The Overlooked Role of Co(Oh)2 in Co3o4 Activated Pms System: Suppression of Co2+ Leaching and Enhanced Degradation Performance of Antibiotics

作     者：Wang, Hongjie Chen, Guanhan Dong, Wenyi Ding, Wenhui Wang, Feifei Zhao, Zilong Huang, Yuxiong 

作者机构：School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China Tsinghua-Berkeley Shenzhen Institute Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Graphene 

摘      要：Cobalt oxide (Co 3 O 4 ) activated peroxymonosulfate (PMS) system was extensively studied due to its excellent catalytic performance. However, the relatively high cobalt (Co 2+ ) leaching (up to 2 mg/L) would pose high ecotoxicological risks. Herein, we identified the existence of Co(OH) 2 on the surface of Co 3 O 4 were the major source of Co 2+ leaching in the Co 3 O 4 activated PMS system. Furthermore, the Co 2+ leaching was effectively suppressed by converting Co(OH) 2 to Co 3 O 4 via pyrolysis treatment. In addition, reduced graphene oxide (rGO) was engaged to enhance the degradation performance of antibiotics in the Co 3 O 4 activated PMS system. The oxygen functionalities of rGO would catalyze PMS to generate sulfate radicals (SO 4 - ·) and trigger the non-radical pathway of singlet oxygen ( 1 O 2 ). We have achieved outstanding catalytic performance for carbamazepine (CAZ) degradation with low Co 2+ leaching, as CAZ (5 mg/L) could be completely degraded in 30 min. Combining experimental investigation and theoretical calculation, we also revealed the degradation pathways and mechanisms that CAZ would be oxidized and detoxified by 1 O 2 and SO 4 - ·. We have provided a simple approach to inhibit the Co 2+ leaching and enhance the catalytic performance of Co 3 O 4 activated PMS system for the effective control of antibiotics. © 2022, The Authors. All rights reserved.