Insights into Periodate Oxidation of Antibiotics Mediated by Visible-Light-Induced Polymeric Carbon Nitride: Performance and Mechanism

作     者：Chen, Yi Yuan, Xingzhong Jiang, Longbo Zhao, Yanlan Chen, Haoyun Wang, Hou 

作者机构：College of Environmental Science and Engineering Hunan University Changsha410082 China Key Laboratory of Environment Biology and Pollution Control Hunan University Ministry of Education Changsha410082 China Institute of Resources and Environment Hunan University of Technology and Business Changsha410205 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Carbon nitride 

摘      要：Periodate (PI)-based advanced oxidation processes (AOPs) have drawn growing attention in an effort to alleviate pollutants issues in the aqueous environment. Different from previous use of ultraviolet light or metal catalysts, this study proposes a novel system for the visible-light-assisted activation of PI via metal-free polymeric carbon nitride (CN). The best catalytic effect is achieved by CN synthesized from urea (UCN). Using the UCN/PI/Vis system, it was demonstrated that the effective charge separation predominately causes kinetic increase in photocatalytic degradation. In the whole system, UCN and organic pollutant functioned as the electron donor, while PI acted as the activated electron acceptor. By obtaining electrons from the conduction band, PI inhibits charge carriers from complexing and makes holes available for contaminants to oxidize. The tetracycline effectively underwent nearly 100% removal within 10 min and the corresponding kobs attained 0.40839 min-1 . Besides, outstanding catalytic performance in a broad range of pH (2.99-11.01) was confirmed. Meanwhile, the UCN/PI/Vis system demonstrated favorable immunity to common wastewater components, good stability, and reusability. The prominent active species for TC degradation were 1O2 and iodate radical (IO3·, IO4·), followed by O2•- . This study establishes a precedent for visible-light-induced activation of PI by UCN, and interfacial electron transfer occurs in a synergistic process, and greatly accelerated photocatalytic oxidation is accomplished with PI acting as an electron scavenger. © 2022, The Authors. All rights reserved.