The pH-dependent degradation of sulfadiazine using natural siderite activating PDS: The role of singlet oxygen

Fuwei Sun; Tianhu Chen; Haibo Liu; Xuehua Zou; Peixun Zhai; Ziyang Chu; Daobing Shu; Hanlin Wang; Dong Chen

doi:10.1016/j.scitotenv.2021.147117

The pH-dependent degradation of sulfadiazine using natural siderite activating PDS: The role of singlet oxygen

Sci Total Environ. 2021 Aug 25:784:147117. doi: 10.1016/j.scitotenv.2021.147117. Epub 2021 Apr 16.

Authors

Fuwei Sun¹, Tianhu Chen¹, Haibo Liu², Xuehua Zou¹, Peixun Zhai¹, Ziyang Chu¹, Daobing Shu¹, Hanlin Wang¹, Dong Chen¹

Affiliations

¹ Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China.
² Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China. Electronic address: liuhaibosky116@hfut.edu.cn.

PMID: 33895517
DOI: 10.1016/j.scitotenv.2021.147117

Abstract

Occurring naturally siderite (FeCO₃) was used as the heterogeneous catalyst to activate peroxodisulfate (PDS) for the degradation of sulfadiazine under different initial pH values. The findings of this system exhibited various ROS (e.g. ¹O₂, SO₄^- and OH) present during a wide range of pH values. Among them, ¹O₂ could significantly facilitate the initial degradation rate, and the increased pH enhanced the role of ¹O₂. The factors including initial pH values, siderite dosage, PDS concentration, initial contaminants concentration, and water matrix were discussed. The role of each ROS was investigated through quenching test and electron paramagnetic resonance (EPR). Furthermore, the comprehensive degradation process was proposed based on the LC-MS results. And the cycle test demonstrates the reusability of siderite at a pH of 3. Accordingly, this study is of great significance for understanding the degradation of such sulfonamide pollutants in the siderite/PDS system.

Keywords: Mechanism; Peroxydisulfate (PDS); Siderite; Singlet oxygen; pH-dependent.