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Comparative studies on the oxidative dechlorination of chlorophenols by a superoxide complex

  • Bula Singh
  • Ranendu Sekhar Das
  • Arabinda Mandal
Article
  • 6 Downloads

Abstract

The chlorophenols (CPs), 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP), are potent environmental hazards. They can be dechlorinated to safer products by reacting them with the Co(III)-bound superoxo complex [(NH3)5Co(µ-O2)Co(NH3)5]5+ (1). In acidic media, the redox reactions between 1 and all three CPs follow a first-order process and the observed rate constant ko values increase with increasing concentrations of CPs and pH of the medium. Our observations suggest that the deprotonated forms of the CPs are ~ 105 times more reactive than the protonated forms, and the reactions proceed via a common free radical mechanism. Initially, the CP molecules undergo 2-e oxidations by complex 1 to generate phenolic radicals, which then form unstable quinones. Through the aromatic ring opening, the latter intermediates finally degrade to different products. The reactivity order for these CPs is 4-CP ≈ 2,4,6-TCP > 2,4-DCP.

Supplementary material

11243_2018_273_MOESM1_ESM.docx (635 kb)
Supplementary material 1 (DOCX 635 kb)

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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Department of ChemistryVisva-BharatiSantiniketanIndia
  2. 2.Department of ChemistryRanaghat CollegeNadiaIndia
  3. 3.Department of ChemistryBidhannagar CollegeKolkataIndia

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