Fe/TiO2-x可见光活化过硫酸盐降解双酚A的作用机制

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摘要以TiO₂和FeCl₃为原料,通过水热-煅烧的方法成功制备了具有高可见光催化活性的Fe/TiO₂_-X催化剂并将其应用于催化活化过硫酸盐降解BPA的研究中.结果表明,研究体系具有优秀的催化氧化能力,BPA(50mg/L)的降解率在40min内达到100%,矿化度达到68.92%,研究同时对复合材料中有无Ti³⁺的自掺杂以及催化剂的投加量、PS浓度对体系降解有机物效能的影响进行了探究.该体系可通过自生光电子还原Fe³⁺实现三价铁和二价铁的高效循环.硫酸根自由基(SO₄^-•)和羟基自由基(•OH)为体系中主要的活性氧化物质,其中•OH贡献率超过66.2%.研究结果同时表明,碱性环境以及体系中的CO₃^2-对体系降解效能具有抑制作用.

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	付权超
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	刘沛华
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	金鹏康

关键词 ：有机微污染物降解, 过硫酸盐高级氧化, 可见光催化, Ti³⁺自掺杂TiO₂, Fe量子点

Abstract：In this study, TiO₂ and FeCl₃ was used as raw materials, Fe/TiO₂_-X catalysts with high visible light catalytic activity were successfully prepared by hydrothermal-calcination method and applied to the catalytic degradation of BPA by persulfate. The results showed that this system has excellent catalytic oxidation ability, the degradation rate of BPA (50mg/L) reached 100% in 40min, and the salinity reached 68.92%. At the same time, the effects of self-doped Ti³⁺ in the composite and the amount of catalyst and PS concentration on the degradation of organic compounds were studied. This system can realize the efficient cycle of trivalent iron and divalent iron by autogenic photoelectron reduction of Fe³⁺. Sulfate radical (SO₄^-•) and hydroxyl radical (•OH) were the main active oxidizing substances in the system, of which the contribution rate of •OH is more than 66.2%. The result also showed that alkaline environment and inorganic anions such as CO₃^2- had negative effect on the performance of the system.

Key words： degradation of organic micro-pollutants advanced persulfate oxidation visible-light photocatalysis Ti³⁺ self-doped TiO₂ Fe quantum dots

收稿日期: 2022-11-06

PACS:

X703.1

基金资助:国家自然科学基金资助项目(52100062,52070151);陕西省重点研发计划资助项目(2021ZDLSF05-06)

通讯作者: 金鹏康,教授,pkjin@hotmail.com E-mail: pkjin@hotmail.com

作者简介: 付权超(1997-),男,山西太原人,西安建筑科技大学硕士研究生,主要研究方向为污水深度处理与资源化利用.发表论文1篇.1260948008@qq.com

引用本文:

付权超, 许路, 刘沛华, 金鑫, 金鹏康. Fe/TiO₂_-_x可见光活化过硫酸盐降解双酚A的作用机制[J]. 中国环境科学, 2023, 43(6): 2841-2852. FU Quan-chao, XU Lu, LIU Pei-hua, JIN Xin, JIN Peng-kang. Characteristics and mechanism of bisphenol A degradation by persulfate activated by Fe/TiO₂_-_X under visible light. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2841-2852.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I6/2841

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