Sulfidation of nano zero-valent iron for enhanced hexavalent chromium removal performance  

作　　者：Xiu-juan Feng Xiao-yi Wang Dong-ming Li Zhi-han Liu Yue-long Yan 

机构地区：[1]School of Mines,China University of Mining and Technology,Xuzhou 221116,China [2]Rare Earth Research Institute,China University of Mining and Technology,Xuzhou 221116,China [3]School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China [4]Mechano Chemistry Research Institute,China University of Mining and Technology,Xuzhou 221116,China [5]School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Nanchang 341000,China

出　　处：《Water Science and Engineering》2024年第3期249-256,共8页水科学与水工程(英文版)

基　　金：supported by the National Key Research and Development Program of China(Grants No.2018YFC1801800,2019YFC1805600,2021YFC2902701,and 2021YFC2902100);the Shandong Provincial Major Science and Technology Innovation Project(Grant No.2021CXGC011206);the Key Project of the National Natural Science Foundation of China(Grant No.52130402).

摘　　要：Nano zero-valent iron(nZVI)and sulfidation-modified nZVI(S-nZVI)were synthesized and used to remove hexavalent chromium(Cr(Ⅵ))in wastewater.Characterization of the products showed that the sulfidation process significantly changed the morphology of nZVI,with enhanced crystallinity.The effects of S/Fe ratio,pH value,and reaction temperature on Cr(Ⅵ)removal were studied.A S/Fe ratio of 0.5 was the most appropriate parameter,with a removal efficiency of 98%in the condition of pH=2.The effects of anions(Cl^(-),NO_(3)^(-),CO_(3)^(2-),and SO_(4)^(2-))and cations(Ca^(2+)and Mg^(2+))on the Cr(Ⅵ)removal efficiency were investigated,and the relevant mechanisms were discussed.The Cr(VI)removal efficiency of S-nZVI was significantly greater than that of nZVI,mainly owing to the existence of FeS layers that could protect Fe^(0)cores and prompt electron transfer.The aging and cycling experiments showed that S-nZVI could maintain its reactivity when facing the corrosion of water,and showed cycling stability.Thus,S-nZVI is an effective and feasible agent for the remediation of Cr(VI)-contained wastewater.

关 键 词：S-nZVI Cr(Ⅵ)removal WASTEWATER SULFIDATION FeS layers Cycling stability 

分 类 号：TG1[金属学及工艺—金属学]