Heat-activated persulfate oxidation of sulfamethoxazole in water

Yu Qiong Gao, Nai Yun Gao, Yang Deng, Da Qiang Yin, Yan Sen Zhang, Wen Lei Rong, Sheng Dong Zhou

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21 Scopus citations

Abstract

Heat-activated persulfate to produce highly reactive sulfate radicals (Formula presented.) to oxidize sulfamethoxazole (SMX) in water was studied. The SMX degradation rate was significantly influenced by the reaction temperature, persulfate dose, initial pH, and co-existing anions. Higher temperature achieved higher degradation rate. The calculated activation energy for hot persulfate oxidation of SMX was approximately 130.93 kJ/mol. The degradation rate constant was proportional to the persulfate dose. An alkaline condition favored the SMX degradation. Effects of anions on the SMX degradation were species-dependent. Cl, (Formula presented.) , and (Formula presented.) inhibited the SMX degradation, to different degrees. In contrast, (Formula presented.) accelerated the treatment. The SMX decomposition was associated with hydroxylation, sulfonamide bond breakage, and oxidation of the amine groups. Toxicity tests revealed production of more toxic products. Therefore, appropriate post-treatments need to be considered to address the undesirable byproducts.

Original languageEnglish
Pages (from-to)2225-2233
Number of pages9
JournalDesalination and Water Treatment
Volume56
Issue number8
DOIs
StatePublished - 1 Jan 2015

Keywords

  • Factors
  • Heat-activated persulfate
  • Mechanism
  • Products
  • Sulfamethoxazole
  • Toxicity

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    Gao, Y. Q., Gao, N. Y., Deng, Y., Yin, D. Q., Zhang, Y. S., Rong, W. L., & Zhou, S. D. (2015). Heat-activated persulfate oxidation of sulfamethoxazole in water. Desalination and Water Treatment, 56(8), 2225-2233. https://doi.org/10.1080/19443994.2014.960471