赤铁矿
化学
亚硫酸盐
X射线光电子能谱
水溶液
猝灭(荧光)
无机化学
电子顺磁共振
质谱法
亚硫酸钠
光化学
化学工程
钠
有机化学
荧光
色谱法
矿物学
核磁共振
工程类
物理
量子力学
作者
Gen Li,Yaxuan Jin,Yupeng Yan,Mingxia Wang,Wenfeng Tan,Fan Liu,Xionghan Feng,Hui Yin
标识
DOI:10.1016/j.cej.2020.126124
摘要
The formation of high-valent iron-oxo species (i.e., Fe(IV) = O, Fe(V) = O) is of vital importance in iron-mediated advanced oxidation processes (AOPs) for the rapid removal of organic contaminants, and it is mainly derived from the reduction of ferrate(VI) or the oxidation of homogeneous Fe(II). In this study, we have shown Fe(III) in the hematite surfaces under light illumination in the presence of sulfite can generate high-valent iron-oxo species that efficiently degrade refractory organics under alkaline conditions. Interactions between hematite and sulfite under xenon lamp irradiation in aqueous solution were investigated by combination of quenching experiments, electron spin resonance (ESR), high-performance liquid chromatography coupled with mass spectrometer (HPLC-MS), and X-ray photoelectron spectroscopy (XPS) techniques, and a possible mechanism was proposed. Importantly, this work demonstrates a novel and fundamental breakthrough toward the design synthesis and understanding of the high-valent iron-oxo species, and also might provide potential applications in the treatment of alkaline wastewaters.
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