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- Title
Degradation of sulfamonomethoxine by iron–copper catalyst-activated persulfate.
- Authors
Wang, M.; Sun, J.; Zhai, H.; Zhang, Y.
- 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.
- Subjects
IRON; COPPER; ELECTRON paramagnetic resonance; EMERGING contaminants; REDUCTION potential; RADICALS (Chemistry); COPPER catalysts
- Publication
International Journal of Environmental Science & Technology (IJEST), 2024, Vol 21, Issue 11, p7631
- ISSN
1735-1472
- Publication type
Article
- DOI
10.1007/s13762-024-05517-8