Photo-Fenton degradation of oxytetracycline by g-C3N4/CQDs/FeOCl with in-situ hydrogen peroxide production: Degradation pathway and toxicity analysis of intermediate products

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-22 DOI:10.1016/j.jwpe.2024.106615

Na Zheng, Jiating Shi, Lijun Nie, Kunkun Xue, Yuhang Gao, Jianhui Shi

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引用次数: 0

Abstract

Heterogeneous photocatalytic Fenton technology, as an advanced oxidation process (AOPs), is considered a promising method for treating antibiotic wastewater. In the article, a heterogeneous photo-Fenton system g-C₃N₄/CQD/FeOCl with in-situ H₂O₂ production was constructed and used for photo-Fenton degradation of oxytetracycline (OTC). The successful preparation of Z-scheme heterojunction photocatalyst g-C₃N₄/CQDs/FeOCl was proved by a series of characterizations. The optimal degradation efficiency of OTC could reach as high as 96 %, basically achieving the effect of traditional Fenton reaction. Importantly, the degradation mechanism result demonstrated that ^•OH was the most active species for the degradation of OTC, and most of it were generated by the Fenton reaction within the constructed system. In addition, the main degradation pathways of OTC were detected by liquid chromatography-mass spectrometry. The three-dimensional fluorescence and toxicity analysis of the intermediate products showed that OTC was decomposed into intermediate products with smaller molecular weight, and the biological toxicity was reduced. This study provides new ideas for improving the application of Fenton reaction in wastewater treatment.

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g-C3N4/CQDs/FeOCl 对土霉素的光-芬顿降解，并在原位产生过氧化氢：降解路径和中间产物的毒性分析

作为一种高级氧化工艺（AOPs），异相光催化 Fenton 技术被认为是一种处理抗生素废水的有效方法。文章构建了一个原位产生 H2O2 的 g-C3N4/CQD/FeOCl 异相光催化 Fenton 系统，并将其用于光催化 Fenton 降解土霉素（OTC）。一系列表征结果证明了 Z 型异质结光催化剂 g-C3N4/CQDs/FeOCl 的成功制备。OTC 的最佳降解效率高达 96%，基本达到了传统 Fenton 反应的效果。重要的是，降解机理结果表明，-OH 是降解 OTC 的最活跃物种，其中大部分是在所构建的体系中通过 Fenton 反应生成的。此外，液相色谱-质谱法检测了 OTC 的主要降解途径。中间产物的三维荧光和毒性分析表明，OTC 被分解成分子量更小的中间产物，生物毒性降低。这项研究为改进 Fenton 反应在废水处理中的应用提供了新思路。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies