过氧二硫酸盐
化学
反应性(心理学)
砜
试剂
亚砜
羟基自由基
联苯
人体净化
硫酸盐
光化学
无机化学
激进的
有机化学
催化作用
核物理学
替代医学
病理
物理
医学
作者
Zhen Wang,Jin Jiang,Shengyong Pang,Yang Zhou,Chaoting Guan,Yuan Gao,Juan Li,Yi Yang,Wei Qiu,Chengchun Jiang
标识
DOI:10.1021/acs.est.8b02266
摘要
It is well documented that the traditional Fenton reagent (i.e., the combination of Fe(II) and H2O2) produces hydroxyl radical (•OH) under acidic conditions, while at near-neutral pH the reactive intermediate converts to ferryl ion (Fe(IV)) that can oxidize sulfoxides to produce corresponding sulfones, markedly differing from their •OH-induced products. However, it remains unclear whether Fe(IV) is generated in the Fe(II) activated peroxydisulfate (PDS) process, where sulfate radical (SO4•-) is long recognized as the dominant intermediate in literature. Here we demonstrated that SO4•- oxidized methyl phenyl sulfoxide (PMSO, a model sulfoxide) to produce biphenyl compounds rather than methyl phenyl sulfone (PMSO2). Interestingly, the formation of PMSO2 was observed when PMSO was treated by the Fe(II)/PDS system over a wide pH range, and the yields of PMSO2 were quantified to be ∼100% at acidic pH 3-5. The identification of Fe(IV) in the Fe(II)/PDS system could also reasonably explain the literature results on alcohol scavenging effect and ESR spectra analysis. Further, a Fe(IV)-based kinetic model was shown to accurately simulate the experimental data. This work urges re-evaluation of the Fe(II)/PDS system for environmental decontamination, given that Fe(IV) would have different reactivity toward environmental contaminants compared with SO4•- and/or •OH.
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