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
Effects of chloride on PMS-based pollutant degradation: A substantial discrepancy between dyes and their common decomposition intermediate (phthalic acid)
TL;DR: The impact of chlorine on the degradation rate of phthalic acid by the Co2+/peroxymonosulfate (PMS) process was examined and an overall negative impact was observed within the concentration of Cl- up to 100 mM, differing from the dual effect of chloride on dye degradation process as previously observed.
Journal ArticleDOI
Efficient removal of trichloroethylene in surfactant amended solution by nano Fe0-Nickel bimetallic composite activated sodium persulfate process
Ali Shan,Ali Shan,Usman Farooq,Shuguang Lyu,Waqas Qamar Zaman,Zain Abbas,Meesam Ali,Meesam Ali,Ayesha Idrees,Ping Tang,Ming Li,Yong Sun,Qian Sui +12 more
TL;DR: In this article, nano zero valent iron-nickel composite (nZVI-Ni) was prepared successfully by ion exchange process and investigated as a proficient sodium persulfate (SPS) activator for the removal of TCE in Fenton-like oxidation system.
Journal ArticleDOI
Enhancing photocatalytic degradation of the cyanotoxin microcystin-LR with the addition of sulfate-radical generating oxidants.
Maria G. Antoniou,Iosef Boraei,Maria Solakidou,Yiannis Deligiannakis,Mahalakshmi Abhishek,Linda A. Lawton,Christine Edwards +6 more
TL;DR: Structural identification of transformation products (TPs) formed during all treatments, indicated that early stage degradation of microcystin-LR occurred mainly on the aromatic ring and conjugated carbon double bonds of the ADDA amino acid.
Journal ArticleDOI
Peroxymonosulfate Rapidly Inactivates the Disease-Associated Prion Protein
TL;DR: It is found that peroxymonosulfate rapidly degrades PrP(TSE) from two species, and this study indicates that per oxygenmonos sulfurate may hold promise for decontamination of prion-contaminated surfaces.
Journal ArticleDOI
Enhanced atrazine degradation in the Fe(III)/peroxymonosulfate system via accelerating Fe(II) regeneration by benzoquinone
TL;DR: In this paper, p-benzoquinone (BQ) was used to accelerate Fe(III)/Fe(II) cycle and promote atrazine (ATZ) degradation through reconstructing active Fe(II)/PMS system.
References
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