Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 178, Issue 1-3, Pages 258-263Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.01.071
Keywords
Surfactant degradation; Fenton reaction; Catechol
Categories
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brasilia
- FAPEAL
- INCT
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The addition of 0.5 mM catechol is shown to accelerate the degradation and mineralization of the anionic surfactant DOWFaX (TM) 2A1 (sodium dodecyldiphenyloxide disulfonate) under conventional Fenton reaction conditions (Fe(II) plus H2O2 at pH 3). The catalytic effect causes a 3-fold increase in the initial rate (up to ca. 20 min) of conversion of the surfactant to oxidation products (apparent first-order rate constants of 0.021 and 0.061 min(-1) in the absence and presence of catechol, respectively). Although this catalytic rate increase persists for a certain amount of time after complete disappearance of catechol itself (ca. 8 min), the reaction rate begins to decline slowly after the initial 20 min towards that observed in the absence of added catechol. Total organic carbon (TOC) measurements of net mineralization and cyclic voltammetric and high performance liquid chromatographic (HPLC) measurements of the initial rate of reaction of catechol and the surfactant provide insight into the role of catechol in promoting the degradation of the surfactant and of degradation products as the eventual inhibitors of the Fenton reaction. (C) 2010 Elsevier B.V. All rights reserved.
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