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
Z-scheme heterojunction WO3/BiOBr supported-single Fe atom for ciprofloxacin degradation via visible-light photocatalysis
TL;DR: In this paper , the performance of single-atom Fe catalysts with WO 3 /BiOBr was investigated for photocatalytic degradation of Ciprofloxacin (CIP) and the effects of initial pH, initial CIP concentration, catalyst dosage, light intensity, inorganic anions and humic acid on CIP removal rate were examined.
Journal ArticleDOI
Sustainable heterolytic cleavage of peroxymonosulfate by promoting Fe(III)/Fe(II) cycle: The role of in-situ sulfur
Michelle Lee,Gloria M. Mulenga +1 more
TL;DR: In this paper , the physicochemical properties of the catalysts were explored carefully, and electron paramagnetic resonance analysis and quenching experiments were conducted to investigate the active species in the reaction.
Journal ArticleDOI
Ferrocene doped ZIF-8 derived Fe-N-C single atom catalyst to active peroxymonosulfate for removal of bisphenol A
Zhi-Hong Huang,Haojie Yu,Li Rong Wang,Ming-Song Wang,Xiaowei Liu,Di Shen,Sudan Shen,Shu-Ting Ren,Te-Hsi Lin,Shuang-Ying Lei +9 more
TL;DR: In this paper , a serial of single atom catalyst (SAC) based on single Fe atoms anchored on N-doped porous carbon matrix (Fe-N-C) were successfully prepared through simple pyrolysis method.
Journal ArticleDOI
Enhanced mechanism of carbamazepine degradation by electrochemical activation of persulfate in flow-through system
TL;DR: In this article , the effect of persulfate (PS) activation on the removal of carbamazepine (CBZ) was investigated in a flow-through system using boron and cobalt co-doped TiO 2 nanotubes (B, Co-TNT) as anode and carbon felt (CF) as cathode.
Journal ArticleDOI
Identification of step-by-step oxidation process and its driving mechanism in the peroxymonosulfate catalytically activated with redox metal oxides
Xinquan Zhou,Qindi Zhao,Yongjing Tian,Jia Wang,Ali Jawad,Songlin Wang,Zhulei Chen,Zhuqi Chen +7 more
TL;DR: In this paper, a step-by-step oxidation process based on the in-depth analysis of the catalytic mechanism of peroxymonosulfate (PMS) activated by the common MnO2-based catalyst-manganese octahedral molecular sieve (OMS-2) was proposed.
References
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Journal ArticleDOI
Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
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Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
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Radical generation by the interaction of transition metals with common oxidants.
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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