Catalytic Performance of Amorphous Alloy in Wastewater Treatment
PEI Liefei1,2, ZHANG Xiangyun1, YUAN Zizhou1
1 School of Materials Science and Engineering, Lanzhou University of Technology , Lanzhou 730050, China 2 School of Mining and Metallurgical Engineering, Baiyin Mining and Metallurgical Vocational and Technical College, Baiyin 730900, Gansu, China
Abstract: With the development of printing and dyeing industry, the discharge of dye wastewater has become one of the main sources of water pollution. At present, the commonly used degradation agent zero-valent iron (ZVI) has a serious surface passivation phenomenon and a single type of active center, which leads to its low degradation efficiency of dyes. Therefore, there is an urgent need to develop new biodegradable materials with high reaction activity and good recycling as a substitute for ZVI. The amorphous alloy (MGs) with thermodynamic metastable structure becomes more and more important in the field of catalytic reaction because of its excellent catalytic activity. The results show that MGs has ultra-high degradation efficiency, low metal leaching rate and stable catalytic performance in the treatment of dye wastewater. This paper briefly describes the current pollution status and treatment methods of dye wastewater, and focuses on the research progress of Fe-based, Mg-based and other amorphous alloys as environmental catalysts for the degradation of azo dyes. The properties of decolorization, mineralization, metal lea-ching, persistence and reusability in degradation are systematically reviewed. Compared with ZVI and crystalline alloys, the unique physical structure and properties lead to the decrease of activation energy, the increase of apparent reaction rate constant, the downward shift of valence band top, the decrease of redox potential and the shedding of product layer in the reaction with dyes. Compared with other traditional processing me-thods, it is found that the performance advantage of MGs is obvious. However, there are still some problems in engineering applications, such as poor amorphous forming ability, secondary environmental pollution caused by metal leaching and so on. For this reason, this paper puts forward some suggestions for the further development and application of MGs catalyst. (1) Compounding with other highly conductive substances (such as biochar) can reduce the amount of catalyst and improve the ability of electron transport at the same time. (2) The theoretical relationship between amorphous, electronic structure and catalytic performance should be established. (3) Its application scope should be extended to the treatment of petrochemical wastewater, pharmaceutical wastewater, heavy metal wastewater and other polluted wastewater. It is expected to provide more new references for MGs in the field of environmental pollutant degradation.
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2022, Vol. 36 
