氧化剂
三元运算
材料科学
化学工程
电解
电子转移
镍
降级(电信)
X射线光电子能谱
碳纤维
曝气
化学
冶金
电极
复合材料
复合数
物理化学
计算机科学
工程类
电解质
程序设计语言
电信
有机化学
作者
Mengmeng Xiong,Weifang Chen,Siyi Gu,Daofang Zhang,Chenyang Ma,Gu He,Yaojia Meng,Ya Jin,Zhihua Xu
标识
DOI:10.1016/j.jclepro.2022.133769
摘要
In this work, core-shell iron/[email protected] (Fe/[email protected]) and conventional supported iron/nickel-carbon (Fe/Ni-AC) ternary micro-electrolysis materials were synthesized and utilized for the removal of 4-nitrochlorobenzene (4-NCB). The characterization of Fe/[email protected] were preliminarily investigated and compared with Fe/Ni-AC to highlight its superiority and feasibility in contaminants degradation. Results indicated that Fe/[email protected] with the core-shell structure possessed a higher oxidation resistance, electron transfer ability and oxygen utilization capacity. The degradation efficiency of 4-NCB was appreciably more significant than that of the Fe/Ni-AC system under diverse aeration conditions. This mainly was ascribed to the core-shell structure which reinforced the connection of dual-cathodes and anode and shortened the distance between zero-valent iron (Fe0) and zero-valent nickel (Ni0) for intensified electrons transfer. Electrons donated from Fe0 could enrich in high density on the surface of carbon. This high-density electronic release, on the one hand, could significantly promote the reduction of pollutants under N2. On the other hand, this enrichment realized the synergetic effect of reduction and oxidation in the absence of dissolved oxygen (DO). By combining the analysis of reduction intermediates, reactive oxidizing species and XPS, the reaction mechanisms of Fe/[email protected] under diverse aeration conditions were explored in-depth. These findings can contribute to the rational design of ternary micro-electrolysis systems with properties tailored to a variety of nitroaromatic organics in natural water remediation.
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