Journal ArticleDOI
Cobalt-mediated activation of peroxymonosulfate and sulfate radical attack on phenolic compounds. implications of chloride ions.
TLDR
The sulfate radical pathway of the room-temperature degradation of two phenolic compounds in water is reported, and it provides strong evidence on the interaction of chloride ions with sulfate radicals leading to halogenation of organics in water.Abstract:
The sulfate radical pathway of the room-temperature degradation of two phenolic compounds in water is reported in this study. The sulfate radicals were produced by the cobalt-mediated decomposition of peroxymonosulfate (Oxone) in an aqueous homogeneous system. The major intermediates formed from the transformation of 2,4-dichlorophenol were 2,4,6-trichlorophenol, 2,3,5,6-tetrachloro-1,4-benzenediol, 1,1,3,3-tetrachloroacetone, pentachloroacetone, and carbon tetrachloride. Those resulting from the transformation of phenol in the presence of chloride ion were 2-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol, 2,6-dichlorophenol, 1,1,3,3-tetrachloroacetone, and pentachloroacetone. In the absence of chloride ion, phenol transformed into 2,5-cyclohexadiene-1,4-dione (quinone), 1,2-benzenediol (catechol), and 1,4-benzenediol (hydroquinone). Several parameters were varied, and their impact on the transformation of the organic compounds is also discussed. The parameters varied were the initial concentration of the organic substrate, the dose of Oxone used, the cobalt counteranion, and in particular the impact of chloride ions and the quenching agent utilized for terminating the reaction. This is one of the very few studies dealing with intermediates formed via sulfate radical attack on phenolic compounds. It is also the first studythat explores the sulfate radical mechanism of oxidation, when sulfate radicals are generated via the Co/Oxone reagent. Furthermore, it provides strong evidence on the interaction of chloride ions with sulfate radicals leading to halogenation of organics in water.read more
Citations
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Journal ArticleDOI
Behavioral evidence of the dominant radicals and intermediates involved in bisphenol A degradation using an efficient Co2+/PMS oxidation process.
Yi-Fong Huang,Yao Hui Huang +1 more
TL;DR: This study investigated the degradation and mineralization of Bisphenol A at pH 7, taken as a model compound in the presence of the trace metal-ions, Co(2+), and peroxymonosulfate, and took advantage of the high oxidation-reduction potential of hydroxyl and sulfite radicals transformed from PMS as the oxidants to oxidize BPA to less complex compounds.
Journal ArticleDOI
Cobalt/Peracetic Acid: Advanced Oxidation of Aromatic Organic Compounds by Acetylperoxyl Radicals.
TL;DR: Assessing the structure-activity relationship between compounds' molecular descriptors and pseudo-first-order degradation rate constants by Co/PAA showed the number of ring atoms, EHOMO, softness, and ionization potential most influential, strongly suggesting the electron transfer mechanism from aromatic compounds to the acetylperoxyl radical.
Journal ArticleDOI
Application of a peroxymonosulfate/cobalt (PMS/Co(II)) system to treat diesel-contaminated soil
TL;DR: The degradation of diesel increased as much as 88% when PMS/Co(II) systems are applicable for remediation of soil contaminated with diesel fuel as an aspect of in situ chemical oxidation.
Journal ArticleDOI
A novel quasi-cubic CuFe2O4–Fe2O3 catalyst prepared at low temperature for enhanced oxidation of bisphenol A via peroxymonosulfate activation
TL;DR: In this paper, a facile eco-friendly co-precipitation synthesis at low temperature was employed to fabricate CuFe2O4-Fe 2O3 for the oxidation of bisphenol A (BPA) via peroxymonosulfate (PMS) activation.
Journal ArticleDOI
Nanosized Co3O4/SiO2 for heterogeneous oxidation of phenolic contaminants in waste water
TL;DR: In this article, the physicochemical properties of three Co/SiO2 catalysts were characterized by several techniques, such as XRD, SEM, TEM, FT-IR and FT-Raman, and the catalytic activity in heterogeneous activation of peroxymonosulphate to produce sulphate radicals for phenol degradation was investigated.
References
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Journal ArticleDOI
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