Unveiling the crucial role of iron mineral phase transformation in antimony(V)elimination from natural water  

作　　者：Xiaoyun Liu Yunyan Wang Hongrui Xiang Jiahui Wu Xu Yan Wenchao Zhang Zhang Lin Liyuan Chai 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals,Changsha 410083,China [3]Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,Changsha 410083,China

出　　处：《Eco-Environment & Health》2023年第3期176-183,共8页生态环境与健康（英文）

基　　金：financially supported by the National Key R&D Program of China(No.2022YFC3900200);Foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.52121004);Major program Natural Science Foundation of Hunan Province of China(No.2021JC0001);National Natural Science Foundation of China(No.22276218);key projects of Science and Technology of Hunan Province(No.2020SK2006);Science and Technology Innovation Program of Hunan Province(No.2021RC3013).

摘　　要：Antimony(Sb)in natural water has long-term effects on both the ecological environment and human health.Iron mineral phase transformation(IMPT)is a prominent process for removing Sb(V)from natural water.However,the importance of IMPT in eliminating Sb remains uncertain.This study examined the various Sb–Fe binding mechanisms found in different IMPT pathways in natural water,shedding light on the underlying mechanisms.The study revealed that the presence of goethite(Goe),hematite(Hem),and magnetite(Mag)significantly affected the concentration of Sb(V)in natural water.Elevated pH levels facilitated higher Fe content in iron solids but impeded the process of removing Sb(V).To further our understanding,polluted natural water samples were collected from various locations surrounding Sb smelter sites.Results confirmed that converting ferrihydrite(Fhy)to Goe significantly reduced Sb levels(<5μg/L)in natural water.The emergence of secondary iron phases resulted in greater electrostatic attraction and stabilized surface complexes,which was the most likely cause of the decline of Sb concentration in natural water.The comprehensive findings offer new insights into the factors governing IMPT as well as the Sb(V)behavior control.

关 键 词：Ferrihydrite transformation Water environment Sb(V)level Removal mechanism Pollution control 

分 类 号：X5[环境科学与工程—环境工程]