Exploring a broadened operating pH range for norfloxacin removal via simulated solar-light-mediated Bi_2WO_6 process

作     者：Meijuan Chen Yu Huang Wei Chu 陈美娟;黄宇;朱威

作者机构：School of Human Settlements and Civil Engineering Xi’an Jiaotong University Xi’an 710049 Shaanxi China State Key Laboratory of Loess and Quaternary Geology (SKLLQG) Key Laboratory of Aerosol Chemistry & Physics Institute of Earth EnvironmentChinese Academy of Sciences Xi’an 710061 Shaanxi China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong China 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2019年第40卷第5期

页      面：673-680页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Science Foundation of China(41877481,41503102) the open project of the State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Science(SKLLQG1729) the China Postdoctoral Science Foundation(2018M643669) the Fundamental Research Funds for the Central Universities(2018249) the "Hundred Talent Program" of the Chinese Academy of Sciences~~ 

主　　题：Bismuth tungstate Broadened operating pH Norfloxacin Photocatalysis Water 

摘      要：Semiconductor photocatalysis can be operated over a narrow pH range for wastewater treatment. In this study, a simulated solar-light-mediated bismuth tungstate (SSL/Bi2WO6) process is found to be effective for norfloxacin degradation over a narrow pH range. To broaden the operating pH range of the SSL/Bi2WO6 process, an NH4+ buffer system and an Fe3+ salt were introduced under extremely basic and acidic pH conditions, respectively. The NH4+ buffer system continuously supplied hydroxyl ions to generate ·OH radicals and prevented acidification of the solution, resulting in improved norfloxacin removal and mineralization removal under alkaline conditions. In contrast, the Fe3+ salt offered an additional homogeneous photo-sensitization pathway. The former treatment assisted in norfloxacin decay and the latter increased the collision frequency between the photo-generated hole and hydroxyl ions. Moreover, the effect of parameters such as pH and Fe3+ dosage was optimized.