous solut... Nitroaromatic explosives are major pollutants produced during wars that cause serious environmental and health problems. The removal of a typical nitroaromatic explosive, 2,4,6-trinitrotoluene(TNT), from aqueous solution, was conducted using a new recyclable magnetic nano-adsorbent(Fe@SiO2 –NH2). This adsorbent was prepared by grafting amino groups onto Fe@SiO2 particles with a well-defined core-shell structure and demonstrated monodispersity in solution. The removal performance of the nano-adsorbent towards TNT was found to be 2.57 and 4.92 times higher than that towards two analogous explosives, 2,4-dinitrotoluene(2,4-DNT) and 2-nitrotoluene(2-NT), respectively, under neutral conditions. The difference in the removal performance among the three compounds was further compared in terms of the effects of different conditions(pH value, ionic strength, humic acid concentration, adsorbent modification degree and dosage, etc.) and the electrostatic potential distributions of the three compounds. The most significant elevation is owing to modification of amino on Fe@SiO2 which made a 20.7% increase in adsorption efficiency of TNT. The experimental data were well fit by the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model, indicating multilayer adsorption on a heterogeneous surface. The experimental results and theoretical considerations show that the interactions between Fe@SiO2 –NH2 NPs and TNT correspond to dipole-dipole and hydrophobic interactions. These interactions should be considered in the design of an adsorbent. Furthermore, the adaptability to aqueous environment and excellent regeneration capacity of Fe@SiO2 –NH2 NPs makes these remediation materials promising for applications. 展开更多
关键词 Nanosized zero-valent iron particles(NZVIs) 2 4 6-trinitrotoluene(TNT) Removal Mechanism Regeneration
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