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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Book ChapterDOI
Advanced Oxidation Processes for Water and Wastewater Treatment: An Introduction
TL;DR: In this paper, the fundamental mechanisms of different AOPs such as ozonation, hydrogen peroxide, UV, persulfate, and Fenton oxidation are summarized and compared.
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Methylene blue removal by submerged plasma irradiation system in the presence of persulfate
Guntae Son,Hongshin Lee +1 more
TL;DR: The influence of added persulfate such as peroxydisulfate or peroxymonosulfate on the removal efficiency of methylene blue in the SPI system was investigated and the SPI-PMS system was the most effective for MB removal.
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Furfural degradation through heat-activated persulfate: Impacts of simulated brine and elevated pressures
TL;DR: In this paper, persulfate activated transformation of organic additives in a simulated hydraulic fracturing brine by investigating the transformation of furfural was examined, and reaction byproducts were presented.
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Application of a novel definitive screening design to decolorization of an azo dye on boron-doped diamond electrodes
TL;DR: In this article, the effect of nine quantitative parameters (i.e., initial dye concentration, current density, pH and electrolysis time) were investigated, and four out of the nine factors were statistically significant for process characterization using a subsequent central composite design.
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Three-dimensional zigzag Prussian blue analogue and its derivates for bisphenol A scavenging: Inhomogeneous spatial distribution of FeIII in anisotropic etching of PBA
TL;DR: In this article, a Prussian blue analogue (PBA) bearing the ensemble of walls with uniform thickness (∼60 nm) in three-dimensional space was acquired by the preferential etching of two opposing corners of its parent NiCo-PBA cubes that was pre-doped by metal ligand ions (i.e., [Fe(CN)6]3−).
References
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