Degradation of ciprofloxacin in aqueous bismuth oxybromide (BiOBr) suspensions under visible light irradiation: A direct hole oxidation pathway
Degradation of ciprofloxacin in aqueous bismuth oxybromide (BiOBr) suspensions under visible light irradiation: A direct hole oxidation pathway
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可见光照射下溴氧化铋 (BiOBr) 水悬浮液中环丙沙星的降解：直接空穴氧化途径
DOI：
10.1016/j.cej.2015.03.077
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发表时间：
2015-08
影响因子：
15.1
通讯作者：
Chen, Chuncheng
中科院分区：
文献类型：
--
作者：
Jia, Manke;Wang, Shulian;Huang, Yingping;Chen, Chuncheng
天然水体中的环丙沙星(CIP)具有很强的生物活性，已造成严重的环境问题。本研究以溴化铋(BiOBr光)为光催化剂，研究了可见光对CIP的降解作用。采用水热法合成了片状BiOBR，并用X射线粉末衍射、扫描电子显微镜和UV-Vis漫反射光谱对其进行了表征。用高效液相色谱法对降解过程进行了监测。采用高效液-质联用法对光解中间体进行了鉴定，并在产物分析的基础上提出了降解途径。研究发现，在可见光诱导降解BiOBR上的CIP时，CIP的哌嗪部分是主要的反应中心，而喹诺酮类和环丙烷环基本保持不变。反应速率与pH的关系、产物分析和理论计算表明，表面反应机理是CIP氧化以直接空穴氧化过程为主，而高级氧化过程中常见的活性物种--自由基dotOH在可见光诱导的BiOBR光催化过程中不起作用。研究表明，CIP是揭示价带具有中等氧化能力的光催化剂光降解机理的良好模型衬底。
Ciprofloxacin (CIP) in natural waters has caused serious environmental problems because of its potent biological activity. In this study, the visible light-induced degradation of CIP was examined by using bismuth oxybromide (BiOBr) as photocatalyst. The flake-shape BiOBr was synthesized by hydrothermal method and characterized by X-ray powder diffraction, scanning electron microscopy and UV–vis diffuse reflectance spectroscopy. The degradation process was monitored by high performance liquid chromatography. The photodegraded intermediates were identified by high performance liquid chromatography–mass spectrometry and the degradation pathway was proposed on the basis of product analysis. It was found that, during the visible light induced degradation of CIP on BiOBr, the piperazine moiety of CIP was the predominant reaction sites, while the quinolone and cyclopropane rings remained essentially intact. The pH-dependence of reaction rates, product analysis and theoretical calculation pointed to a surface reaction mechanism that the CIP oxidation is dominant by the direct hole oxidation process, whereasradical dotOH, which is the common active species in the advance oxidation processes, is not effective in the visible light induced photocatalytic process on BiOBr. This study demonstrated that CIP is a good model substrate to uncover the photodegradation mechanism for photocatalyst whose valence band has moderate oxidation ability.
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影响因子：
8.8
作者：
Balcioglu, IA;Ötker, M
通讯作者：
Ötker, M
影响因子：
--
作者：
DOMENECH, J;PRIETO, A
通讯作者：
PRIETO, A
快速分辨液相色谱-电喷雾电离串联质谱法同时测定各种环境基质中的人用和兽用抗生素
影响因子：
4.1
作者：
Zhou, Li-Jun;Ying, Guang-Guo;Zhang, Qian-Qian
通讯作者：
Zhang, Qian-Qian
BiOBr 在光催化降解水中微囊藻毒素-LR 时使 D-Glu 和 D-MeAsp 脱羧的独特能力
影响因子：
11.4
作者：
Fang Yanfen;Huang Yingping;Cheng Genwei
通讯作者：
Cheng Genwei
松弛 BiOX (X = F, Cl, Br, I) 光催化剂的电子结构
影响因子：
3.3
作者：
Huang, Wen Lai;Zhu, Qingshan
通讯作者：
Zhu, Qingshan