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

Yu qiong Gao, Nai yun Gao, Yang Deng, Yi qiong Yang, Yan Ma

Research output: Contribution to journalArticleResearchpeer-review

219 Citations (Scopus)

Abstract

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-) to decompose SMT in water. The treatment was advantageous over direct photolysis or persulfate oxidation alone and UV/H 2 O 2 oxidation, suggesting that SO4- 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.

Original languageEnglish
Pages (from-to)248-253
Number of pages6
JournalChemical Engineering Journal
Volume195-196
DOIs
StatePublished - 1 Jul 2012

Fingerprint

Sulfamethazine
oxidation
Degradation
Oxidation
degradation
Water
mineralization
pH effects
photolysis
water
Photolysis
steel
sulfate
pollution
Pollution
Stainless steel
Chemical activation
Ultraviolet Rays
Stainless Steel
rate

Keywords

  • Degradation
  • Intermediates
  • PH
  • Sulfamethazine
  • Sulfate radicals
  • UV

Cite this

Gao, Yu qiong ; Gao, Nai yun ; Deng, Yang ; Yang, Yi qiong ; Ma, Yan. / Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water. In: Chemical Engineering Journal. 2012 ; Vol. 195-196. pp. 248-253.
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abstract = "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-) to decompose SMT in water. The treatment was advantageous over direct photolysis or persulfate oxidation alone and UV/H 2 O 2 oxidation, suggesting that SO4- 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.",
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Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water. / Gao, Yu qiong; Gao, Nai yun; Deng, Yang; Yang, Yi qiong; Ma, Yan.

In: Chemical Engineering Journal, Vol. 195-196, 01.07.2012, p. 248-253.

Research output: Contribution to journalArticleResearchpeer-review

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