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
Thermally activated persulfate (TAP) oxidation of antiepileptic drug carbamazepine in water
TL;DR: In this paper, the authors investigated the influencing factors including persulfate dosage, initial carbamazepine (CBZ) concentrations, solution pH, coexisting inorganic anions and cations on the decomposition of CBZ using thermally activated persulfates (TAP) technology.
Journal ArticleDOI
Uncertainty and misinterpretation over identification, quantification and transformation of reactive species generated in catalytic oxidation processes: A review.
TL;DR: This review aims to clarify the corresponding issues through surveying literature, including the uncertainty about the identity of radicals in the bulk solution or adsorbed on the catalyst surface in quenching tests, selection of proper scavengers, and the incorrect identification of EPR signals.
Journal ArticleDOI
Surface-loaded metal nanoparticles for peroxymonosulfate activation: Efficiency and mechanism reconnaissance
Yong Yoon Ahn,Hyokwan Bae,Hyoung Il Kim,Sang Hoon Kim,Jae-Hong Kim,Seung Geol Lee,Jaesang Lee +6 more
TL;DR: In this article, the authors examined the efficiency and mechanism of peroxymonosulfate (PMS) activation by twenty metal and metalloid nanoparticles loaded on alumina.
Journal ArticleDOI
Heterogeneous activation of peroxymonosulfate by LaCo1-xCuxO3 perovskites for degradation of organic pollutants.
TL;DR: LaCo1-xMxO3 perovskites as heterogeneous catalysts of PMS were synthesized for the degradation of phenol and XPS analysis confirmed that substitution of copper could promote the cycle of CoII/CoIII, thus enhance the catalytic efficiency for PMS activation.
Journal ArticleDOI
Co-SBA-15 for heterogeneous oxidation of phenol with sulfate radical for wastewater treatment
TL;DR: In this paper, the physicochemical properties of the catalysts were characterized by several techniques, such as XRD, SEM (EDS), TEM, and FT-IR, and the effects of catalyst loading, peroxymonosulfate concentration and reaction temperature on phenol degradation were investigated.
References
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