Journal ArticleDOI
Activation of Peroxymonosulfate by Benzoquinone: A Novel Nonradical Oxidation Process
TLDR
Findings have important implications for the development of novel nonradical oxidation processes based on PMS, because 1O2 as a moderately reactive electrophile may suffer less interference from background organic matters compared with nonselective •OH and SO4•-.Abstract:
The reactions between peroxymonosulfate (PMS) and quinones were investigated for the first time in this work, where benzoquinone (BQ) was selected as a model quinone. It was demonstrated that BQ could efficiently activate PMS for the degradation of sulfamethoxazole (SMX; a frequently detected antibiotic in the environments), and the degradation rate increased with solution pH from 7 to 10. Interestingly, quenching studies suggested that neither hydroxyl radical (•OH) nor sulfate radical (SO4•–) was produced therein. Instead, the generation of singlet oxygen (1O2) was proved by using two chemical probes (i.e., 2,2,6,6-tetramethyl-4-piperidinol and 9,10-diphenylanthracene) with the appearance of 1O2 indicative products detected by electron paramagnetic resonance spectrometry and liquid chromatography mass spectrometry, respectively. A catalytic mechanism was proposed involving the formation of a dioxirane intermediate between PMS and BQ and the subsequent decomposition of this intermediate into 1O2. Accordi...read more
Citations
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Journal ArticleDOI
Peroxymonosulfate activation by iron(III)-tetraamidomacrocyclic ligand for degradation of organic pollutants via high-valent iron-oxo complex.
TL;DR: New light is shed on effective PMS activation by Fe-ligand complexes to efficiently degrade organic contaminants via nonradical pathway through catalytic oxidation of p-chlorophenol using iron(III)-tetraamidomacrocyclic ligand as a model one.
Journal ArticleDOI
Oxidation of steroid estrogens by peroxymonosulfate (PMS) and effect of bromide and chloride ions: Kinetics, products, and modeling.
TL;DR: PMS readily oxidized the phenolic group of steroid estrogens, leading to the generation of hydroxylated and ring-opening products and Eco-toxicity of transformation products of 17α-ethinylestradiol by PMS treatment in the absence and presence of bromide and chloride was estimated by quantitative structure-activity relationship analysis using ECOSAR.
Journal ArticleDOI
Nitrogen-doped graphene as peroxymonosulfate activator and electron transfer mediator for the enhanced degradation of sulfamethoxazole
TL;DR: In this article, Nitrogen-doped graphene (NRGO) was used to activate peroxymonosulfate (PMS) for the degradation of sulfamethoxazole (SMX).
Journal ArticleDOI
Degradation of antibiotic pollutants by persulfate activated with various carbon materials
TL;DR: Antibiotic residues are ubiquitous in wastewater, surface water, and groundwater worldwide with concentrations ranging from 0.1 to 5.5 mM as discussed by the authors, with concentrations varying from 1.5 to 10 mM.
Journal ArticleDOI
Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism
TL;DR: Hydroxylamine (HA) is employed to improve the oxidation efficiency of Fe(II)/HSO5- (Fe(II/PMS) process, by selecting sulfamethoxazole (SMX) as the target compound, and the degradation efficiency and mechanism of SMX by the HA/Fe( II)/PMS process were elucidated for the first time.
References
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Journal ArticleDOI
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Journal Article
Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
Journal ArticleDOI
Rate Constants for Reactions of Inorganic Radicals in Aqueous Solution
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Journal ArticleDOI
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TL;DR: Nine transition metals were tested for the activation of three oxidants and the generation of inorganic radical species such as sulfate, peroxymonosulfate, and hydroxyl radicals to postulate the rate-determining step of the redox reactions taking place when a metal is coupled with an oxidant in aqueous solution.
Journal ArticleDOI
Degradation of organic contaminants in water with sulfate radicals generated by the conjunction of peroxymonosulfate with cobalt.
TL;DR: The advantage of Co/PMS compared to the traditional Fenton Reagent is attributed primarily to the oxidizing strength of the radicals formed, since sulfate radicals are stronger oxidants than hydroxyl and the thermodynamics of the transition-metal-oxidant coupling.
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