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Simultaneous removal of tetracycline and antibiotic resistant bacteria/genes in UV-LED/H2O2 system:Competitive interactions and wavelength dependence 认领 引用
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作者 Jie Wang Jijie Zhang +7 位作者 Defang Ma Zhenxiang Sun Yan Wang Qinyan Yue Yanwei Li Yue Gao Baoyu Gao Xing Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期655-661,共7页
The coexistence of emerging containments,such as antibiotic resistant bacteria(ARB),antibiotic-resistant genes(ARGs)and antibiotics,potentially influence elimination efficiencies in UV light-emitting diode(UV-LED)alon... The coexistence of emerging containments,such as antibiotic resistant bacteria(ARB),antibiotic-resistant genes(ARGs)and antibiotics,potentially influence elimination efficiencies in UV light-emitting diode(UV-LED)alone and UV-LED/H2O2 system as their complex interactions.Tetracycline(TC)degradation efficiency(kF)correlated closely with its UV molar absorbance(R2=0.831)in UV-LED alone system and with·OH yield(R2=0.999)in UV-LED/H2O2 system across studied wavelengths(265,280 and 310 nm).The kF values for intracellular DNA(i-ARGs)also exhibited a high correlation with UV-LED wavelengths in both systems(R2=0.997-0.999).The coexistence of TC and ARB/ARGs resulted in a mutual inhibition of their degradation efficiencies due to competition for photons and·OH,along with the consequent reduction in intracellular ROS within ARB,with their degradation efficiencies exhibiting marked dependence on wavelength in both systems.Notably,the UV-LED/H2O2 system at 265 nm effectively achieved the simultaneous removal of TC,ARB and ARGs with minimal energy consumption,and successfully fragmented ARGs.The degradation pathway of TC was analyzed,and the biotoxicity of its degradation intermediates demonstrated the environmental friendliness and safety of UV-LED/H2O2 technology.This study elucidated the competitive interactions between antibiotics and ARB/ARGs within UV-LED/H2O2 system,providing a promising approach for their simultaneous removal while ensuring energy efficiency. 展开更多
关键词 UV-LED/H2O2 ARB/ARGs Wavelength dependence Competition Simultaneous removal
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Deciphering the flocculation mechanism of cellulose-modified polymers for antibiotic and co-pollutant removal:Structural determinants from structure-activity relationships 认领 引用
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作者 Binjie Yan Chenxu Wang +8 位作者 Qiyun Feng Chao Niu Wenbin Zhao Mengjiao Feng Beibei Liu Yue Gao Qinyan Yue Kangying Guo Baoyu Gao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第6期644-655,共12页
The widespread use of antibiotics has led to their persistent accumulation in aquatic environments.Although flocculation is cost-effective,traditional flocculants exhibit limited removal efficiency for antibiotics.To ... The widespread use of antibiotics has led to their persistent accumulation in aquatic environments.Although flocculation is cost-effective,traditional flocculants exhibit limited removal efficiency for antibiotics.To address this problem,a novel cellulose-based flocculant(CE-DMC)was synthesized from paper pulp rejects.The methacryloxyethyltrimethyl ammonium chloride(DMC)monomer was successfully grafted onto the cellulose backbone with a grafting rate of 64%,endowing CE-DMC with high positive charge density(+71.1 mV at pH 6)and a branched architecture.Flocculation experiments demonstrated the superior performance of CE-DMC in removing four representative antibiotics.Notably distinct removal efficiencies were achieved:ofloxacin exhibited the highest removal(52.6%),followed by sulfamethoxazole(36.4%),norfloxacin(30.9%),and amoxicillin(29.8%),reflecting differential interaction mechanisms with the adsorbent.The flocculation mechanism of CE-DMC could be concluded as follows:(1)charge neutralization via quaternary ammonium groups of DMC chains,(2)n-π*electron donor-acceptor interactions andπ-π*conjugated interactions mediated by benzene rings and furan rings of cellulose skeleton,and(3)hydrogen bonding force provided by the hydroxyl group from the cellulose skeleton and the DMC chains.Notably,coexisting humic acid(HA)and kaolin enhanced antibiotic removal efficiency by forming large composite pollutants via n-π*electron donor-acceptor interactions,hydrogen bonding forces,andπ-π*conjugated interactions.CE-DMC synergistically removed antibiotics and co-pollutants,with its flocculation mechanism elucidated through structure-activity relationships and structural determinants.This work advances the rational design of natural polymer-based flocculants for multi-mechanistic contaminant removal. 展开更多
关键词 Cellulose-based flocculants Paper pulp rejects Antibiotic removal Composite pollutants Flocculation mechanism
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Carbon-based single atom catalyst: Synthesis, characterization, DFT calculations 认领 引用 被引量：17
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作者 Yanan Shang Xiaoguang Duan +3 位作者 Shaobin Wang Qinyan Yue Baoyu Gao Xing Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第2期663-673,共11页
Carbon-based single-atom catalysts(SACs) with atomic sizes of active sites have become the promising candidates for a variety of catalytic systems because of their high atom utilization, and unique electronic structur... Carbon-based single-atom catalysts(SACs) with atomic sizes of active sites have become the promising candidates for a variety of catalytic systems because of their high atom utilization, and unique electronic structures. Different types of single-atom sites can be fabricated via multiple preparation strategies, which would demonstrate distinct different coordination configurations and electronic features, and ultimately affected the structure-catalysis relationship of SACs in targeted reactions. As a result, it is necessary to identify the active sites of SACs and understand the structure-catalysis relationship of SACs at the atomic scale. In this review, a variety of preparation strategies of carbon-based SACs were documented. Then, the recent development on versatile characterization techniques and computational achievements were summarized regarding in understanding the electronic and geometric characteristics of carbon-based SACs.Finally, major challenges and development directions concerning single-atom sites identification and advanced tools development are discussed to shed light on future research of carbon-based SACs. 展开更多
关键词 Single atom Synthesis DFT calculations Characterization Catalysis
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Effect of viscosity,basicity and organic content of composite flocculant on the decolorization performance and mechanism for reactive dyeing wastewater 认领 引用 被引量：35
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作者 Yuanfang Wang Baoyu Gao +1 位作者 Qinyan Yue Yan Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2011年第10期1626-1633,共8页
A coagulation/flocculation process using the composite flocculant polyaluminum chloride-epichlorohydrin dimethylamine(PAC-EPI-DMA)was employed for the treatment of an anionic azo dye(Reactive Brilliant Red K-2BP dye).... A coagulation/flocculation process using the composite flocculant polyaluminum chloride-epichlorohydrin dimethylamine(PAC-EPI-DMA)was employed for the treatment of an anionic azo dye(Reactive Brilliant Red K-2BP dye).The effect of viscosity 01),basicity(B=[OH]/[Al])and organic content(Wp)on the flocculation performance as well as the mechanism of PAC-EPI-DMA flocculant were investigated.Theηwas the key factor affecting the dye removal efficiency of PAC-EPI-DMA.PAC-EPI-DMA with an intermediateη(2400 mPa.sec)gave higher decolorization efficiency by adsorption bridging and charge neutralization due to the co-effect of PAC and EPI-DMA polymers.The Wp of the composite flocculant was a minor important factor for the flocculation.The adsorption bridging of PAC-EPI-DMA withηof 300 or 4300 mPa.sec played an important role with the increase of Wp,whereas the charge neutralization of them was weaker with the increase of Wp.There was interaction between Wp and B on the removal of reactive dye.The composite flocculant with intermediate viscosity and organic content was effective for the treatment of reactive dyeing wastewater,which could achieve high reactive dye removal efficiency with low organic dosage. 展开更多
关键词 composite flocculant reactive dye removal flocculation mechanism decolorization efficiency
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Performance of dithiocarbamate-type flocculant in treating simulated polymer flooding produced water 认领 引用 被引量：19
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作者 Baoyu Gao Yuyan Jia +2 位作者 Yongqiang Zhang Qian Li Qinyan Yue 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2011年第1期37-43,共7页
Produced water from polymer flooding is difficult to treat due to its high polymer concentration,high viscosity,and emulsified characteristics.The dithiocarbamate flocculant,DTC(T403),was prepared by the amine-termina... Produced water from polymer flooding is difficult to treat due to its high polymer concentration,high viscosity,and emulsified characteristics.The dithiocarbamate flocculant,DTC(T403),was prepared by the amine-terminated polyoxypropane-effier compound known as Jeffamine-T403.The product was characterized by IR spectra and elemental analysis.The DTC agent chelating with Fe2+produced a network polymer matrix,which captured and removed oil droplets efficiently.Oil removal by the flocculent on simulated produced water with 0,200,500,900 mg/L of partially hydrolyzed polyacrylamide(HPAM)was investigated for aspects of effectiveness of DTC(T403)dosage and concentrations of HPAM and Fe2+ions in the wastewater.Results showed that HPAM had a negative influence on oil removal efficiency when DTC(T403)dosage was lower than 20 mg/L.However,residual oil concentrations in tested samples with different concentrations of HPAM all decreased below 10 mg/L when DTC(T403)dosage reached 30 mg/L.The concentration of Fe2+in the initial wastewater had a slight effect on oil removal at the range of 2-12 mg/L.Results showed that Fe3+could not be used in place of Fe2+as Fe3+could not react with DTC under flocculated conditions.The effects of mineral salts ions were also investigated. 展开更多
关键词 dithiocarbamate flocculation hydrolyzed polyacrylamide oil removal
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Fractionation of residual Al in natural water treatment from reservoir with poly-aluminum-silicate-chloride (PASiC): Effect of OH/Al, Si/Al molar ratios and initial pH 认领 引用 被引量：8
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作者 Zhonglian Yang Baoyu Gao +2 位作者 Yan Wang Yaqin Zhao Qinyan Yue 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第11期1908-1916,共9页
An aluminum fractionation study was conducted for a surface reservoir water treatment to understand the performance of poly- aluminum-silicate-chloride （PASiC） in terms of the residual A1 fractions as a function of ... An aluminum fractionation study was conducted for a surface reservoir water treatment to understand the performance of poly- aluminum-silicate-chloride （PASiC） in terms of the residual A1 fractions as a function of initial pH. The coagulation performance expressed as turbidity and organic matter removal was established as supporting data. Some extra data were evaluated in terms of the residual A1 ratio of the composite PASiC coagulant. The main residual A1 sources were the A1 fractions derived from the use of PASiC. The turbidity and organic matter removal ability was optimal at initial pH 6.00-7.00, while the concentrations of various residual A1 species and the residual A1 ratio of PASiC were minimal at an initial pH range of 7.00-8.00. Under the conditions of OH/AI molar ratio = 2.00 and Si/A1 molar ratio = 0.05, PASiC had superior coagulation performance and comparatively low residual A1 concentrations. The A1 fraction in the composite PASiC coagulant seldom remained under such conditions. Experimental data also indicated that the suspended （filterable） AI fraction was the dominant species, and organic-bound or organo-A1 complex A1 was considered to be the major species of dissolved A1 in water treated by PASiC coagulation. Additionally, the dissolved inorganic monomeric A1 species dominated the dissolved monomeric A1 fraction. 展开更多
关键词 coagulation performance OH/A1 and Si/AI molar ratio poly-aluminum-silicate-chloride （PAniC） resi0ual AI speclataon residual A1 ratio
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Polytitanium sulfate(PTS):Coagulation application and Ti species detection 认领 引用 被引量：4
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作者 Yanxia Zhao Sherub Phuntsho +1 位作者 Baoyu Gao Hokyong Shon 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第2期250-258,共9页
Interest in the development of inorganic polymerized coagulants is growing; however, there are only limited studies on the synthesis of polytitanium coagulants, which are expected to exhibit improved coagulation effic... Interest in the development of inorganic polymerized coagulants is growing; however, there are only limited studies on the synthesis of polytitanium coagulants, which are expected to exhibit improved coagulation efficiency with better floc properties. This study presents the synthesis of polytitanium sulfate（PTS） for potential application in water purification,followed by characterization of PTS flocs and titanium species detection. Stable PTS solutions were successfully synthesized and standard jar tests were conducted to evaluate their coagulation efficiency. Electrospray ionization time-of-flight mass spectrometry（ESI-TOF-MS） speciation analysis revealed that a variety of mononuclear and polynuclear complexes were formed in PTS solution, indicating the polymeric nature of the synthesized coagulant. Floc characteristics were studied through on-line monitoring of floc size using a laser diffraction particle size analyzer. Results showed that PTS had a comparable or in some cases even higher organic matter and particulate removal efficiency than Ti（SO4）2.The effluent p H after PTS coagulation significantly improved toward desirable values closer to neutral p H. Properties of flocs formed by PTS were significantly improved in terms of floc size, growth rate and structure. This study showed that PTS could be an efficient and promising coagulant for water purification, with the additional benefit that its coagulated sludge can be used to recover valuable TiO2 nanoparticles for various commercial applications. 展开更多
关键词 Polytitanium sulfate Coagulation and flocculation Titanium species Floc properties
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Facile one-step synthesis of functionalized biochar from sustainable prolifera-green-tide source for enhanced adsorption of copper ions 认领 引用 被引量：4
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作者 Yuan Gao Xiuzhen Zhu +1 位作者 Qinyan Yue Baoyu Gao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第11期185-194,共10页
The use of biochars formed by hydrothermal carbonization for the treatment of contaminated water has been greatly limited, due to their poorly developed porosity and low content of surface functional groups. Also, the... The use of biochars formed by hydrothermal carbonization for the treatment of contaminated water has been greatly limited, due to their poorly developed porosity and low content of surface functional groups. Also, the most common modification routes inevitably require post-treatment processes, which are time-consuming and energy-wasting. Hence, the objective of this research was to produce a cost-effective biochar with improved performance for the treatment of heavy metal pollution through a facile one-step hydrothermal carbonization process coupled with ammonium phosphate, thiocarbamide, ammonium chloride or urea, without any posttreatment. The effects of various operational parameters, including type of modification reagent, time and temperature of hydrothermal treatment, and ratio of modification reagent to precursor during impregnation, on the copper ion adsorption were examined. The adsorption data fit the Langmuir adsorption isotherm model quite well. The maximum adsorption capacities （mg/g） of the biochars towards copper ions followed the order of 40-8h-1.0-APBC （95.24） 〉 140-Sh-O-BC （12.52） 〉 140-8h-1.0-TUBC （12.08） 〉 140-Sh-1.0-ACBC （7.440） 〉 140-Sh-1.0-URBC （5.277）. The results indicated that biochars modified with ammonium phosphate displayed excellent adsorption performance toward copper ions, which was 7.6-fold higher than that of the pristine biochar. EDX and FT-IR analyses before and after adsorption demonstrated that the main removal mechanism involved complexation between the phosphate groups on the surface of the modified biochars and copper ions. 展开更多
关键词 Hydrothermal carbonization Functionalized biochar Adsorption Heavy metal
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Coagulation behavior and floc properties of compound bioflocculant–polyaluminum chloride dual-coagulants and polymeric aluminum in low temperature surface water treatment 认领 引用 被引量：13
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作者 Xin Huang Shenglei Sun +3 位作者 Baoyu Gao Qinyan Yue Yan Wang Qian Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第4期215-222,共8页
This study was intended to compare coagulation behavior and floc properties of two dualcoagulants polyaluminum chloride–compound bioflocculant（PAC–CBF）（PAC dose first） and compound bioflocculant–polyaluminum ch... This study was intended to compare coagulation behavior and floc properties of two dualcoagulants polyaluminum chloride–compound bioflocculant（PAC–CBF）（PAC dose first） and compound bioflocculant–polyaluminum chloride（CBF–PAC）（CBF dose first） with those of PAC alone in low temperature drinking water treatment. Results showed that dualcoagulants could improve DOC removal efficiency from 30% up to 34%. Moreover, CBF contributed to the increase of floc size and growth rate, especially those of PAC–CBF were almost twice bigger than those of PAC. However, dual-coagulants formed looser and weaker flocs with lower breakage factors in which fractal dimension of PAC–CBF flocs was low which indicates a looser floc structure. The floc recovery ability was in the following order：PAC–CBF 〉 PAC alone 〉 CBF–PAC. The flocculation mechanism of PAC was charge neutralization and enmeshment, meanwhile the negatively charged CBF added absorption and bridging effect. 展开更多
关键词 Coagulation behavior Floc properties Dual-coagulants Surface water
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Fatty acid fouling of forward osmosis membrane:Effects of pH,calcium,membrane orientation,initial permeate flux and foulant composition 认领 引用 被引量：4
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作者 Pin Zhao Baoyu Gao +2 位作者 Qinyan Yue Pan Liu Ho Kyong Shon 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第8期55-62,共8页
Octanoic acid（OA） was selected to represent fatty acids in effluent organic matter（EOM）. The effects of feed solution（FS） properties, membrane orientation and initial permeate flux on OA fouling in forward osmo... Octanoic acid（OA） was selected to represent fatty acids in effluent organic matter（EOM）. The effects of feed solution（FS） properties, membrane orientation and initial permeate flux on OA fouling in forward osmosis（FO） were investigated. The undissociated OA formed a cake layer quickly and caused the water flux to decline significantly in the initial 0.5 hr at unadjusted p H 3.56; while the fully dissociated OA behaved as an anionic surfactant and promoted the water permeation at an elevated p H of 9.00. Moreover, except at the initial stage, the sudden decline of water flux（meaning the occurrence of severe membrane fouling） occurred in two conditions： 1.0.5 mmol/L Ca2＋, active layer facing draw solution（AL-DS） and 1.5 mol/L Na Cl（DS）; 2. No Ca2＋,active layer-facing FS（AL-FS） and 4 mol/L Na Cl（DS）. This demonstrated that cake layer compaction or pore blocking occurred only when enough foulants were absorbed into the membrane surface, and the water permeation was high enough to compact the deposit inside the porous substrate. Furthermore, bovine serum albumin（BSA） was selected as a co-foulant.The water flux of both co-foulants was between the fluxes obtained separately for the two foulants at p H 3.56, and larger than the two values at p H 9.00. This manifested that, at p H 3.56,BSA alleviated the effect of the cake layer caused by OA, and OA enhanced BSA fouling simultaneously; while at p H 9.00, the mutual effects of OA and BSA eased the membrane fouling. 展开更多
关键词 Forward osmosis Membrane fouling Octanoic acid Water flux Reverse solute flux
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Purification,characterization and application of dual coagulants containing chitosan and different Al species in coagulation and ultrafiltration process 认领 引用 被引量：4
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作者 Wenyu Wang Shuang Zhao +3 位作者 Qinyan Yue Baoyu Gao Wen Song Lijuan Feng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第1期214-221,共8页
The objective of this study was to investigate the effect of different Al species and chitosan（CS） dosages on coagulation performance,floc characteristics（floc sizes,strength and regrowth ability and fractal dimens... The objective of this study was to investigate the effect of different Al species and chitosan（CS） dosages on coagulation performance,floc characteristics（floc sizes,strength and regrowth ability and fractal dimension） and membrane resistance in a coagulation-ultrafiltration hybrid process.Results showed that different Al species combined with humic acid in diverse ways.A1_a had better removal efficiency,as determined by UV_（254） and dissolved organic carbon,which could be further improved by the addition of CS.In addition,the optimal dosage of different Al species was determined to be 4.0 mg/L with the CS concentration of 1.0 mg/L,by orthogonal coagulation experiments.Combining Al_a/A1_b/A1_c,with CS resulted in larger flocs,higher recovery,and higher fractal dimension values corresponding to denser flocs;in particular,the floc size at the steady state stage was four times larger than that obtained with Al species coagulants alone.The results of ultrafiltration experiments indicated that the external fouling percentage was significantly higher than that of internal fouling,at around 85%and 15%,respectively.In addition,the total membrane resistance was significantly decreased due to CS addition. 展开更多
关键词 Al species Chitosan Dual-coagulants Coagulation-ultrafiltration Floc-characteristics Membrane resistance
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Insights into properties of activated carbons prepared from different raw precursors by pyrophosphoric acid activation 认领 引用
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作者 Yuan Gao Qinyan Yue Baoyu Gao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第3期235-243,共9页
Low-cost activated carbons（ACs） were prepared from four kinds of solid wastes：petroleum coke,Enteromorpha prolifera,lignin from papermaking black liquid and hair,by pyrophosphoric acid（H_4P_2O_7） activation.Therm... Low-cost activated carbons（ACs） were prepared from four kinds of solid wastes：petroleum coke,Enteromorpha prolifera,lignin from papermaking black liquid and hair,by pyrophosphoric acid（H_4P_2O_7） activation.Thermo-gravimetric analysis of the pyrolysis of H_4P_2O_7-precursor mixtures implied that H_4P_2O_7 had different influences on the pyrolysis behavior of the four raw materials.N_2 adsorption/desorption isotherms,scanning electron microscopy,Fourier transform infrared spectroscopy and adsorption capacities for dyes were used to characterize the prepared activated carbons.AC derived from E.prolifera exhibited the highest surface area（1094 m^2/g） and maximum monolayer adsorption capacity for malachite green（1250 mg/g）.Kinetic studies showed that the experimental data were in agreement with the pseudo-second-order model.The adsorption isotherms were well described by the Langmuir isotherm model,indicating the adsorption of dye onto the ACs proceeded by monolayers. 展开更多
关键词 Solid waste Pyrophosphoric acid Low-cost adsorbent Dye Adsorption
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Performance of bimetallic nanoscale zero-valent iron particles for removal of oxytetracycline 认领 引用 被引量：12
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作者 Yuwei Wu Qinyan Yue +2 位作者 Yuan Gao Zhongfei Ren Baoyu Gao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第7期173-182,共10页
In this study, bimetallic nanoscale zero-valent iron particles（nZVI）, including copperanoscale zero-valent iron particles（CuZVI） and nickelanoscale zero-valent iron particles（NiZVI）, were synthesized by one-step... In this study, bimetallic nanoscale zero-valent iron particles（nZVI）, including copperanoscale zero-valent iron particles（CuZVI） and nickelanoscale zero-valent iron particles（NiZVI）, were synthesized by one-step liquid-phase reduction and applied for oxytetracycline（OTC） removal. The effects of contact time and initial p H on the removal efficiency were studied. The as-prepared nanoscale particles were characterized by scanning electron microscopy（SEM）, energy dispersive spectroscopy（EDS） and X-ray diffraction（XRD）. Finally, the degradation mechanisms of OTC utilizing the as-prepared nanoparticles were investigated by using X-ray photoelectron spectroscopy（XPS） and mass spectrometry（MS）. Cu ZVI presented remarkable ability for OTC degradation and removed71.44% of OTC（100 mg/L） in 4 hr, while only 62.34% and 31.05% of OTC was degraded by NiZVI and nZVI respectively. XPS and MS analysis suggested that OTC was broken down to form small molecules by ·OH radicals generated from the corrosion of Fe0. CuZVI and Ni ZVI have been proved to have potential as materials for application in OTC removal because of their significant degradation ability toward OTC. 展开更多
关键词 Bimetallic nanoscale zero-valent iron particles Oxytetracycline Degradation mechanism Hydroxyl radicals
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Characterization of dissolved organic matter and membrane fouling in coagulation-ultrafiltration process treating micro-polluted surface water 认领 引用 被引量：6
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作者 Fan Bu Baoyu Gao +2 位作者 Qinyan Yue Xue Shen Wenyu Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2019年第1期318-324,共7页
Coagulation–ultrafiltration(C–UF) is widely used for surface water treatment. With the removal of pollutants, the characteristics of organic matter change and affect the final treatment efficiency and the developmen... Coagulation–ultrafiltration(C–UF) is widely used for surface water treatment. With the removal of pollutants, the characteristics of organic matter change and affect the final treatment efficiency and the development of membrane fouling. In this study, we built a dynamic C–UF set-up to carry out the treatment of micro-polluted surface water, to investigate the characteristics of dissolved organic matter from different units. The influences of poly aluminum chloride and poly dimethyldiallylammonium chloride(PDMDAAC) on removal efficiency and membrane fouling were also investigated. Results showed that the dosage of PDMDAAC evidently increased the UV254 and dissolved organic carbon removal efficiencies,and thereby alleviated membrane fouling in the C–UF process. Most hydrophobic bases(HoB)and hydrophobic neutral fractions could be removed by coagulation. Similarly, UF was good at removing HoB compared to hydrophilic substances(HiS) and hydrophobic acid(HoA)fractions. HiS and HoA fractions with low molecule weight accumulated on the surface of the membrane, causing the increase of transmembrane pressure(TMP). Membrane fouling was mainly caused by a removable cake layer, and mechanical cleaning was an efficient way to decrease the TMP. 展开更多
关键词 Coagulation Ultrafiltration Dissolved organic matter Membrane fouling
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Adsorptive removal of phosphate by the bimetallic hydroxide nanocomposites embedded in pomegranate peel 认领 引用 被引量：8
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作者 Muhammad Akram Xing Xu +4 位作者 Baoyu Gao Qinyan Yue Shang Yanan Rizwan Khan Muhammad Ali Inam 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期189-198,共10页
This study aimed to fabricate new and effective material for the efficiency of phosphate adsorption.Two types of adsorbent materials,the zirconium hydroxides embedded in pomegranate peel(Zr/Peel)and zirconium-lanthanu... This study aimed to fabricate new and effective material for the efficiency of phosphate adsorption.Two types of adsorbent materials,the zirconium hydroxides embedded in pomegranate peel(Zr/Peel)and zirconium-lanthanum hydroxides embedded in pomegranate peel(Zr-La/Peel)were developed.Scanning electronic microscopy(SEM),x-ray photoelectron spectroscopy(XPS)and x-ray diffraction(XRD)were evaluated to give insight into the physicochemical properties of these adsorbents.Zr-La/Peel exceeded the adsorption efficiency of Zr/Peel adsorbents in batch adsorption experiments at the same pH level.The peel as a host can strive to have a strong"shielding effect"to increase the steadiness of the entrenched Zr and La elements.La and Zr are hydroxide metals that emit many hydrogen ions during the hydrolysis reaction,which contribute to protonation and electrostatic attraction.The highest adsorption capacity of La-Zr/Peel for phosphate was calculated to be40.21 mg/g,and pseudo second-order equation is very well fitted for kinetic adsorption.Phosphate adsorption efficiency was reduced by an increase of pH.With the background of coexisting Cl-,little effect on adsorption efficiency was observed,while adsorption capacities were reduced by almost 20-30%with the coexistence of SO42-,NO3-and humic acid(HA). 展开更多
关键词 Bimetallic hydroxides Pomegranate peel Phosphate Adsorption
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Synchronous removal of CuO nanoparticles and Cu2+ by polyaluminum chloride-Enteromorpha polysaccharides: Effect of Al species and pH 认领 引用 被引量：4
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作者 Yuanxia Luo Baoyu Gao +1 位作者 Jie Wang Qinyan Yue 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第2期1-11,共11页
Copper oxide nanomaterials have been extensively applied and can have serious impacts when discharged into the aquatic environment, especially when complexed with humic acid(HA) to form composite contaminants.As an in... Copper oxide nanomaterials have been extensively applied and can have serious impacts when discharged into the aquatic environment, especially when complexed with humic acid(HA) to form composite contaminants.As an innovative recycled coagulant aid,Enteromorpha polysaccharides(Ep) were associated with polyaluminum chloride(PACl)(denoted as PACl-Ep) to simultaneously remove CuO nanoparticles, Cu2+and HA in this study.The influence of different Al species coagulants(AlCl3, PAClb and PAClc) and water pH on coagulation performance, floc properties and reaction mechanisms was investigated in detail.Results showed that in the three PACl-Ep systems, PAClb-Ep gave the highest removal efficiencies for turbidity and Cu2+, and the best UV254 removal effect was reached by using PAClc-Ep.Higher contents of Alb and Alc contributed to great coagulation performance because of their stronger bridging and sweeping effects.For all the Al species coagulants, alkalescent conditions were more conducive to removing Cu and HA compared to acidic conditions.Additionally, smaller and more agminated flocs with great recovery ability were formed by PAClb-Ep and PAClc-Ep systems(bridging and enmeshment effects cooperated with the chelated reticular structure formed by the Ep and Al species).Similarly,due to the increased hydrolysis and hydroxide precipitates, flocs formed under the condition of alkalescence were smaller, denser and stronger compared with weakly acidic conditions. 展开更多
关键词 Al species Enteromorpha polysaccharides Polyaluminum chloride 27Al nuclear magnetic resonance Simultaneous removal
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Advanced lignin-acrylamide water treatment agent by pulp and paper industrial sludge: Synthesis, properties and application 认领 引用 被引量：4
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作者 Hongyan Rong Baoyu Gao +5 位作者 Yanxia Zhao Shenglei Sun Zhonglian Yang Yan Wang Qinyan Yue Qian Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第12期2367-2377,共11页
A novel flocculant LA （lignin-acrylamide polymer）, which was used as aid for aluminum sulfate and polyaluminum chloride in this study, was prepared by grafting acrylamide onto lignin that deriving from pulp and pape... A novel flocculant LA （lignin-acrylamide polymer）, which was used as aid for aluminum sulfate and polyaluminum chloride in this study, was prepared by grafting acrylamide onto lignin that deriving from pulp and papermaking sludge. Physicochemical properties of LA were measured by X-ray photoelectron spectroscopy and scanning electron microscopy. The experimental outcome indicated acrylamide was grafted onto the lignin backbone successfully. The effects of LA addition were evaluated on coagulation performance and floc characteristics as a function of aluminum （Al） dosage, such as floc size, growth rate, strength and recoverability. Effects of different dosing sequences, Al dosed first and LA dosed first, were also investigated. LA used as coagulant aid markedly enhanced the removal efficiency of turbidity and dissolved organic carbon, especially at low Al dosages. The dissolved organic carbon removal efficiencies of aluminum sulfate and polyaluminum chloride at the Al dosage range selected in this study were improved more than 30% and 5% by LA, respectively. LA dramatically enlarged floc size and it was in the order： Al dosed first 〉 LA dosed first 〉 Al. Floc strength and recoverability were also improved by LA. LA played a significant role in charge neutralization, adsorption and bridging in floc formation. 展开更多
关键词 pulp and paper industrial sludge graft copolymerization aluminum sulfate polyaluminum chloride floc characteristics
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Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures 认领 引用 被引量：21
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作者 Xiaochen Li Baoyu Gao +4 位作者 Qinyan Yue Defang Ma Hongyan Rong Pin Zhao Pengyou Teng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第3期124-130,共7页
Precipitation of calcium carbonate （CaCOs） scale on heat transfer surfaces is a serious and expensive problem widely occurring in numerous industrial processes. In this study, we compared the scale inhibition effect... Precipitation of calcium carbonate （CaCOs） scale on heat transfer surfaces is a serious and expensive problem widely occurring in numerous industrial processes. In this study, we compared the scale inhibition effect of six kinds of commercial scale inhibitors and screened out the best one （scale inhibitor SQ-1211） to investigate its scale inhibition performance in highly saline conditions at high temperature through static scale inhibition tests. The influences of scale inhibitor dosage, temperature, heating time and pH on the inhibition efficiency of the optimal scale inhibitor were investigated. The morphologies and crystal structures of the precipitates were characterized by Scanning Electron Microscopy and X-ray Diffraction analysis. Results showed that the scale inhibition efficiency of the optimal scale inhibitor decreased with the increase of the reaction temperature. When the concentration of Ca^2＋ was 1600 mg/L, the scale inhibition rate could reach 90.7% at 80℃ at pH 8. The optimal scale inhibitor could effectively retard scaling at high temperature. In the presence of the optimal scale inhibitor, the main crystal structure of CaCOs changed from calcite to aragonite. 展开更多
关键词 Scale inhibitor Scale inhibition efficiency High salinity High temperature Grystal growth
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Aluminum formate(AF): Synthesis, characterization and application in dye wastewater treatment 认领 引用 被引量：3
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作者 Moxi Xue Baoyu Gao +1 位作者 Ruihua Li Jianzhang Sun 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第12期95-106,共12页
Aluminum formate（AF）, a degradable and non-corrosive coagulant, was synthesized from aluminum hydroxide and formic acid. Polyamidine（PA）, as a coagulation aid, was combined with AF for dye wastewater treatment. AF... Aluminum formate（AF）, a degradable and non-corrosive coagulant, was synthesized from aluminum hydroxide and formic acid. Polyamidine（PA）, as a coagulation aid, was combined with AF for dye wastewater treatment. AF was characterized by XPS, FT-IR, viscosity, zeta potential, mass spectrum and XRD, and the flocculation properties of the dual-coagulation system were characterized by FT-IR and SEM. The results showed that COOH, Al2 O3-Al and O2-Al bonds were formed in the AF synthesis process, and AF had a higher molecular weight and higher charge neutralization ability than PAC. The hydrolysates of AF were determined to contain Al（13）Al（11） and Al2, and the components of AF were confirmed to comprise a mixture including aluminum formate（C3H3AlO6） and its hydrate. When the color removal efficiency reached 100% in jar tests, the optimized dosage of AF/PA was 18.91/0.71 mg/L,while the optimized dosage of PAC/PA was 21.19/0.91 mg/L. According to the variance analysis, the interaction between AF/PA and PAC/PA were insignificant in macroscopic view. FT-IR spectrum indicated AF captured pollutant by means of CCO bond, PAC captured pollutant by δ CH, ／CC／ and δ CH. Overall, although the coagulation mechanism of AF was different from that of PAC, AF/PA showed better coagulation efficiency than PAC/PA in dye wastewater treatment. 展开更多
关键词 Aluminum formate Polyamidine Dual-coagulation Phase analysis Interaction
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Novel cationic polyamidine:Synthesis,characterization,and sludge dewatering performance 认领 引用 被引量：10
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作者 Bo Guo Huan Yu +3 位作者 Baoyu Gao Sen Zhang Qinyan Yue Xing Xu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第1期305-314,共10页
In this study,a new and facile route was employed for synthesis of polyamidine with abundant cations and attractive five-membered ringlike structural unit.N-vinylformamide and acrylonitrile copolymerized firstly to fo... In this study,a new and facile route was employed for synthesis of polyamidine with abundant cations and attractive five-membered ringlike structural unit.N-vinylformamide and acrylonitrile copolymerized firstly to form intermediates,and the intermediates were processed with hydrochloric acid to produce polyamidine.A series of polymerization conditions（e.g.polymerization time,temperature and dosage of initiator） were optimized through productivity,viscosity and cationic degree as evaluation.SEM analysis illustrated that the amidinization process could reduce the size of spaces between molecular and created compact structure,which would contribute to good flocculation performance and high viscosity.FT-IR,XPS and NMR spectra presented a rather clear structure of polyamidine.34.3%of sludge was sedimentated through the flocculation of polyamidine in the early stages.In contrast,only 6.8%of sludge was sedimentated by polyacrylamide.The moisture content in dehydrated floc could be reduced to 77.7%when 60 mg/L polyamidine was added.These results demonstrated that the polyamidine showed a great potential in the practical application of sludge dewatering. 展开更多
关键词 Polyamidine Synthesis Characterization Sludge dewatering
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