ENVIRONMENTAL CATALYTIC MATERIALS |
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Advanced Oxidation Processes and Equipment Based on Zero-valent Iron |
XIONG Zhaokun, ZHANG Heng, LIU Yang, ZHOU Peng, HE Chuanshu, HUANG Rongfu, DU Ye, LAI Bo
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Sino-German Centre for Water and Health Research, College of Architecture and Environment, Sichuan University, Chengdu 610065, China |
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Abstract Zero-valent iron (ZVI) has the characteristics of low reduction potential, directional reduction of toxic groups, low price and easy availability, and environmental friendliness. ZVI has been widely used in the pretreatment of general industrial wastewater. However, ZVI also has problems such as narrow pH range, easy formation of passivation film, and low electron utilization. Advanced oxidation processes based on ZVI have gradually become a research hotspot. The combining of ZVI and oxidants not only significantly improves the removal effect of pollutants, but also broadens the applied range of ZVI. The electron transfer mechanisms among ZVI, oxidants and pollutants are very complicated. The analysis of the complex products and mechanisms in the ZVI/oxidant system has been continuously explored and developed. This article reviews the advanced oxidation processes and equipments based on ZVI. The advanced oxidation systems that combining ZVI with oxygen, hydrogen peroxi-de, ozone, persulfate, permanganate and other oxidants are introduced. The interaction mechanism between ZVI and oxidants is described from the perspective of electron migration. The corrosion products of ZVI and their catalytic capacity in the presence of different oxidants are analyzed. Moreover, the synergistic catalytic oxidation technologies based on ZVI are introduced. Furthermore, advanced oxidation treatment equipment and combined processes based on ZVI in practical wastewater treatment are summarized. Finally, the problems existing in the current ZVI/oxidant systems are analyzed and its application prospects are prospected.
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Published: 30 November 2021
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Fund:National Natural Science Foundation of China (51878423, 52070133). |
About author:: Zhaokun Xiong received his B. Eng. degree and Ph.D. in environmental engineering from Sichuan University in 2013 and 2018, respectively. He is currently an asso-ciate research fellow in Prof. Bo Lai's group at Sichuan University. His current research is focused on the synthesis of metal-organic frameworks in advanced oxidation processes applications for environmental remediation. Bo Lai received his B. Eng. and Ph.D. in environmental engineering from University of Science and Technology Beijing in 2005 and Beijing Normal University in 2011, respectively. He is currently a professor at Sichuan University. He is the advisor of Wu Yuzhang College, and dean of Environmental Science and Enginee-ring Department. His main research interests focus on advanced oxidation processes for the treatment of high-concentration refractory organic industrial wastewater and emerging pollutants. |
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