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Artificial Neural Network and Full Factorial Design Assisted AT-MRAM on Fe Oxides,Organic Materials,and Fe/Mn Oxides in Surficial Sediments 认领 引用 被引量：1
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作者 GAO Qian WANG Zhi-zeng +2 位作者 WANG Qian LI Shan-shan LI Yu 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2011年第6期944-948,共5页
Artificial neural network(ANN)and full factorial design assisted atrazine(AT)multiple regression adsorption model(AT-MRAM)were developed to analyze the adsorption capability of the main components in the surficial sed... Artificial neural network(ANN)and full factorial design assisted atrazine(AT)multiple regression adsorption model(AT-MRAM)were developed to analyze the adsorption capability of the main components in the surficial sediments(SSs).Artificial neural network was used to build a model(the determination coefficient square r2 is 0.9977)to describe the process of atrazine adsorption onto SSs,and then to predict responses of the full factorial design.Based on the results of the full factorial design,the interactions of the main components in SSs on AT adsorption were investigated through the analysis of variance(ANOVA),F-test and t-test.The adsorption capability of the main components in SSs for AT was calculated via a multiple regression adsorption model(MRAM).The results show that the greatest contribution to the adsorption of AT on a molar basis was attributed to Fe/Mn(–1.993μmol/mol).Organic materials(OMs)and Fe oxides in SSs are the important adsorption sites for AT,and the adsorption capabilities are 1.944 and 0.418μmol/mol,respectively.The interaction among the non-residual components(Fe,Mn oxides and OMs)in SSs interferes in the adsorption of AT that shouldn’t be neglected,revealing the significant contribution of the interaction among non-residual components to controlling the behavior of AT in aquatic environments. 展开更多
关键词 Back propagation(BP)artificial neural network Full factorial design Fe/Mn oxide Organic material Atrazine Interaction
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Accelerated activation of ozone on Fe-doped MnO2for highly efficient ozone catalytic oxidation of ethyl acetate 认领 引用 被引量：1
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作者 Ning Wu Ming Ouyang +7 位作者 Lei Liu Chuying Qiu Ning Wang Peirong Chen Junliang Wu Xiaofei Song Mingli Fu Daiqi Ye 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期638-646,共9页
Ozone catalytic oxidation(OCO)is a promising technology for controlling malodorous pollution,effectively removing low-concentration oxygenated volatile organic compounds(OVOCs)at low temperatures.However,the catalytic... Ozone catalytic oxidation(OCO)is a promising technology for controlling malodorous pollution,effectively removing low-concentration oxygenated volatile organic compounds(OVOCs)at low temperatures.However,the catalytic performance of manganese oxides remains constrained by insufficient reactive oxygen species(ROS)and high humidity,particularly at low temperatures.To address this,a series of MMnO2catalysts were successfully prepared by introducing highly dispersed transition metals(M=Fe,Ce,Mo)into MnO2via an in-situ hydrothermal method,aiming to improve low-temperature performance.Among these catalysts,the FeMnO2catalyst exhibited the highest catalytic performance,achieving 100%conversion of 30 ppm ethyl acetate(EA)and a 92.78%mineralization rate at 70℃,along with exceptional stability and water resistance(12.8 vol.%).In situ characterization techniques have demonstrated that the introduction of Fe significantly weakens the Mn-O bond in MnO2.The formation of abundant oxygen vacancies facilitates the adsorption and activation of O3.Both 1O2and·O2-species serve as crucial ROS,promoting the effective mineralization of EA on the catalyst surface and reducing the generation of reaction intermediates.This study provides a significant foundation for the further development of catalysts targeting low-concentration OVOCs and for enhancing the practical low-temperature catalytic activity of transition metal oxides. 展开更多
关键词 Ozone catalytic oxidation Fe doping Oxygen vacancies Reactive oxygen species Ethyl acetate
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Simultaneous immobilization of multiple heavy metal(loid)s in contaminated water and alkaline soil inoculated Fe/Mn oxidizing bacterium 认领 引用 被引量：2
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作者 Yi Wu Shengli Wang +5 位作者 Jun Xu Fei Zang Song Long Yining Wu Yuqing Wang Zhongren Nan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第1期370-381,共12页
Two strains of Fe/Mn oxidizing bacteria tolerant to high concentrations of multiple heavy metal(loid)s and efficient decontamination for them were screened.The surface of the bio-Fe/Mn oxides produced by the oxidation... Two strains of Fe/Mn oxidizing bacteria tolerant to high concentrations of multiple heavy metal(loid)s and efficient decontamination for them were screened.The surface of the bio-Fe/Mn oxides produced by the oxidation of Fe(II)and Mn(II)by Pseudomonas taiwanensis(marked as P4)and Pseudomonas plecoglossicida(marked as G1)contains rich reactive oxygen functional groups,which play critical roles in the removal efficiency and immobilization of heavymetal(loid)s in co-contamination system.The isolated strains P4 and G1 can growwell in the following environments:pH 5-9,NaCl 0-4%,and temperature 20-30℃.The removal efficiencies of Fe,Pb,As,Zn,Cd,Cu,and Mn are effective after inoculation of the strains P4 and G1 in the simulated water system(the initial concentrations of heavy metal(loid)were 1 mg/L),approximately reaching 96%,92%,85%,67%,70%,54%and 15%,respectively.The exchangeable and carbonate bound As,Cd,Pb and Cu are more inclined to convert to the Fe-Mn oxide bound fractions in P4 and G1 treated soil,thereby reducing the phytoavailability and bioaccessible of heavy metal(loid)s.This research provides alternatives method to treat water and soil containing high concentrations of multi-heavy metal(loid)s. 展开更多
关键词 Bio-Fe/Mn oxides Pseudomonas Heavy metal(loid)s Removal and immobilization
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Re-evaluating the role of iron and manganese oxides in thallium retention:Insights from laboratory adsorption and soil pot experiments 认领 引用
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作者 Xian’an Yu Yifan Guan +9 位作者 Jing Wei Pengjie Hu Jiawen Zhou Tong Zhou Zhu Li Tangfu Xiao Juan Liu Yongming Luo Peter Christie Longhua Wu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期751-760,共10页
Iron(Fe)and manganese(Mn)oxides play a crucial role in thallium(Tl)retention.However,the specific roles they play in this process remain unclear.Here,Fe oxides(goethite/hematite),Mn oxides(birnessite/MnO2),and Fe-M... Iron(Fe)and manganese(Mn)oxides play a crucial role in thallium(Tl)retention.However,the specific roles they play in this process remain unclear.Here,Fe oxides(goethite/hematite),Mn oxides(birnessite/MnO2),and Fe-Mn binary oxides(Goe-MnOx/Hem-MnOx)were synthesized and used in single and mixed adsorption systems.Goethite and birnessite were then selected as amendments for the Lactuca sativa pot experiment.Results showed that Mn oxides exhibited higher adsorption capacity for Tl(Ⅰ)than Fe-Mn binary oxides or Fe oxides.Adsorption energies calculated by density-functional-theory(DFT)further confirm the stronger affinity of birnessite for Tl(Ⅰ).In mixed systems,as the mass ratio of birnessite-to-goethite/hematite increased from 1:0 to 1:200,Tl(Ⅰ)adsorption capacities of the mixture decreased significantly by 65.5%and 76.9%.X-ray photoelectron spectroscopy analysis confirmed the oxidative uptake of Tl(Ⅰ)by birnessite.Additionally,the distribution of Fe associated with the Mn phase collected by transmission electron microscopy-energy dispersive X-ray spectroscopy(TEM-EDS)indicated its inhibitory effect during the Tl(Ⅰ)retention process by Mn(Ⅳ)oxides.Furthermore,in the pot experiment,goethite showed no discernible effect on lettuce growth or Tl uptake.In contrast,birnessite significantly lowered shoot Tl concentrations(84.7%-94.4%)and this was associated with the changes in the speciation of soil Mn and Tl as revealed by principal-component-analysis(PCA)and correlation analysis.This study clarifies the role of Fe/Mn oxides in the environmental behavior of Tl,offering valuable implications for the development of effective remediation strategies and ensuring safe crop production in Tl-contaminated soils. 展开更多
关键词 Fe/Mn oxides Thallium Adsorption mechanism Pot experiment Lactuca sativa
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Different natural iron-bearing minerals activated peroxymonosulfate for in-situ chemical oxidation process:Insights into the active Fe sites and activation mechanism 认领 引用
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作者 Jinyan Yang Ying Chen +5 位作者 Minghan Yu Lan Zhu Yilin Wang Jingsong Chen Hui Ma Shengyan Pu 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第7期343-351,共9页
In situ chemical oxidation(ISCO)technology using peroxymonosulfate(PMS)and natural iron-bearing minerals for groundwater remediation has received increasing interest.The interaction between PMS and active Fe sites in ... In situ chemical oxidation(ISCO)technology using peroxymonosulfate(PMS)and natural iron-bearing minerals for groundwater remediation has received increasing interest.The interaction between PMS and active Fe sites in minerals significantly influences the effectiveness of groundwater remediation.Nevertheless,there has been limited research investigating the relationship between the minerals active Fe sites and PMS activation.Herein,we distinguished and quantified the active Fe sites of common natural iron-bearing minerals in groundwater aquifers.Lewis acid sites(Fe-OH)were confirmed as the reaction sites in iron oxide/hydroxide/bearing clay minerals.The activation performance of minerals is positively correlated with their Lewis acid content.In iron sulfide minerals,Fe-S sites act as electron transfer mediators,facilitating PMS adsorption and activation.The activation of PMS by Lewis acid and Fe-S sites free radical both led to the generation of free radicals(SO4·-and·OH)for CPs removal.Moreover,typical ferrihydrite/PMS and pyrite/PMS systems exhibited resistance to environmental interference and broad pH adaptability.A one-dimensional sand column experiment further proved their feasibility and long-term applicability in saturated porous media.These findings highlight the critical influence of active Fe sites of natural iron-bearing minerals and provide technical support for the application of PMS-ISCO strategies for groundwater remediation. 展开更多
关键词 Groundwater remediation In situ chemical oxidation Natural iron-bearing minerals Peroxymonosulfate activation Active Fe sites
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Cu-Fe-Mn层状氧化物钠离子电池正极材料前驱体的共沉淀制备及其电化学性能 认领 引用
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作者 艾常春 张弓 +3 位作者 王梓涵 李芳欣 杨之胺 薛永萍 《天津工业大学学报》 CAS 北大核心 2026年第2期59-66,共8页
为克服传统固相合成法缺点,采用氨碱法和草酸盐共沉淀法分别制备了Cu-Fe-Mn系钠离子电池正极材料前驱体,并采用不同前驱体制备O3型Na0.9[Cu0.22Fe0.30Mn0.48]O2正极材料,对不同方法制备的前驱体及其正极材料的形貌结构... 为克服传统固相合成法缺点,采用氨碱法和草酸盐共沉淀法分别制备了Cu-Fe-Mn系钠离子电池正极材料前驱体,并采用不同前驱体制备O3型Na0.9[Cu0.22Fe0.30Mn0.48]O2正极材料,对不同方法制备的前驱体及其正极材料的形貌结构和电化学性能进行分析。结果表明:2种不同方法制备的前驱体一次颗粒粒径均为100~200 nm,且分布均匀;以2种前驱体为原料制备的层状氧化物材料均为片状结晶,其中氨碱法制备所得层状氧化物粒径约为2μm,草酸盐沉淀法所得正极材料粒径约为5~6μm;二者晶体结构均为O3型层状结构,钠层间距分别为0.33329 nm和0.32734 nm;在0.1 C倍率下,氨碱法和草酸盐沉淀法所得氧化物的首圈放电比容量分别为90.50、90.04 mA·h/g,50圈后的比容量分别为89.26和80.92 mA·h/g,容量保持率分别为98.63%和89.87%。 展开更多
关键词 共沉淀法 Cu-Fe-Mn层状氧化物前驱体 电化学性能 钠离子电池
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三维Fe/Mn双金属有机框架的制备及吸附-活化过硫酸盐去除四环素的性能 认领 引用
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作者 邓辅财 张玉媚 +2 位作者 龙卢格格 钟永鸣 窦容妮 《生态与农村环境学报》 CAS CSCD 北大核心 2026年第4期508-519,共12页
基于过硫酸盐的高级氧化工艺在去除水体中抗生素类污染物方面展现出巨大应用潜力,其中催化剂对抗生素的吸附过程是实现高效催化降解的关键环节。本研究在室温条件下,通过简单搅拌Fe/Mn金属盐与1,4-苯二甲酸(1,4-BDC)的混合反应液,制备... 基于过硫酸盐的高级氧化工艺在去除水体中抗生素类污染物方面展现出巨大应用潜力,其中催化剂对抗生素的吸附过程是实现高效催化降解的关键环节。本研究在室温条件下,通过简单搅拌Fe/Mn金属盐与1,4-苯二甲酸(1,4-BDC)的混合反应液,制备出三维(3D)结构的Fe/Mn双金属有机框架(Fe,Mn-MOF)材料,并将其用于吸附与活化过硫酸盐(PS)以去除四环素(TC)。结果表明,Fe/Mn摩尔比为1∶0.1的3D Fe,Mn0.1-MOF对TC的吸附与催化性能最优,该材料具备丰富的孔隙结构与充足的活性位点,其比表面积可达202.01 m2·g-1,为高效吸附和催化降解TC提供了结构支撑。在298 K条件下,3D Fe,Mn0.1-MOF对初始浓度为45 mg·L-1的TC最大吸附容量可达243 mg·g-1;当体系中添加PS后,该材料可在45 min内将TC去除率提升至80%,充分体现其优异的吸附与催化协同性能。此外,3D Fe,Mn0.1-MOF在天然污染水体中的吸附与催化性能也得到了有效验证。经过3次循环使用后,3D Fe,Mn0.1-MOF/PS体系对TC的去除率仍维持在≥64%水平,表明该材料具有良好的循环稳定性和实际应用潜力。通过吸附动力学与吸附等温线模型分析可知,催化剂对TC的吸附过程符合拟一级动力学模型,且以物理吸附为主,同时该吸附反应为自发的吸热反应。自由基淬灭实验结果表明,TC的降解主要依赖于硫酸盐自由基(SO4·-)、羟基自由基(·OH)、单线态氧(1O2)和超氧阴离子(O2·-)4种自由基介导的反应途径。本研究不仅深化了对MOF/PS体系吸附-催化协同作用机理的认知,还为MOF材料在TC污染水体修复领域的实际应用提供了坚实的理论支撑与实践参考。 展开更多
关键词 Fe,Mn-MOF 吸附 过硫酸盐 四环素 自由基
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Roles of naturally occurring biogenic iron-manganese oxides(BFMO)in PMS-based environmental remediation:A complete electron transfer pathway 认领 引用 被引量：1
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作者 Feng Hu Lite Meng +2 位作者 Mei Wang Yunhui Zhang Zuxin Xu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第9期795-805,共11页
Bisphenol A(BPA)is a pervasive endocrine disruptor that enters the environment through anthropogenic activities,posing significant risks to ecosystems and human health.Advanced oxidation processes(AOPs)are promising m... Bisphenol A(BPA)is a pervasive endocrine disruptor that enters the environment through anthropogenic activities,posing significant risks to ecosystems and human health.Advanced oxidation processes(AOPs)are promising methods for the removal of organic microcontaminants in the environment.Biogenic manganese oxides(BMO)are reported as catalysts due to their transitionmetal nature,and are also readily generated bymanganeseoxidizing microorganisms in the natural environment,and therefore their roles and effects in AOPs-based environmental remediation should be investigated.However,biogenic ironmanganese oxides(BFMO)are actually generated rather than BMO due to the coexistence of ferrous ionswhich can be oxidized to iron oxides.Therefore,this study produced BFMO originating from a highly efficientmanganese-oxidizing fungus Cladosporium sp.XM01 and chose peroxymonosulfate(PMS)as a typical oxidant for the degradation of bisphenol A(BPA),a model organic micropollutant.Characterization results indicate that the formed BFMO was amorphouswith a lowcrystallinity.The BFMO/PMS system achieved a high degradation performance that 85%BPA was rapidly degraded within 60min,and therefore the contribution of BFMO cannot be ignored during PMS-based environmental remediation.Different from the findings of previous studies(mostly radicals and singlet oxygen),the degradationmechanism was first proven as a 100%electron-transfer pathway mediated by high-valence Mn under acidic conditions provided by PMS.The findings of this study provide new insights into the degradation mechanisms of pollutants using biogenic metal oxides in PMS activation and the contribution of their coexistence in AOPs-based environmental remediation. 展开更多
关键词 Mn oxide Peroxymonosulfate Bisphenols Oxidation Nonradical mechanism
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Al含量对铸态Fe-Mn-Al-C低密度钢显微组织和硬度的影响 认领 引用
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作者 王堤鹤 赵立冬 +3 位作者 庞启航 李维娟 史津铭 郭勇 《上海金属》 CAS 2026年第1期23-29,共7页
采用扫描电子显微镜、X射线衍射仪、激光扫描共聚焦显微镜和显微硬度计等,研究了Al含量对铸态Fe-Mn-Al-C低密度钢显微组织和硬度的影响。结果表明:铸态Fe-Mn-xAl(x=5,8,12,%,质量分数)-C低密度钢的显微组织主要由铁素体、奥氏体和κ-碳... 采用扫描电子显微镜、X射线衍射仪、激光扫描共聚焦显微镜和显微硬度计等,研究了Al含量对铸态Fe-Mn-Al-C低密度钢显微组织和硬度的影响。结果表明:铸态Fe-Mn-xAl(x=5,8,12,%,质量分数)-C低密度钢的显微组织主要由铁素体、奥氏体和κ-碳化物组成;随着Al含量的增加,试验钢的密度降低,硬度、铁素体含量和奥氏体转变温度均升高,奥氏体从块状转变为短棒状;铸态试验钢中κ-碳化物具有较高的稳定性。 展开更多
关键词 Fe-Mn-Al-C低密度钢 奥氏体变形 原位观察 第二相 析出
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热处理对Fe-Mn-Ni铸造合金组织演化及力学性能的调控 认领 引用
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作者 刘国强 白雅凯 +7 位作者 刘秋芳 张玉 宋宪涛 李新生 周瑞 白崇杉 王思亮 安业龙 《中国铸造装备与技术》 CAS 2026年第3期58-62,共5页
为优化Fe-Mn-Ni铸造合金的低温回火工艺,本文系统研究了150℃盐浴回火时长(0、10、30、60 min)对合金微观组织演化与力学性能的影响。采用X射线衍射(XRD)、扫描电子显微镜(SEM)及室温拉伸试验对热处理后的合金进行表征与分析。结果表明... 为优化Fe-Mn-Ni铸造合金的低温回火工艺,本文系统研究了150℃盐浴回火时长(0、10、30、60 min)对合金微观组织演化与力学性能的影响。采用X射线衍射(XRD)、扫描电子显微镜(SEM)及室温拉伸试验对热处理后的合金进行表征与分析。结果表明:随回火时间延长,位错密度持续降低,晶格畸变缓解;ε-碳化物依次经历形核、弥散析出及粗化三个阶段,马氏体基体组织保持稳定。当回火时间为30 min时,合金强塑性匹配最优,断口呈典型韧性断裂特征;回火时间过短(10 min)会导致内应力偏高、位错残留多,回火时间过长(60 min)则引起析出相粗化,二者均会劣化力学性能。本研究明确了回火时间对组织性能的调控机制,确定了150℃回火30 min为该合金的最优低温回火工艺参数,可为同类合金的热处理工艺优化提供试验依据。 展开更多
关键词 Fe-Mn-Ni合金 低温回火 显微组织 力学性能
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Fe-Mn-Al-Ni基形状记忆合金的研究进展和挑战 认领 引用
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作者 左阳 孙礼鑫 +3 位作者 范世满 付雨 文玉华 彭华备 《材料工程》 EI CAS CSCD 北大核心 2026年第7期51-61,共11页
Fe-Mn-Al-Ni基形状记忆合金的临界马氏体相变应力对温度的依赖性极低,并且展现出了超宽温域的超弹性(-263~240℃)。因此,该类形状记忆合金在航空航天、空间探索、减振抗震等工况多变的环境下具有广阔的应用前景。本文对影响Fe-Mn-Al-Ni... Fe-Mn-Al-Ni基形状记忆合金的临界马氏体相变应力对温度的依赖性极低,并且展现出了超宽温域的超弹性(-263~240℃)。因此,该类形状记忆合金在航空航天、空间探索、减振抗震等工况多变的环境下具有广阔的应用前景。本文对影响Fe-Mn-Al-Ni基形状记忆合金的超弹性的主要因素进行了回顾和展望。由于共格B2纳米相是Fe-Mn-AlNi基形状记忆合金马氏体相变由非热弹性转变为热弹性的核心。因此,首先探讨了共格B2纳米相调控Fe-Mn-Al-Ni基形状记忆合金马氏体相变的机制及其尺寸调控的相关进展。Fe-Mn-Al-Ni基形状记忆合金的超弹性与晶粒尺寸呈正相关,所以单晶的制备是获得优良超弹性的前提。因此,综述了近年来Fe-Mn-Al-Ni基形状记忆合金的单晶生长研究。然后,总结了单晶Fe-Mn-Al-Ni基形状记忆合金的功能特性。最后,对Fe-Mn-Al-Ni基形状记忆合金中B2纳米相对马氏体相变作用机理、大尺寸单晶的进一步开发以及自然时效和循环稳定性的改善等研究和发展方向进行了展望。 展开更多
关键词 Fe-Mn-Al-Ni基形状记忆合金 马氏体相变 共格B2纳米相 晶粒尺寸 超弹性
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Fe改性对MnCoOx催化剂CO氧化抗Pb中毒机理研究 认领 引用
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作者 周小辉 邢相栋 +2 位作者 李惠子 张英 沈正华 《烧结球团》 CAS 北大核心 2026年第3期134-143,共10页
MnCoOx催化剂低温CO氧化性能优异,但烧结烟气中存在的重金属Pb容易导致催化剂中毒失活。本文制备了Fe改性的高抗Pb中毒MnCoOx催化剂,并利用XRD、BET、H2-TPR、XPS、CO-TPD等表征分析揭示了Fe改性对MnCoOx催化剂抗Pb中毒性能的... MnCoOx催化剂低温CO氧化性能优异,但烧结烟气中存在的重金属Pb容易导致催化剂中毒失活。本文制备了Fe改性的高抗Pb中毒MnCoOx催化剂,并利用XRD、BET、H2-TPR、XPS、CO-TPD等表征分析揭示了Fe改性对MnCoOx催化剂抗Pb中毒性能的增强机理。机理研究表明:Fe改性MnCoOx催化剂在180℃时的CO转化率接近100%,在1%Pb中毒后仍保持90.6%的CO转化率,抗Pb中毒性能显著提升。Fe的引入不仅增大了催化剂比表面积,有效抑制了铅诱导的活性组分烧结团聚;还促进了高活性Mn3+和Co3+物种的生成与稳定,从而保留了CO吸附活性位点。此外,Fe改性还削弱了Pb物种对催化剂低温还原性及表面碳酸盐分解的抑制作用。 展开更多
关键词 Mn-Co催化剂 Fe改性 CO催化氧化 Pb中毒
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多孔Fe-Mn@Bt催化臭氧协同降解煤化工生化尾水的研究 认领 引用
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作者 朱辉 范国强 任梦娇 《河南城建学院学报》 CAS 2026年第3期82-91,共10页
为解决煤化工生化尾水臭氧利用效率低的问题,采用掺杂-焙烧法,以粉煤灰漂珠为造孔剂制备多孔Fe-Mn@Bt催化剂。通过单因素试验优化工艺条件,实现在水力停留时间15 min、催化剂投加量30 g·L-1、臭氧投加量2.0 g·h-1条件下,... 为解决煤化工生化尾水臭氧利用效率低的问题,采用掺杂-焙烧法,以粉煤灰漂珠为造孔剂制备多孔Fe-Mn@Bt催化剂。通过单因素试验优化工艺条件,实现在水力停留时间15 min、催化剂投加量30 g·L-1、臭氧投加量2.0 g·h-1条件下,总酚和TOC去除率分别达60.94%和58.48%,相较于单独臭氧氧化,臭氧利用率提升56.70%。SEM、BET和XRD表征显示,催化剂具有发达的孔道结构,活性组分主要为α-Fe2O3和α-MnO2。TBA抑制试验证实,降解过程以催化氧化为主导,吸附与直接氧化起协同作用。该催化剂在污水深度处理中展现出良好的应用前景。 展开更多
关键词 煤化工生化尾水 多孔Fe-Mn@Bt催化剂 臭氧催化氧化 协同作用 深度处理
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Fe oxides nano-modified pumice enhances hydrogenotrophic methanogenesis in anaerobic digestion:Performance and mechanism of microbial community 认领 引用
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作者 Jiaqi Liu Yong Zhang +5 位作者 Jian Huang Lili Yang Yuzhou Yang Guohao Deng Dingcheng Hu Chuanchuan Yan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第8期114-127,共14页
Anaerobic digestion(AD),as an eco-friendly biological process,shows potential for the decomposition of leachate produced by waste incineration power plants.In this study,the effects of Fe oxides nano-modified pumice(F... Anaerobic digestion(AD),as an eco-friendly biological process,shows potential for the decomposition of leachate produced by waste incineration power plants.In this study,the effects of Fe oxides nano-modified pumice(FNP)were investigated on the fresh leachate AD process.Firstly,a simple hydrothermal method was used to prepare FNP,then introduced into the UASB reactor to evaluate its AD efficiency.Results showed that the inclusion of FNP could shorten the lag phase by 10 days compared to the control group.Furthermore,cumulative methane production in the FNP group was enhanced by 20.11%.Mechanistic studies suggested that hydrogenotrophic methanogenesis in the FNP group was more pronounced due to the influence of key enzymes(i.e.,dehydrogenase and coenzyme F420).Microbial community analysis demonstrated that FNP could enhance the abundance of Methanosarcina,Proteobacteria,Sytrophomonas,and Limnobacter,which might elevate enzyme activity involved in methane production.These findings suggest that FNP might mediate interspecies electron transfer among these microorganisms,which is essential for efficient leachate treatment. 展开更多
关键词 Anaerobic digestion Fe oxides nano-modified pumice (FNP) Incineration leachate Methane production Functional enzyme Microbial community structure
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Mn和Fe双变量对Al-Si合金组织及力学性能的影响 认领 引用
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作者 杨云鹏 王安国 +4 位作者 刘玉林 胥晓晨 高正红 张峻槐 马晓宇 《特种铸造及有色合金》 CAS 北大核心 2026年第8期1208-1214,共7页
通过铸造方式获得Al-1.7Si-xMn-yFe合金,在保证Mn、Fe总量基本不变的条件下,同时改变Mn和Fe含量,对比分析两种元素对富铁相形貌和合金力学性能的影响。结果表明,当Mn含量为1.028%(质量分数,下同),Fe含量为0.094%时,合金中主要存在块状... 通过铸造方式获得Al-1.7Si-xMn-yFe合金,在保证Mn、Fe总量基本不变的条件下,同时改变Mn和Fe含量,对比分析两种元素对富铁相形貌和合金力学性能的影响。结果表明,当Mn含量为1.028%(质量分数,下同),Fe含量为0.094%时,合金中主要存在块状富锰相(α-Al15Mn3Si2相),随w(Mn)/w(Fe)减小,合金中开始形成汉字状的α-Al15(FeMn)3Si2相。当合金中Fe含量为0.768%,Mn含量为0.464%时,开始出现针状β-Al9Fe2Si2相,并且随w(Mn)/w(Fe)减小,β-Fe相尺寸持续增大。当Mn含量为0.846%,Fe含量为0.317%时,合金性能最佳,其抗拉强度、屈服强度及伸长率分别达162 MPa、123 MPa和10.55%。 展开更多
关键词 Al-Si-Mn-Fe合金 w(Mn)/w(Fe) 富铁相
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Optimisation of LiFe1-xMnxPO4 cathode material via a defect engineering strategy controlled by lattice mismatch 认领 引用
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作者 Wenjing Chen Rong Li +2 位作者 Fangxiang Song Xiaozhi Chen Qianlin Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第6期446-456,I0012,共11页
Olivine-structured LiFe(1-x)MnxPO4(LFMP)cathode materials are promising because they combine the excellent rate capability of LiFePO4 with the high operating voltage of LiMnPO4.However,lattice distortio... Olivine-structured LiFe(1-x)MnxPO4(LFMP)cathode materials are promising because they combine the excellent rate capability of LiFePO4 with the high operating voltage of LiMnPO4.However,lattice distortion induced by the Jahn–Teller effect in Mn3+considerably impedes lithium-ion transport,limiting the full performance of cathode materials.To address this issue,this study proposes a defect engineering strategy based on lattice mismatch regulation,enabling the controlled design of dislocation defect types through precise adjustment of the Fe/Mn ratio.A comprehensive investigation of the underlying mechanisms reveals that an optimal Fe/Mn ratio generates specific local dislocation morphologies by controlling the degree of lattice mismatch.This effectively transforms Jahn–Teller induced lattice defects into channels that facilitate rapid lithium-ion transport,thereby improving electrochemical performance.Accordingly,LiFe1-xMnxPO4(x=0.3,0.4,and 0.5)cathode materials are synthesised using a solid-state method.The best electrochemical performance is achieved at a Fe:Mn ratio of 6:4,delivering an initial discharge capacity of 178.3 m A h g-1,a Coulombic efficiency of 94.3%,and a capacity retention rate of96.5%after 1000 cycles at 1C.This finding provides a new approach for developing high-performance electrode materials for lithium-ion batteries through defect engineering design strategies. 展开更多
关键词 LFMP cathode Material lattice mismatch Defect engineering Mn/Fe ratio
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Antimony oxidation and adsorption by in-situ formed biogenic Mn oxide and Fe–Mn oxides 认领 引用 被引量：18
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作者 Yaohui Bai William A.Jefferson +2 位作者 Jinsong Liang Tingting Yang Jiuhui Qu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第4期126-134,共9页
Antimony（Sb）, which can be toxic at relatively low concentrations, may co-exist with Mn（Ⅱ）and/or Fe（Ⅱ） in some groundwater and surface water bodies. Here we investigated the potential oxidation and adsorption ... Antimony（Sb）, which can be toxic at relatively low concentrations, may co-exist with Mn（Ⅱ）and/or Fe（Ⅱ） in some groundwater and surface water bodies. Here we investigated the potential oxidation and adsorption pathways of Sb（Ⅲ and V） species in the presence of Mn（Ⅱ） and Mn-oxidizing bacteria, with or without Fe（Ⅱ）. Batch experiments were conducted to determine the oxidation and adsorption characteristics of Sb species in the presence of biogenic Mn oxides（BMOs）, which were formed in-situ via the oxidation of Mn（Ⅱ） by a Mn-oxidizing bacterium（Pseudomonas sp. QJX-1）. Results indicated that Sb（Ⅲ） ions could be oxidized to Sb（V） ions by BMO, but only Sb（V） originating from Sb（Ⅲ） oxidation was adsorbed effectively by BMO. Introduced Fe（Ⅱ） was chemically oxidized to Fe OOH, the precipitates of which mixed with BMO to form a new compound, biogenic Fe–Mn oxides（BFMO）. The BMO part of the BFMO mainly oxidized and the Fe OOH of the BFMO mainly adsorbed the Sb species. In aquatic solutions containing both As（Ⅲ） and Sb（Ⅲ）, the BFMO that formed in-situ preferentially oxidized Sb over As but adsorbed As more efficiently. Chemical analysis and reverse transcription real-time polymerase chain reaction revealed that the presence of Fe（Ⅱ）, As（Ⅲ） and Sb（Ⅲ） accelerated the oxidation of Mn（Ⅱ） but inhibited the activity of Mn-oxidizing bacteria. These results provide significant insights into the biogeochemical pathways of Sb, Mn（Ⅱ） in aquatic ecosystems, with or without Fe（Ⅱ）. 展开更多
关键词 Biogenic Mn oxide Biogenic Fe–Mn oxides Oxidation and adsorption Antimony Arsenic
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Synergy mechanisms of algal extracellular organic matter and manganese oxides in 17α-ethinylestradiol photochemical degradation 认领 引用
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作者 Zhicheng Liao Huan He +6 位作者 Feiyuan Liu Jingye Cui Ziwei Guo Al-Anazi Abdulaziz Bin Huang Hongwen Sun Xuejun Pan 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第4期99-113,共15页
17α-ethinylestradiol(EE2)is a persistent endocrine-disrupting chemical that threatens aquatic ecosystems.Algal extracellular organic matter(EOM),widespread manganese oxides(MnOx)and their photochemical interaction... 17α-ethinylestradiol(EE2)is a persistent endocrine-disrupting chemical that threatens aquatic ecosystems.Algal extracellular organic matter(EOM),widespread manganese oxides(MnOx)and their photochemical interactions can drive the natural degradation of EE2.However,these processes can be regulated by the unique surrounding conditions in eutrophic plateau lakes,including elevated levels of dissolved organic carbon,high pH,and abundant anions.Here,we investigated the enhancement of EE2 photodegradation mediated by EOM and MnOx,with emphasis on the effects of above unique surrounding conditions.Results showed that higher EOM concentrations proceed faster EE2 photodegradation rate by providing sufficient binding sites and more superoxide radicals for Mn(III)generation.In contrast,elevated pH inhibited EE2 degradation due to pH-dependent surface modifications of MnOx,which suppressed Mn(III)formation.Nitrate can enhance EE2 photodegradation without influencing Mn(III)generation.Product identification and density functional theory calculations suggest that EE2 degradation proceeds via free radical attack and Mn(III/IV)-mediated electron transfer,producing both small oxidized products and oligomers such as dimers and trimers.This study clarifies the environmental drivers of organic micropollutants’degradation in eutrophic lakes,highlighting the environmental significance of surrounding conditions. 展开更多
关键词 17α-ethinylestradiol degradation Algal extracellular organic matter Manganese oxide Reactive Mn(III) Photochemistry
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Synergistic enhancement of oxidation resistance and mechanical strength in L21-strengthened lightweight high-entropy alloys via Mn/Cr ratio engineering 认领 引用
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作者 Li-Peng Shao Ming-Bai Jiao +4 位作者 Xue-Cheng Jin Wei Wei Wen-Feng Yang Wen-Wen Sun Xu-Long An 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期317-340,共24页
The influence of Mn/Cr ratio variation in the Mn-Cr-rich body-centered cubic matrix phase on the high-temperature oxidation resistance and mechanical properties of L21-strengthened Al20Fe50CrxMn25-xTi5(x=1... The influence of Mn/Cr ratio variation in the Mn-Cr-rich body-centered cubic matrix phase on the high-temperature oxidation resistance and mechanical properties of L21-strengthened Al20Fe50CrxMn25-xTi5(x=15,25 at.%)lightweight high-entropy alloys(LWHEAs)was systematically investigated under a 168-h isothermal oxidation condition at 900℃.The results indicate that with the reduction in the Mn/Cr ratio,harmful oxides such as Mn2O3,MnO2,and spinel-type phases are progressively suppressed or even eliminated.Simultaneously,the dissolution kinetics of Al-Ti-rich L21 nano-precipitates in the x=25 at.%alloy(i.e.,Cr25Mn0)is significantly accelerated at elevated temperatures,leading to increased Al supply and promoting the formation of a thicker and more protective Al2O3 oxide layer.The oxidation rate constant kp of Cr25Mn0 was measured to be 3.61×10-7 mg2 cm-4 s-1,which is approximately one order of magnitude lower than that of Cr15Mn10(1.38×10-6 mg2 cm-4 s-1),demonstrating a substantial enhancement in oxidation resistance.Moreover,the decreasing Mn/Cr ratio enhances the solid solution strengthening effect within the LWHEA matrix,thereby improving mechanical performance.The average grain size of Cr25Mn0 decreased from 160.89μm in Cr15Mn10 to 140.39μm,corresponding to a grain refinement degree of 12.7%.When the Mn/Cr ratio reaches 0,the yield strength,Vickers hardness,ultimate compressive strength,and compressive fracture strain of Cr25Mn0 LWHEA increased by 5.74%,7.82%,20%,and 3.6%,respectively. 展开更多
关键词 Lightweight high-entropy alloy Oxidation resistance Mechanical property Body-centered cubic L21 nano-precipitate Mn/Cr ratio
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