草酸调控零价铁对土壤和水体中污染物去除的研究进展  

Research progress on the oxalic acid-regulated zero-valent iron for pollutant removal in soil and water column

作　　者：倪圳 李航宇 康振宇 盛鸿涛 王宇晴 陈梦舫[2] 刘仁兰 钱林波[2] Zhen Ni;Hangyu Li;Zhenyu Kang;Hongtao Sheng;Yuqing Wang;Mengfang Chen;Renlan Liu;Linbo Qian(School of Life and Environmental Sciences,Wenzhou University,Wenzhou 325035,China;Nanjing Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]温州大学生命与环境科学学院,温州325035 [2]中国科学院南京土壤研究所,南京210008

出　　处：《科学通报》2024年第26期3934-3942,共9页Chinese Science Bulletin

基　　金：国家重点研发计划(2022YFA3702103);国家自然科学基金(42177239)资助。

摘　　要：零价铁对变价重金属和有机污染物具有良好的还原和吸附作用,在土壤和水体污染修复中具有较大的应用潜力.草酸作为一种有机小分子酸,能有效改善零价铁的表面氧化层,增强其电子转移能力,并促进亚铁离子的氧化还原循环反应过程,从而显著提升零价铁的性能.本文通过对比草酸调控前后的性能差异,阐明了草酸调控的优点,探讨了草酸调控零价铁在去除铬、三氯乙烯,以及硝酸盐等污染物的研究进展;掲示了草酸调控零价铁在吸附、还原及高级氧化体系中对污染物的去除机制;明确了草酸调控零价铁的结构与污染物去除的关键调控因素,并对草酸调控零价铁在土壤和水体修复中的应用前景进行了展望.本研究为草酸调控零价铁去除污染物的机理研究和实际应用提供理论依据和技术参考.Zero-valent iron(Fe^(0)),which adsorbs and reduces typical heavy metals and organic pollutants,has emerged as a promising and environmentally friendly reductant for soil and water pollution remediation.However,Fe^(0) tends to form surface oxides and corrosion products that reduce its electron transfer rate and overall efficiency,thereby degrading its performance.Accordingly,researchers have modulated Fe^(0) with oxalic acid(OA)to improve its surface properties and enhance its pollutant-removal capabilities.This review systematically summarizes the research progress on OA-modulated Fe^(0) in soil and water pollution remediation.We begin by discussing the advantages of OA modulation,highlighting its ability to improve the electron transfer rate of Fe^(0) by altering the surface oxide layer on Fe^(0) and promoting the redox cycle of ferrous ions.Through these processes,OA modulation enhances the removal of heavy metals,organic pollutants,and inorganic anions.We discuss the removal of Cr(Ⅵ)as a case study of heavy-metal removal.OA effectively promotes the reduction of Cr(Ⅵ)to Cr(Ⅲ)by acting as an electron donor,forming stable complexes with Fe(Ⅱ).OA also facilitates the removal of Cr(Ⅲ)-EDTA complexes by generating singlet oxygen(^(1)O_(2))and promoting Cr(OH)3 precipitation.We then explore the application of OA-modulated Fe^(0) in the removal of other heavy metals such as As(Ⅲ),Cd,Pb,and Zn,demonstrating its potential for eliminating a wide range of heavy-metal contaminants.In the realm of organic pollutants,OA-modulated Fe^(0) can potentially remove chlorinated hydrocarbons such as trichloroethylene(TCE),perchloroethylene(PCE),and organic dyes.OA effectively eliminates the passivating Fe(OH)_(3) layer on Fe^(0),facilitating direct electron transfer and enhancing the adsorption and reduction of chlorinated hydrocarbons.In addition,OA promotes the generation of hydroxyl radicals in advanced oxidation processes such as the Fenton reaction and peroxymonosulfate(PMS)activation,enabling the efficient degradat

关 键 词：零价铁 草酸 土壤 水体 

分 类 号：X505[环境科学与工程—环境工程]