INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Review of Nanoscale Zero Valent Iron-based Materials and Their Application in the Removal of Aqueous Nitrate Pollution |
LYU Xiaoshu1,*, WANG Xialing1, JIANG Guangming1, XIONG Kun1, WANG Xiaoli2, ZHANG Xianming1
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1 Engineering Research Center for Waste Oil Recovery Technology and Equipment,Ministry of Education,Chongqing Technology and Business University,Chongqing 400067, China 2 China Petroleum Group Chuanqing Drilling Engineering Co., Ltd. Safety and Environmental Quality Supervision and Inspection Research Institute,Chongqing 400042,China |
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Abstract Aqueous nitrate (NO3-) contamination is an ubiquitous environmental problem because of the extensive application of the relevant chemicals;the remediation of water polluted by nitrate via economic and effective methods, evenly realizing complete harmlessness is crucial. Nanoscale zero-valent iron (nZVI) is a typical engineered nanomaterial that is potentially used in environmental remediation of nitrate pollution. In this paper, based on the application and development of nZVI technology in nitrate reduction, the prior studies mainly focus on the following:(1) improving its synthesis method or combining with other remediation techniques to improve its efficiency in in-situ remediation and enhance its resilience towards high concentration nitrate wastewater;(2) investigating the effects of environmental conditions including temperature, dissolved oxygen, solution pH, and competitive coexisting ions, to guide its practical applications. Although nZVI technology possesses remarkable potential in NO3-conversion, some difficulties remain, especially the short lifetime, limited mass transfer and adsorption capacity, and low selectivity towards nitrogen as a final product. These hinder the large-scale practical application of the technology. Therefore, functionalized nZVI-based materials, upon suitable modification, have gradually become promising substitutes for bare nZVI. Herein, these modified materials are classified into three types, namely the supported, bimetallic, and the surface-modification system, especially emphasizing their advantages as compared with bare nZVI and revealing its promotion mechanism and factors affecting nitrate reduction energy efficiency. Finally, the existing problems to be addressed are identified, and future objectives and research areas worthy of exploration in the field of nZVI-based remediation technology are proposed.
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Published: 25 February 2023
Online: 2023-03-02
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Fund:Projects Under the National Natural Science Foundation of China (51978110), Chongqing Basic and Frontier Research Project (cstc2019jcyj-msxmX0260), and Chongqing Education Commission Research Project(KJQN201900837). |
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