Efficient reduction of hexavalent chromium with microscale Fe/Cu bimetals:Efficiency and the role of Cu  

作　　者：Yue Yuan Zhikui Zhou Xinyi Zhang Xin Li Yulu Liu Shengtao Yang Bo Lai 

机构地区：[1]Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China [2]Key Laboratory of General Chemistry of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China [3]College of Resource and Environment,Chengdu University of Information Technology,Chengdu 610041,China [4]College of Architecture and Environment,Sichuan University,Chengdu 610041,China

出　　处：《Chinese Chemical Letters》2023年第6期225-229,共5页中国化学快报（英文版）

基　　金：the financial support from Fundamental Research Funds for the Central Universities(Southwest Minzu University,No.U2021124);the Startup Foundation of Chengdu University of Information Technology(No.KYTZ202013);National Natural Science Foundation of China(No.21808146);China Postdoctoral Science Foundation(No.2018M643479)。

摘　　要：Microscale zero valent iron(mFe^(0))is one of the most potential water pollution remediation materials,but the effective utilization ability of electrons released by mFe^(0)in the reduction of hexavalent chromium(Cr(VI))is not satisfactory.Here,we find the microscale iron-copper(m Fe/Cu)bimetals coated with copper on the surface of mFe^(0)can significantly improve the effective utilization of electrons released by mFe^(0).Electrochemical analysis displays that copper plating on the surface of m Fe/Cu can promote the release the electrons from mFe^(0)and reduce the impedance of mFe^(0).Spin-polarized density functional theory(DFT)calculation reveals that Cu on the surface of m Fe/Cu bimetals promotes the release of electrons from mFe^(0)and reduces the adsorption energy of Fe to Cr.As the electron transporter,moreover,Cu can always attract Cr to the hollow position near itself of the Fe surface,which could promote the effective utilization of electrons released by Fe.Effective utilization ability of electrons in m Fe/Cu system is 12.5 times higher than that in mFe^(0)system.Our findings provide another basis for the efficient reduction of Cr(VI)by m Fe/Cu bimetals,which could promote the application and popularization of m Fe/Cu bimetals.

关 键 词：Zero valent iron mFe/Cu bimetals Hexavalent chromium Mechanism Elecreons 

分 类 号：X703[环境科学与工程—环境工程]