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
Radiation-induced degradation of sulfamethoxazole in the presence of various inorganic anions
Shizong Wang,Jianlong Wang +1 more
TL;DR: In this article, the effect of common inorganic anions (chloride, bicarbonate, carbonate and phosphate) on the radiation-induced degradation of sulfamethoxazole (SMX) was investigated.
Journal ArticleDOI
Degradation kinetics and mechanism of 2,4-Di-tert-butylphenol with UV/persulfate
Qiongfang Wang,Yisheng Shao,Naiyun Gao,Wenhai Chu,Xiang Shen,Xian Lu,Juxiang Chen,Juxiang Chen,Yanping Zhu +8 more
TL;DR: In this paper, the degradation performance of 2,4-Di-tert-butylphenol (2,4D) by the UV/persulfate (UV/PS) process was evaluated for the first time.
Journal ArticleDOI
Heterogeneous activation of oxone with CoMg/SBA-15 for the degradation of dye Rhodamine B in aqueous solution
TL;DR: In this paper, a two-step incipient wetness impregnation of Mg and Co into mesoporous silica SBA-15 was used for the activation of oxone to generate sulphate radicals for degrading Rhodamine B (RhB) in aqueous solution.
Journal ArticleDOI
Oxidation of 2,4-dichlorophenol by non-radical mechanism using persulfate activated by Fe/S modified carbon nanotubes
TL;DR: A non-radical process of 2,4-DCP degradation is demonstrated for the first time in the results of the radical scavengers and chloride ionic, as well as persulfate decomposition.
Journal ArticleDOI
Bromate formation in bromide-containing water through the cobalt-mediated activation of peroxymonosulfate.
TL;DR: This is the first study to demonstrate the significant bromate formation in the Co/PMS system and the substantial contribution of Co(III) to the formation.
References
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Journal ArticleDOI
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Journal ArticleDOI
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