文献类型：期刊文献

英文题名：Fabrication of 3D Sponge@AgBr-AgCl/Ag and Tubular Photoreactor for Continuous Wastewater Purification under Sunlight Irradiation

作者：Kong, Weihang;Wang, Shilin;Wu, Di;Chen, Cuirong;Luo, Yusheng;Pei, Yuetian;Tian, Baozhu[1];Zhang, Jinlong

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：7

期号：16

起止页码：14051

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：;EI(收录号：20193407343774);WOS:【SCI-EXPANDED(收录号:WOS:000482173100045)】；

基金：This work has been supported by the National Natural Science Foundation of China (21573069, U1862112), Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), and the Programme of Introducing Talents of Discipline to Universities (B16017).

语种：英文

外文关键词：AgBr-AgCl/Ag; Melamine sponge; 3D structure; Fixed-bed photoreactor; Photocatalytic degradation; Dye; Antibiotics

摘要：Semiconductor photocatalysis is promising for the remediation of organic pollutants in environmental wastewater. At present, the main bottlenecks of relative research lie in how to more effectively improve the sunlight activity of photocatalysts and realize their reutilization. Herein, we assembled AgBr-AgCl/Ag on the skeletons of melamine sponge (MS) by immobilizing Ag nanowires (NWs) on MS skeletons, transferring Ag into AgBr-AgCl, and further reducing part Ag+ into metallic Ag. The microstructures of MS@AgBr-AgCl/Ag were characterized by the means of scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). It was found that AgBr-AgCl/Ag NWs were successfully loaded on the skeletons of MS to form a 3D structure, and there existed a composite structure between AgBr and AgCl. The transient photocurrents and electrochemical impedance analyses revealed that the AgBr-AgCl composite structure effectively decreased the impedance of charge carrier transfer, and consequently MS@AgBr-AgCl/Ag NWs displayed much higher photocurrent than MS@AgBr/Ag NWs and MS@AgCl/Ag NWs. The photocatalytic activities of the samples were evaluated by degrading antibiotic sulfadiazine (SD) and five organic dyes (fuchsin basic, methyl orange, acid orange 7, malachite green, and rhodamine B). Beneficial from the excellent visible-light response and charge carrier separation properties, MS@AgBr-AgCl/Ag NVVs displayed the optimal photocatalytic activity among these samples. Radical trapping experiments demonstrated that center dot O-2(-) and h(+) are the main reactive species responsible for organic contaminant degradation. Based on the results of high performance liquid chromatography-mass spectra (HPLC-MS), the possible structures of the main intermediates toward SD degradation were proposed. By filling MS@AgBr-AgCl/Ag NWs into glass tubes and connecting them together, we fabricated a tubular fixed-bed photoreactor for continuous wastewater purification. Overall, this work provides a reference for constructing visible light driven photocatalysts and fixed-bed photoreactors used for the environmental wastewater purification under sunlight irradiation.