The Aqueous Degradation of Butylated Hydroxyanisole by UV/S2O82-: Study of Reaction Mechanisms via Dimerization and Mineralization
- 9 December 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 41 (2), 613-619
- https://doi.org/10.1021/es061395a
Abstract
Three distinctive phases of BHA reactivity toward UV/S2O82- at acidic, neutral, and basic pH range were examined, where 80−100% mineralization has been observed within an hour of irradiation under 254 nm. A reduction in solution pH during the reaction was observed mainly due to the complete conversion of S2O82- to sulfate ion together with proton generation. Seven measurable intermediates were found via an oxidation and dimerization process at all tested pH levels. The BHA decay mechanisms are quite different in acidic condition and at other pH levels. There are three unique intermediates that are only detectable at pH 3 via two additional pathways. This is due to the generation of weaker oxidants or radicals which results in a slower degradation of the BHA, and therefore, the accumulation of these intermediates to detectable levels. The rate of BHA decay generally increases from low to high pH levels; however, the corresponding mineralization at higher pH is retarded due to the futile process of recombining radicals and involvement of intermediates. Therefore, neutral pH was suggested to be the optimum condition in terms of mineralization and moderate efficiency in removing BHA.Keywords
This publication has 18 references indexed in Scilit:
- Synergy in the Autoxidation of S(IV) Inhibited by Phenolic CompoundsThe Journal of Physical Chemistry A, 2003
- Synergistic cytotoxicity of Δ9-tetrahydrocannabinol and butylated hydroxyanisoleToxicology Letters, 2002
- K2S2O8-Initiated Sulfonation of Methane to Methanesulfonic AcidIndustrial & Engineering Chemistry Research, 2001
- Oxidation Efficiencies of Potassium Persulfate and Hydrogen Peroxide in Pressurized Hot Water with and without PreheatingIndustrial & Engineering Chemistry Research, 2000
- Measurement of dissolved total nitrogen in wastewater by UV photooxidation with peroxodisulphateAnalytica Chimica Acta, 1999
- Kinetics and Mechanism of Microemulsion Polymerization of Hexyl MethacrylateMacromolecules, 1997
- A variety of environmentally persistent chemicals, including some phthalate plasticizers, are weakly estrogenic.Environmental Health Perspectives, 1995
- Butylated hydroxyanisole in perspectiveChemico-Biological Interactions, 1991
- Kinetics of the reactions of the SO ? 4 radical with SO ? 4 , S2O 2? 8 , H2O and Fe2+Journal of the Chemical Society, Faraday Transactions, 1990
- Kinetics and Mechanism of Oxidations by Peroxydisulfate.Chemical Reviews, 1962