Elimination of miconazole nitrate from water by electro-Fenton: effect of operating parameters and degradation pathway†

IF 3.1 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Nadia Gadi, Allisson Barros de Souza, Nadine C. Boelee, Deirdre Cabooter and Raf Dewil
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Abstract

This study investigates the removal of miconazole, a widely used pharmaceutical, from water using the electro-Fenton process. By systematically evaluating key parameters such as applied current intensity (10–500 mA), catalyst concentration (0.1–1.0 mM Fe2+), and water matrix composition, optimal conditions for maximizing pollutant removal efficiency were identified. The highest first-order oxidation rate constant of 36.4 × 10−2 min−1 was achieved under optimal conditions, demonstrating the efficiency of the electro-Fenton process. Total organic carbon (TOC) removal reached a maximum of 90% after 180 min of treatment, indicating significant mineralization of the pollutant. Ten major aromatic oxidation intermediates were identified using ultra-high-performance liquid chromatography coupled with high-resolution mass spectrometry (UHPLC-HRMS), providing valuable insight into the degradation pathways. This study stands out for its comprehensive optimization of key parameters, ensuring robust and practical application of the electro-Fenton process for pharmaceutical removal. Achieving 90% TOC removal and a high oxidation rate constant (36.4 × 10−2 min−1) demonstrates superior mineralization efficiency. The identification of ten major degradation intermediates via UHPLC-HRMS provides valuable insight into pollutant breakdown pathways. Additionally, by considering real water matrix effects, this work enhances the practical applicability of electro-Fenton in sustainable wastewater treatment. The obtained results highlight the electro-Fenton process as an effective and promising technology for the removal and mineralization of pharmaceutical contaminants from water, contributing to the advancement of sustainable wastewater treatment solutions.

Abstract Image

电fenton法去除水中硝酸咪康唑:操作参数及降解途径的影响
研究了电fenton法去除水中广泛使用的药物咪康唑。通过系统评估关键参数,如施加电流强度(10-500 mA)、催化剂浓度(0.1-1.0 mM Fe2+)和水基质组成,确定了最大限度地提高污染物去除效率的最佳条件。在最佳条件下,电- fenton工艺获得了最高的一阶氧化速率常数36.4 × 10−2 min−1,证明了电- fenton工艺的有效性。处理180 min后,总有机碳(TOC)去除率最高可达90%,表明污染物矿化效果显著。利用超高效液相色谱-高分辨率质谱(UHPLC-HRMS)鉴定了10种主要的芳香族氧化中间体,为降解途径提供了有价值的见解。本研究的突出之处是对关键参数进行了全面优化,确保了电fenton工艺在药物去除中的稳健和实际应用。达到90%的TOC去除率和较高的氧化速率常数(36.4 × 10−2 min−1)表明了优异的矿化效率。通过UHPLC-HRMS鉴定十种主要降解中间体为污染物分解途径提供了有价值的见解。此外,通过考虑真实的水基质效应,本工作增强了电fenton在可持续废水处理中的实际适用性。所获得的结果强调了电fenton工艺是一种有效且有前途的去除水中药物污染物和矿化的技术,有助于推进可持续的废水处理解决方案。
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来源期刊
Environmental Science: Water Research & Technology
Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES
CiteScore
8.60
自引率
4.00%
发文量
206
期刊介绍: Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.
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