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Active-chlorine-mediated oxidation of 5-fluorouracil on a hierarchically ordered macroporous RuO2 electrode

文献类型： 外文期刊

作者： Liu, Ruiqian 1 ; Wang, Lu 2 ; Wu, Ruiqin 3 ; Liu, Siqi 2 ; Korshin, Gregory V. 4 ; Han, Weiqing 2 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210018, Peoples R China

2.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Key Lab Jiangsu Prov Chem Pollut Control & Resourc, Nanjing 210094, Peoples R China

3.Beijing Xinzhiheng Technol HoldIngsCO LTD, Beijing 10080, Peoples R China

4.Univ Washington, Dept Civil & Environm Engn, Seattle, WA 98195 USA

关键词： Hierarchically ordered macroporous structure; Active-chlorine-mediated oxidation; 5-Fluorouracil; Pharmaceutical; RuO2 electrode

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 301 卷

页码：

收录情况： SCI

摘要： A hierarchically ordered macroporous RuO2 electrode (HOM-RuO2) was fabricated to enhance in situ active chlorine production in an electrochemical system intended for treatment of pharmaceutical active compounds (PhACs). The unique structure of HOM-RuO2 resulted in a decrease of the chlorine evolution potential, a large electro-active area available for in situ conversion of Cl to active chlorine, and hence improved the active chlorine production by 40%. 5-Fluorouracil (5-FU) was used as a target pollutant to explore the performance of the HOM-RuO2 for PhACs degradation based on the in situ generated active chlorine. The results showed that the reaction rate of active-chlorine-mediated oxidation of 5-FU produced using the HOM-RuO2 was 18.4 times higher than that in the case of hydroxyl radicals (OH)-initiated oxidation using a PbO2 electrode at 30 mA cm-2. The effects of current density and initial solution pH on the 5-FU removal were investigated. The mechanism of 5-FU degradation was proposed taking into accounts both active chlorine production, and change of the speciation of 5-FU caused by pH variations. The dominant degradation products observed for the degradation of 5-FU using the HOM-RuO2 were lactic acid, propanol, acetic acid, urea and other small molecules, but no chlorinated products were detected. These study demonstrates the promise of the HOM-RuO2-based electrochemical systems for the active-chlorine-mediated treatment of recalcitrant pharmaceuticals found in wastewater.

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