Abstract
Sulfamonomethoxine (SMM) is an emerging organic pollutant that is environmentally persistent, highly toxic, and difficult to degrade, and there is an urgent need to develop efficient degradation methods. Therefore, this paper investigates the degradation of SMM using iron–copper catalyst-activated persulfate (PS). With an iron–copper catalyst amount of 1.5 g/L, initial sodium persulfate solution concentration of 2 mmol L−1, and initial solution pH = 7, the SMM removal rate reached approximately 99.7% after reaction for 2 h. When NO3− and Cl− coexisted in the system, the degradation efficiency of SMM (more than 99% at 2 h) did not change significantly. When SO42− was present in the system, the inhibition effect was insignificant (97.1% at 2 h). The presence of HCO3− and H2PO4− resulted in noticeable inhibitory effects, with SMM degradation rates of 47.4% and 76.8%, respectively. Electron paramagnetic resonance analysis showed that the radical that plays a dominant role in the degradation of SMM in this system is SO4−·, Cu(I), Cu(II), and Fe(II) activate PS to produce SO4−·, and some SO4−· is converted to ·OH with high redox potential. Therefore, it is assumed that the degradation pathway of SMM involves attack by SO4−· and ·OH, and the formation of corresponding intermediate products, which finally degrade to CO2, H2O, and other low-molecular-weight substances, thus achieving degradation.
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Acknowledgements
This project was supported by the National Natural Science Foundation of China (NSFC) (51809211). The Scientific Research Program Funded by Shaanxi Provincial Education Department (No.20JY045). The Natural Science Foundation of Shaanxi Province (2019JQ-745). The China Postdoctoral Science Foundation (2018M633548). And Guangdong Water Science and Technology Project(2015-06).
Funding
This project was supported by the National Natural Science Foundation of China (NSFC) (51809211). The Scientific Research Program Funded by Shaanxi Provincial Education Department (No.20JY045). The Natural Science Foundation of Shaanxi Province (2019JQ-745). The China Postdoctoral Science Foundation (2018M633548). Guangdong Water Science and Technology Project (2015-06).
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MW is a lecturer at the State Key Laboratory of Eco-hydraulic in Northwest Arid Region, Xi’an University of Technology, Xi’an, Shaanxi, PR China. JS is a master candidate of Environmental Science and Technology, State Key Laboratory of Eco-Hydraulics in Northwest Arid Zone, Xi’an University of Technology. HZ is a master candidate of Environmental Science and Technology, State Key Laboratory of Eco-Hydraulics in Northwest Arid Zone, Xi’an University of Technology. YZ is a PhD student of Environmental Science and Technology at the State Key Laboratory of Eco-hydraulic in Northwest Arid Region, Xi’an University of Technology, Xi’an, Shaanxi, PR China.
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Wang, M., Sun, J., Zhai, H. et al. Degradation of sulfamonomethoxine by iron–copper catalyst-activated persulfate. Int. J. Environ. Sci. Technol. (2024). https://doi.org/10.1007/s13762-024-05517-8
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DOI: https://doi.org/10.1007/s13762-024-05517-8