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

Chinese Chemical Letters 2023年第6期34卷 225-229页

作者： Yue Yuan Zhikui Zhou Xinyi Zhang Xin Li Yulu Liu Shengtao Yang Bo Lai Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission School of Chemistry and EnvironmentSouthwest Minzu UniversityChengdu 610041China Key Laboratory of General Chemistry of the National Ethnic Affairs Commission School of Chemistry and EnvironmentSouthwest Minzu UniversityChengdu 610041China College of Resource and Environment Chengdu University of Information TechnologyChengdu 610041China College of Architecture and Environment Sichuan UniversityChengdu 610041China

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 ***,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 *** 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 *** utilization ability of electrons in m Fe/cu system is 12.5 times higher than that in mfe^(0)*** 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

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