催化作用
哌嗪
化学
吸附
废水
羟基化
氢氧化物
阳极
降级(电信)
金属
核化学
无机化学
有机化学
电极
废物管理
物理化学
计算机科学
酶
电信
工程类
作者
Chengye Sun,Jun Wang,Cheng Gu,Chao Wang,Shuai Sun,Peipei Song
标识
DOI:10.1016/j.cej.2022.139592
摘要
Recently, heavy metal-antibiotic complexes have been frequently detected in wastewater, posing a serious threat to the human health. In this study, a novel combination of heterogeneous electro-Fenton (hetero-EF) and electrocoagulation process was developed for efficient removal of Cu-ciprofloxacin complexes (Cu-CIP). As hetero-EF cathode catalyst, N doped porous carbon loaded with Co/Fe sites (N-Co/Fe-PC) was innovatively synthesized, and Fe/CoNC structure was formed. The homogeneous mixing of Fe3C and Co3Fe7 resulted in the electron transfer and accumulation on Fe3C, which optimized the active substance and facilitated the oxygen reduction reaction. The effects of current, electrolyte type, pH, and concentration were comprehensively investigated, and the optimum removal efficiency of Cu, CIP, and TOC were 99.69 %, 96.40 %, and 83.62 %, respectively. Besides, it revealed that ·O2– was the dominant contributor to the Cu-CIP degradation. As a result, Cu-CIP complexes were degraded into small molecules and released Cu2+ with the ring-opening demethylation of the piperazine ring, cleavage and demethylation of carboxyl group, hydroxylation of the piperazine ring, and β-cleavage reactions of cyclopropyl group. Meanwhile, they were also adsorbed by aluminum hydroxide/hydroxyl oxides especially γ-AlOOH generated from the anode and finally coprecipitated. This study will provide a novel technology and theoretical basis for enhanced degradation of heavy metal-antibiotic complexes from wastewater.
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