A novel Z-Scheme CdS/Bi3O4Cl heterostructure for photocatalytic degradation of antibiotics: Mineralization activity, degradation pathways and mechanism insight
A novel Z-Scheme CdS/Bi3O4Cl heterostructure for photocatalytic degradation of antibiotics: Mineralization activity, degradation pathways and mechanism insight
复制标题
一种用于光催化降解抗生素的新型 Z 型 CdS/Bi3O4Cl 异质结构：矿化活性、降解途径和机制见解
DOI：
10.1016/j.jtice.2018.05.004
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发表时间：
2018-10-01
影响因子：
5.7
通讯作者：
Li, Chunmei
中科院分区：
文献类型：
--
作者：
Che, Huinan;Che, Guangbo;Li, Chunmei
采用无表面活性剂的方法制备了新型Z-Scheme CdS/Bi3O4Cl异质结构光催化剂，并对其降解环丙沙星（CIP）和四环素（TC）的可见光催化活性进行了研究。对于CIP的降解，Z-Scheme CdS/Bi3O4Cl-50异质结构表现出最优的速率常数(k(app) = 0.0151 min(-1))，分别是纯Bi3O4Cl (k（app) = 0.00142 min(-1)）和CdS (k（app) = 0.00764 min(-1)）的10.63和1.97倍。同时，正如预期的那样，Z-Scheme CdS/Bi3O4Cl-50异质结构对TC的降解速率常数也最高（0.0643 min(-1)），分别是裸CdS （0.0301 min(-1)）和Bi3O4Cl （0.0148 min(-1)）的2.14倍和4.34倍。光催化活性的增强是由于光电流和电化学阻抗谱（EIS）测量证明了载流子转移和分离的显著改善。通过HPLC-MS分析，提出了CIP和TC可能的降解途径。通过总有机碳（TOC）测试分析，与纯CdS纳米球和Bi3O4Cl纳米片相比，Z-Scheme CdS/Bi3O4Cl异质结构对CIP和TC分子降解表现出优异的矿化能力。此外，通过活性物质捕获实验和ESR技术研究了可见光下Z-Scheme CdS/Bi3O4Cl异质结构的光催化机理。本研究为构建z型异质结光催化剂提供了新的途径，并对其矿化活性、可能的降解途径和光催化机理有了更深入的了解。（三）2018年台湾省化学工程师学会。Elsevier B.V.版权所有。
A novel Z-Scheme CdS/Bi3O4Cl heterostructure photocatalysts are fabricated by a facile surfactant-free method, and the visible-light-driven photocatalytic activity has been investigated for degradation of ciprofloxacin (CIP) and tetracycline (TC). For degradation of CIP, the Z-Scheme CdS/Bi3O4Cl-50 heterostructure displays the optimal rate constant (k(app) = 0.0151 min(-1)), which is about 10.63 and 1.97 times higher than that of pure Bi3O4Cl (k(app) = 0.00142 min(-1)) and CdS (k(app) = 0.00764 min(-1)), respectively. Meanwhile, as expected, the rate constant of Z-Scheme CdS/Bi3O4Cl-50 heterostructure also displays the highest (0.0643 min(-1)) for degradation of TC, which is 2.14 times and 4.34 times as high as those of the bare CdS (0.0301 min(-1)) and Bi3O4Cl (0.0148 min(-1)), respectively. The enhancement of phototcatalytic activity is ascribed to the significant improved transfer and separation of charge carriers, which are proved by photocurrent and electrochemical impedance spectra (EIS) measurements. The possible degradation pathway for CIP and TC are proposed based on the HPLC-MS analysis. Compared with pure CdS nanospheres and Bi3O4Cl nanosheets, the Z-Scheme CdS/Bi3O4Cl heterostructures exhibit the excellent mineralization ability towards the CIP and TC molecules degradation through the analysis of the total organic carbon (TOC) tests. Moreover, the photocatalytic mechanism over Z-Scheme CdS/Bi3O4Cl heterostructure under visible light irradiation is investigated by active species trapping experiments and ESR technology. The present work provides a new approach to construct Z-Scheme heterojunction photocatalysts and a deeper insight for the mineralization activity, possible degradation pathways and photocatalytic mechanism. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.