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Effects of zero-valent iron added in the flooding or drainage process on cadmium immobilization in an acid paddy soil

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Journal of Environmental Sciences 2024年第4期138卷 19-31页

作者： Hanbing Meng Shiwen Hu Zebin Hong Wenting Chi Guojun Chen Kuan Cheng QiWang Tongxu Liu Fangbai Li Kexue Liu Yang Yang Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China School of Resources and Planning Guangzhou Xinhua UniversityGuangzhou 510310China University of Chinese Academy of Sciences Beijing 100049China

zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy ***,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain ***,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 *** addition of ZVI to the flooding process was more conducive to Cd *** 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 ***,the reductive dissolution of Fe minerals promoted the release of soil colloids,thereby increasing significantly the surface sites and causing Cd ***,the addition of ZVI before flooding played a vital role in Cd retention after soil *** 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 *** 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.

关键词： Paddy soil zero-valent iron Cadmium Flooding and drainage Remediation

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Alcohothermal synthesis of sulfidated zero-valent iron for enhanced Cr(Ⅵ)removal

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Chinese Chemical Letters 2024年第7期35卷 192-195页

作者： Zhongsen Wang Lijun Qiu Yunhua Huang Meng Zhang Xi Cai Fanyu Wang Yang Lin Yanbiao Shi Xiao Liu Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of Education College of ChemistryCentral China Normal UniversityWuhan 430079China

Sulfidation of zero-valent iron(ZVI)has attracted broad attention in recent years for improving the sequestration of contaminants from ***,sulfidated ZVI(S-ZVI)is mostly synthesized in the aqueous phase,which usually causes the formation of a thick iron oxide layer on the ZVI surface and hinders the efficient electron transfer to the *** this study,an alcohothermal strategy was employed for S-ZVI synthesis by the one-step reaction of iron powder with elemental *** is found that ferrous sulfide(FeS)with high purity and fine crystallization was formed on the ZVI surface,which is extremely favorable for electron ***(Ⅵ)removal experiments confirm that the rate constant of SZVI synthesized by the alcohothermal method was 267.1-and 5.4-fold higher than those of un-sulfidated ZVI and aqueous-phase synthesized S-ZVI,*** characterizations proved that Cr(Ⅵ)was reduced and co-precipitated on S-ZVI in the form of a Fe(Ⅲ)/Cr(Ⅲ)/Cr(Ⅵ)composite,suggesting its environmental benignancy.

关键词： zero-valent iron Sulfidation Alcohothermal method Cr(Ⅵ)removal

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Biochar and zero-valent iron sand filtration simultaneously removes contaminants of emerging concern and Escherichia coli from wastewater effluent

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Biochar 2023年第1期5卷 710-722页

作者： Linyan Zhu Suhana Chattopadhyay Oluwasegun Elijah Akanbi Steven Lobo Suraj Panthi Leena Malayil Hillary A.Craddock Sarah M.Allard Manan Sharma Kalmia E.Kniel Emmanuel F.Mongodin Pei C.Chiu Amir Sapkota Amy R.Sapkota Maryland Institute for Applied Environmental Health University of Maryland School of Public HealthCollege ParkMDUSA Department of Civil and Environmental Engineering University of DelawareNewarkDEUSA Department of Pediatrics University of California San DiegoSan DiegoCAUSA United States Department of Agriculture Agriculture Research ServiceNortheast AreaBeltsville Agriculture Research CenterEnvironmental Microbiology and Food Safety LaboratoryBeltsvilleMDUSA Department of Animal and Food Science University of DelawareNewarkDEUSA Institute for Genome Sciences and Department of Microbiology and Immunology University of Maryland School of MedicineBaltimoreMDUSA Department of Epidemiology and Biostatistics School of Public HealthUniversity of MarylandCollege ParkMDUSA Present Address:Division of Lung Diseases National Institutes of Health(NIH)National HeartLung and Blood Institute(NHLBI)BethesdaMDUSA

Advanced treated municipal wastewater is an important alternative water source for agricultural ***,the possible persistence of chemical and microbiological contaminants in these waters raise potential safety concerns with regard to reusing treated wastewater for food crop *** low-cost and environmentally-friendly filter media,biochar(BC)and zero-valent iron(ZVI),have attracted great interest in terms of treating reused ***,we evaluated the efficacy of BC-,nanosilver-amended biochar-(Ag-BC)and ZVI-sand filters,in reducing contaminants of emerging concern(CECs),Escherichia coli(***)and total bacterial diversity from wastewater *** experiments were conducted with control quartz sand and sand columns containing BC,Ag-BC,ZVI,BC with ZVI,or Ag-BC with *** filtration,Ag-BC,ZVI,BC with ZVI and Ag-BC with ZVI demonstrated more than 90%(>1 log)removal of *** from wastewater samples,while BC,Ag-BC,BC with ZVI and Ag-BC with ZVI also demonstrated efficient removal of tested *** bacterial diversity was also observed after filtration;however,differences were marginally *** addition,significantly(p<0.05)higher bacterial diversity was observed in wastewater samples collected during warmer versus colder *** of silver ions occurred from Ag-BC columns;however,this was prevented through the addition of *** conclusion,our data suggest that the BC with ZVI and Ag-BC with ZVI sand filters,which demonstrated more than 99%removal of both CECs and *** without silver ion release,may be effective,low-cost options for decentralized treatment of reused wastewater.

关键词： Biochar zero-valent iron Wastewater reuse Contaminants of emerging concern Recycled water E.coli

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A zero-valent iron and organic matter mixture enhances herbicide and herbicide degradation product removal in subsurface waters

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Journal of Environmental Sciences 2017年第7期29卷 411-417页

作者： Kaisa Kerminen Ville Salovaara Merja Hannele Kontro University of Helsinki Department of Ecological and Environmental Sciences15140 LahtiFinland

The pesticide atrazine,its degradation products,and 2,6-dichlorobenzamide（BAM） are persistent in groundwater *** studied whether their dissipation can be enhanced with a mixture of a complex carbon source and zero-valent iron（ZVI） called EHC.The application rates were 1.0% and 2.0%（by weight） in subsurface sediments slurries（atrazine 30 mg/L）,and 2.0% in 1.5 m pilot-scale sediment columns with groundwater flowing through（atrazine 0.08,desethylatrazine DEA 0.03,BAM 0.02 μg/L）.In the slurries under aerobic conditions,atrazine of 0.88 ± 0.14 mg/g of EHC was dissipated chemically,as concentrations did not differ significantly between the slurries and their sterilized *** degradation occurred in the slurries under anaerobic *** the pilot-scale columns under water-saturated conditions,atrazine,DEA and BAM were not detected in effluents during 33,64 and 64 days from the beginning of the water flow through EHC columns,respectively,but thereafter traces of compounds could be *** atrazine or degradation products（BAM,DEA,deisopropylatrazine,desethyldeisopropylatrazine） could be extracted from the column sediments at the end of the *** a result,the sum of dissipated pesticides was about7.6 μg/g of EHC in columns under water-saturated conditions,and 0.88 mg/g of EHC in slurries under aerobic *** can be used to enhance the dissipation of studied pesticides in small quantities,preferentially under aerobic conditions.

关键词： Herbicides Subsurface sediments Dissipation EHC~ Organic matter zero-valent iron

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Effects of pH and particle size on kinetics of nitrobenzene reduction by zero-valent iron

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Journal of Environmental Sciences 2010年第11期22卷 1741-1747页

作者： Jun Dong Yongsheng Zhao Ran Zhao Rui Zhou College of Environment and Resources Jilin University Changchun 130026 China. College of Chemistry Jilin University Changchun 130026 China

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.

关键词： zero-valent iron nitrobenzene reduction aniline formation particle size

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Ligand effects on arsenite removal by zero-valent iron/O2: Dissolution, corrosion, oxidation and coprecipitation

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Journal of Environmental Sciences 2019年第12期31卷 131-140页

作者： Xiaojie Song Chen Zhang Bingdang Wu Xiaomeng Wang Zhihao Chen Shujuan Zhang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University

Ligands may increase the yields of reactive oxygen species(ROS)in zero-valent iron(ZVI)/O2 *** clarify the relationship between the properties of ligands and their effects on the oxidative removal of contaminants,five common ligands(formate,acetate,oxalate,ethylenediaminetetraacetic acid(EDTA),and phosphate)as well as acetylacetone(AA)were investigated with arsenite(As(III))as the target contaminant at three initial p H values(3.0,5.0,and 7.0).The addition of these ligands to the ZVI/O2 system resulted in quite different effects on As(III)*** enhanced the oxidation of As(III)to arsenate(As(V))but inhibited the removal of As(V).Oxalate was the only ligand in this work that accelerated both the removal of As(III)and As(V).By analyzing the ligand effects from the four aspects:dissolution of surface iron(hydr)oxides,corrosion of ZVI,reaction with ROS,and interference with precipitation,the following properties of ligands were believed to be important:ability to provide dissociable protons,complexation ability with iron,and reactivity with *** complexation ability is a double-edged *** could enhance the generation of ROS by reducing the reduction potential of the Fe(III)/Fe(II)redox couple,but also could inhibit the removal of arsenic by *** elucidated relationship between the key property parameters of ligands and their effects on the ZVI/O2 system is helpful for the rational design of effective ZVI/ligand/O2 systems.

关键词： zero-valent iron Ligand Arsenite Acetylacetone

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Cysteine-enhanced reductive degradation of nitrobenzene using nano-sized zero-valent iron by accelerated electron transfer

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Journal of Environmental Sciences 2021年第2期33卷 110-116页

作者： Yuanming Peng Yunsong Mu Chao Xue Anwei Chen Liang Peng Haiyong Wu Si Luo College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China School of Enuironment&Natural Resources Renmin University of ChinaBeijing 100872China Soil and Fertilizer Institute of Hunan Province Hunan Academy of Agricultural SciencesChangsha 401125China 不详

As an aliphatic amino acid,cysteine(CYS)is diffuse in the living cells of plants and ***,little is known of its role in the reactivity of nano-sized zero-valent iron(NZVI)in the degradation of *** study shows that the introduction of CYS to the NZVI system can help improve the efficiency of reduction,with 30%more efficient degradation and a reaction rate constant nine times higher when nitrobenzene(NB)is used as probe *** rates of degradation of NB were positively correlated with the range of concentrations of CYS from 0 to 10 mmol/*** introduction of CYS increased the maximum concentration of Fe(Ⅲ)by 12 times and that of Fe(II)by four times in this system.A comparison of systems featuring only CYS or Fe(Ⅱ)showed that the direct reduction of NB was not the main factor influencing its CYS-stimulated *** reduction in the concentration of CYS was accompanied by the generation of cystine(CY,the oxidized form of cysteine),and both eventually became *** introduction of CY also enhanced NB degradation due to NZVI,accompanied by the regeneration of *** supports the claim that CYS can accelerate electron transfer from NZVI to NB,thus enhancing the efficiency of degradation of NB.

关键词： zero-valent iron Nanoparticles CYS Electron shuttle Reactivity

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An old story with new insight into the structural transformation and radical production of micron-scale zero-valent iron on successive reactivities

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Chinese Chemical Letters 2020年第10期31卷 2634-2640页

作者： Xinhao Wang Xueting Pu Yue Yuan Yunjie Xiang Yuling Zhang Zhaokun Xiong Gang Yao Bo Lai State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Sino-German Centre for Water and Health Research Sichuan UniversityChengdu 610065China National Engineering Laboratory for Clean Technology of Leather Manufacture College of Biomass Science and EngineeringSichuan UniversityChengdu 610065China Institute of Environmental Engineering RWTH Aachen UniversityAachen 52062Germany

It is generally recognized that the formation and accumulation of iron oxides on the surface of zero-valent iron(Fe^(0))resulting in significant decrease of contaminant degradation rates during the long-term ***,in this study,we found that the removal efficiencies of p-nitrophenol(PNP)by micro zero-valent iron(mFe^(0))could maintain at the satisfactory level in the process of continuous reactions(20 cycles).The removal rate constant(0.1779 min^(-1))of the 5th cycle was 6.74 times higher than that of the 1streaction(0.0264 min^(-1)),even the 20th cycle(0.0371 min^(-1))was higher than that of the 1st ***,almost no dissolved iron was detected in the solution,and the total iron concentrations decreased dramatically with the process of continuous *** results of scanning electron microscope and energy dispersive spectrometry(SEM-EDS)and X-ray diffraction(XRD)revealed that the structure and composition of corrosion products change from amorphous to highly crystal with the increase of the number of *** corrosion products were mainly magnetite(Fe_(3)O_(4))and a small part of maghemite(γ-Fe_(2)O_(3)),which were in the form of micro sphe res on the surface of mFe^(0).The formation of surface oxidation shell hindered the release of Fe^(2+).X-ray photoelectron spectroscopy(XPS)results illustrated that partial Fe3O_(4) could be converted into y-Fe_(2)O_(3).Electrochemical analysis proved that the electron transfer rate of mFe^(0) increased with the formation of the oxides ***,the consumption of iron core and thicker oxide film weakened the electron transfer ***,the quenching experiments indicated that the reaction activity of mFe^(0) could be enhanced with the addition of *** study deepened the understanding of the structural transformation and radical production of mFe^(0) in continuous reactions.

关键词： zero-valent iron iron oxides p-Nitrophenol Structural transformation Successive reactivities

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The applicability of biochar and zero-valent iron for the mitigation of arsenic and cadmium contamination in an alkaline paddy soil

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Biochar 2019年第2期1卷 203-212页

作者： Jiangtao Qiao Huanyun Yu Xiangqin Wang Fangbai Li Qi Wang Yuzhen Yuan Chuanping Liu Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management Guangdong Institute of Eco-environmental Science and TechnologyNo.808 Tianyuan RoadGuangzhou 510650People’s Republic of China

In paddy fields, the opposing transformation of arsenic (As) and cadmium (Cd) poses many challenges for their simultaneous *** our previous study,we reported that combined biochar and zero-valent iron(ZVI)amendment had great potential for the simultaneous alleviation of As and Cd bioavailability in contaminated acid paddy *** this study,an As-and Cd-contaminated alkaline paddy soil was further studied,and the same ZVI-biochar mixtures amendments were applied to evaluate the impact of the mixtures on As and Cd transformation and translocation in the soil-rice system by performing pot experiments with *** line with our previous study,the ZVI-biochar composites significantly reduced As and Cd accumulation in different rice tissues,leading to a 42%and 47%decrease in rice grain As and Cd levels,respectively,compared with the control *** ZVI-biochar mixtures exhibited synergistic effects of biochar and ZVI by enhancing the transformation of bioavailable As and Cd fractions into less bioavailable fractions,and by increasing iron plaque formation to reduce As and Cd *** the bioaccumulation and translocation factors of As and Cd in alkaline paddy soil were generally lower than those in acid paddy soil,particularly in the presence of the ZVI-biochar mixtures,the grain As and Cd levels did not achieve the desired food safety standard levels,probably related to the high soil As content and the small changes in soil ***,for treating lightly and moderately contaminated paddy soils,ZVI-biochar mixtures can still be a good choice in the future.

关键词： Biochar zero-valent iron Arsenic and cadmium Translocation Alkaline paddy soil

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Remediation of arsenic contaminated soil by sulfidated zero-valent iron

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 85-95页

作者： Junlian Qiao Yang Liu Hongyi Yang Xiaohong Guan Yuankui Sun State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092China

In this study,the influences of sulfidation on zero-valent iron(ZVI)performance toward As(Ⅴ)immobilization in soil were systemically *** was found that,compared to unamended ZVI,sulfidated ZVI(S-ZVI)is more favorable to immobilize As(Ⅴ)in soil and promote the conversion of water soluble As to less mobile Fe-Mn bound ***,under the optimal S/Fe molar ratio of 0.05,almost all of the leached As could be sequestrated by>0.5 wt.%S-ZVI within 3 *** the presence of HA could decrease the desorption of As from soil,HA inhibited the reactivity of S-ZVI to a greater *** experiments further proved the feasibility of applying S-ZVI on soil As(Ⅴ)*** importantly,to achieve a good As retention performance,S-ZVI should be fully mixed with soil or located on the downstream side of As *** test simulating the flooding conditions in rice culture revealed there was also a good long-term stability of soil As(Ⅴ)after S-ZVI remediation,where only 0.7%of As was desorbed after 30 days of *** separation was employed to separate the immobilized As(Ⅴ)from soil after S-ZVI amendment,where the separation efficiency was found to be dependent of the iron dosage,liquid to soil ratio,and reaction *** characteristic leaching procedure(TCLP)tests revealed that the leachability of As from soil was significantly reduced after the S-ZVI amendment and magnetic separation *** these findings provided some insights into the remediation of As(Ⅴ)-polluted soil by ZVI.

关键词： Soil As(Ⅴ) Sulfidation zero-valent iron Magnetic separation

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