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Efficient photocatalysis of tetracycline hydrochloride (TC-HCl) from pharmaceutical wastewater using AgCl/ZnO/g-C3N4 composite under visible light: Process and mechanisms

文献类型： 外文期刊

作者： Ding, Chenman 1 ; Zhu, Qiurong 2 ; Yang, Bei 2 ; Petropoulos, Evangelos 3 ; Xue, Lihong 1 ; Feng, Yanfang 1 ; He, Shiying 1 ; Yang, Linzhang 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210018, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210018, Peoples R China

3.Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

4.Nanjing Univ Sci & Technol, Sch Chem & Chem Engn, Nanjing 210018, Peoples R China

关键词： Photocatalyst; Tetracycline degradation; Pharmaceutical wastewater; C3N4 composites; Degradation pathway

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：6.796； 五年影响因子：6.127 ）

ISSN： 1001-0742

年卷期： 2023 年 126 卷

页码：

收录情况： SCI

摘要： AgCl/ZnO/g-C3N4, a visible light activated ternary composite catalyst, was prepared by combining calcination, hydrothermal reaction and in-situ deposition processes to treat/photocatalyse tetracycline hydrochloride (TC- HCl) from pharmaceutical wastewater under visible light. The morphological, structural, electrical, and optical features of the novel photocatalyst were characterized using scanning electron microscopy (SEM), UV-visible light absorption spectrum (UV-Vis DRS), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and transient photocurrent techniques. All analyses confirmed that the formation of heterojunctions between AgCl/ZnO and g-C3N4 significantly increase electron-hole transfer and separation compared to pure ZnO and g-C3N4. Thus, AgCl/ZnO/g-C3N4 could exhibit superior photocatalytic activity during TC-HCl assays (over 90% removal) under visible light irradiation. The composite could maintain its photocatalytic stability even after four consecutive reaction cycles. Hydrogen peroxide (H2O2 ) and superoxide radical (O-2) contributed more than holes (h(+)) and hydroxyl radicals (center dot OH) to the degradation process as showed by trapping experiments. Liquid chromatograph-mass spectrometer (LC-MS) was used for the representation of the TC-HCl potential degradation pathway. The applicability and the treatment potential of AgCl/ZnO/g-C3N4 against actual pharmaceutical wastewater showed that the composite can achieve removal efficiencies of 81.7%, 71.4% and 69.0% for TC-HCl, chemical oxygen demand (COD) and total organic carbon (TOC) respectively. AgCl/ZnO/g-C3N4 can be a prospective key photocatalyst in the field of degradation of persistent, hardly-degradable pollutants, from industrial wastewater and not only. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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