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

作　　者：Zhongsen Wang Lijun Qiu Yunhua Huang Meng Zhang Xi Cai Fanyu Wang Yang Lin Yanbiao Shi Xiao Liu 

机构地区：[1]Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of Education,College of Chemistry,Central China Normal University,Wuhan 430079,China

出　　处：《Chinese Chemical Letters》2024年第7期192-195,共4页中国化学快报（英文版）

基　　金：the National Key Research and Development Program of China(No.2019YFC1806203)for financial support。

摘　　要：Sulfidation of zero-valent iron(ZVI)has attracted broad attention in recent years for improving the sequestration of contaminants from water.However,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 contaminants.In this study,an alcohothermal strategy was employed for S-ZVI synthesis by the one-step reaction of iron powder with elemental sulfur.It is found that ferrous sulfide(FeS)with high purity and fine crystallization was formed on the ZVI surface,which is extremely favorable for electron transfer.Cr(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,respectively.Systematic 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 

分 类 号：X703[环境科学与工程—环境工程] TQ138.11[化学工程—无机化工]