Study of the photocatalytic degradation pathway of norfloxacin and mineralization activity using a novel ternary Ag/AgCl-CeO2 photocatalyst
Study of the photocatalytic degradation pathway of norfloxacin and mineralization activity using a novel ternary Ag/AgCl-CeO2 photocatalyst
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新型三元Ag/AgCl-CeO2光催化剂研究诺氟沙星的光催化降解途径和矿化活性
DOI：
10.1016/j.jcat.2017.08.028
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发表时间：
2017-11
影响因子：
7.3
通讯作者：
Guang-Ming Zeng
中科院分区：
文献类型：
--
作者：
Xiao-Ju Wen;Cheng-Gang Niu;Da-Wei Huang;Lei Zhang;Chao Liang;Guang-Ming Zeng
本研究首先通过尿素水解和煅烧制备CeO 2。采用原位插层法将AgCl负载于CeO 2上，然后将AgCl光还原为Ag，制备了Ag/AgCl-CeO 2复合光催化剂。在可见光照射下，Ag/AgCl-CeO 2复合材料对诺氟沙星（NOF）的光催化降解具有较好的光催化活性。通过LC-MS分析提出了NOF的合理降解途径。三维荧光光谱（3D EEMs）和总有机碳（TOC）分析表明，Ag/AgCl-CeO 2复合材料对NOF分子具有较强的矿化能力。瞬态光电流响应、PL谱和EIS表明，Ag/AgCl-CeO 2杂化复合材料具有较高的光生电荷分离效率。活性物种捕获实验和ESR技术证实，h+和dotO 2 −是参与有机污染物光降解的主要活性基团。结合各种性能表征和实验结果，提出了可能的光催化机理。此外，催化剂在四个连续循环中显示出优异的可重复使用性和稳定性。Ag/AgCl-CeO 2杂化复合材料有望作为光催化剂用于能源转化和环境修复。这项工作也可以为NOF的降解途径提供更深入的了解。
In this study, CeO2first was prepared via urea hydrolysis and calcination. Ag/AgCl–CeO2composite photocatalysts were fabricated by in situ interspersal of AgCl on CeO2and subsequent photoreduction of AgCl to Ag. The Ag/AgCl–CeO2composites exhibited enhanced photocatalytic activity for the photodegradation of norfloxacin (NOF) under visible light irradiation. A plausible degradation pathway for NOF was proposed via LC-MS analysis. The Ag/AgCl–CeO2composites exhibited effective mineralization ability toward the NOF molecule degradation based on three-dimensional excitation–emission matrix fluorescence spectroscopy (3D EEMs) and total organic carbon (TOC) analysis. Transient photocurrent response, PL spectrum, and EIS indicate higher photoinduced charge separation efficiency in Ag/AgCl–CeO2hybrid composites. Active species trapping experiments and an ESR technique confirmed that h+andradical dotO2−were the main active groups involved in photodegradation of organic pollutants. Through the combination of various performance characterization and experimental results, a possible photocatalytic mechanism was proposed. Furthermore, the catalysts displayed excellent reusability and stability in four consecutive cycles. It is expected that the Ag/AgCl–CeO2hybrid composites could be used as photocatalysts for energy conversion and environmental remediation. This work can also provide a deeper understanding of the degradation pathway for NOF.
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影响因子：
22.1
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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