化学
超纯水
羟胺
曝气
降级(电信)
环境修复
电化学
邻苯二甲酸二甲酯
选择性
激进的
高级氧化法
核化学
无机化学
化学工程
电极
催化作用
污染
有机化学
物理化学
工程类
生物
电信
计算机科学
生态学
邻苯二甲酸盐
作者
Dong Li,Jianguo Yu,Jialin Jia,Haiyang He,Wei Shi,Tao Zheng,Jun Ma
出处
期刊:Water Research
[Elsevier]
日期:2022-05-01
卷期号:214: 118167-118167
被引量:31
标识
DOI:10.1016/j.watres.2022.118167
摘要
To improve H2O2 generation and Fe3+/Fe2+ cycle simultaneously for enhancing Electro-Fenton performance, the electrode aeration (EA) and hydroxylamine sulfate (HA) were coupled. With dimethyl phthalate (DMP) as main target contaminant, combination of HA and EA greatly accelerated the degradation of DMP and exhibited a synergy in the pH of 2.0-6.9 through promoting the key reactions, including electrochemical two-electron reduction of O2 into H2O2 and redox cycles of Fe3+/Fe2+, which then improved the generation of hydroxyl radicals (·OH). The coupling EA and HA reduced the use of HA and converted most of HA into environment-friendly N2 (60.1-62.1% of HA products), while HA/solution aeration(SA) system consumed HA rapidly and the generated N2 only accounted for 5.8-6.7% of HA products. Furthermore, compared with HA/SA and EA Electro-Fenton systems, enhancement degree of DMP degradation in HA/EA Electro-Fenton process was higher in actual waterbody than in ultrapure water. The coupling EA and HA in the Electro-Fenton process could solve the low Fe3+/Fe2+ cycle efficiency and low H2O2 production simultaneously, and improve the N2 selectivity of HA transformation, which advanced its application in practical environmental remediation.
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