Efficient degradation of lindane in aqueous solution by iron (II) and/or UV activated peroxymonosulfate

Sanaullah Khan, Xuexiang He, Hasan M. Khan, Dominic Boccelli, Dionysios D. Dionysiou

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Degradation of lindane, a highly persistent and potentially carcinogenic pesticide, by iron (II) activated peroxymonosulfate (Fe2+/HSO5-) was investigated. The efficiency of this process was found to increase with UV light irradiation, probably due to an improved regeneration of Fe2+ for a fast generation of highly reactive OH and SO4-. A greater mineralization and dechlorination efficiency was also observed by UV/Fe2+/HSO5-, with a 92.2% total organic carbon removal and 96.4% chloride ion release after 180 min UV illumination. Removal of lindane by such a photochemical process was further promoted with increasing the initial concentration of either Fe2+ (10-1000 μM) or HSO5- (50-1000 μM). The initial degradation rate of lindane increased while the observed pseudo first-order rate constant (kobs) decreased with increasing the initial concentration of lindane. Higher pH (>4) resulted in a lower efficiency of UV/Fe2+/HSO5-, attributable to the complexation or precipitation of Fe2+/Fe3+. A Fe2+ level of 50 and 500 μM showed a comparable effect on lindane mineralization, probably due to the scavenging of SO4- and OH or the faster decomposition of the oxidant by excess Fe2+. Additionally, potential activation of Fe2+/HSO5- by fluorescence light was evaluated. Despite an enhanced degradation of lindane, no significant mineralization of lindane was observed. The results indicate that UV/Fe2+/HSO5- is effective and has a strong application potential for the degradation of lindane and other chlorinated pesticides.

Original languageEnglish (US)
Pages (from-to)37-43
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume316
DOIs
StatePublished - Feb 1 2016
Externally publishedYes

Keywords

  • Advanced oxidation processes (AOPs)
  • Iron (II)
  • Lindane
  • Mineralization
  • Peroxymonosulfate
  • UV irradiation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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