4.7 Article

Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water

期刊

CHEMICAL ENGINEERING JOURNAL
卷 195, 期 -, 页码 248-253

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.04.084

关键词

Sulfamethazine; UV; Degradation; Sulfate radicals; pH; Intermediates

资金

  1. National Natural Science Foundation of China [51178321]
  2. National Major Project of Science & Technology Ministry of China [2008ZX07421-002]
  3. Research and Development Project of Ministry of Housing and Urban-Rural Development [2009-K7-4]

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Ultraviolet light (UV)/persulfate (S2O82-) oxidation of a pharmaceutically active compound, sulfamethazine (SMT), was studied in a stainless steel photo-reactor. During the treatment, UV photolytic S2O82- activation to produce highly reactive sulfate radicals (SO4 center dot-) to decompose SMT in water. The treatment was advantageous over direct photolysis or persulfate oxidation alone and UV/H2O2 oxidation, suggesting that SO4 center dot- is a very effective agent to remove SMT from water. Under the experimental conditions, the SMT degradation exhibited a pseudo-first-order reaction pattern. The degradation rate was influenced by the S2O82- dose and solution pH. Typically, a high persulfate dose could achieve a high SMT removal. In contrast, both the highest SMT degradation rate and the lowest mineralization degree were observed at pH 6.5, while the highest mineralization extent was accomplished at pH 11. The complex pH effect may be associated with the fact that the total radical concentration and fractions of the different radicals were varied with pH. Finally, the major SMT degradation products were identified, and the primary reaction pathways were proposed. This study demonstrated that UV/persulfate is a viable option for controlling SMT pollution in water. (c) 2012 Elsevier B.V. All rights reserved.

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