Thiosulfate Enhanced Cu(II)-Catalyzed Fenton-Like Reaction at Neutral Condition: Critical Role of Sulfidation in Copper Cycle and Cu(III) Production

作     者：Li, Nan Liu, Tongcai Xiao, Shaoze Yin, Wenjun Zhang, Longlong Chen, Jiabin Wang, Yayi Zhou, Xuefei Zhang, Yalei 

作者机构：State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Sulfur compounds 

摘      要：Thiosulfate (S2O32-) have been proven to be an effective promoter of Fenton-like reactions by accelerating the metal ions cycle. However, up to now, there is little information about the role of sulfur transformation and intermediate sulfur in the regulation of metal chemical cycle and reactive species production. Herein, free Cu(II) was selected as catalyst for the activation of H2O2. The introduction of S2O32- significantly enhanced the degradation of benzoic acid, which was 5.8 times higher than that of Cu(II)/H2O2 system. The kinetic model was developed to reveal the transformation of sulfur species and demonstrate that sulfides (i.e., HS-/S2-, S0 and S2O32-) were the dominant electron donor for the reduction of Cu(II) into Cu(I). Consequently, the reduction and complexation roles of S2O32- significantly resolve the rate-limiting step and broaden the pH range of in Fenton-like reactions. Evidence for the critical role of high-valent copper (Cu(III)) and HO• on BA degradation was obtained by scavengers experiments, electron paramagnetic resonance and fluorescent probes. Meanwhile, the Cu(II)/H2O2/S2O32- system also exhibited satisfactory anti-interference ability of the various matrix. Overall, this study offer mechanistic insight into sulfidation in Cu chemical cycle and Cu(III) generation, and highlight the potential of S2O32- for Fenton-like reactions to control pollutants. © 2022, The Authors. All rights reserved.