过硫酸盐
降级(电信)
激进的
光化学
电子顺磁共振
化学工程
化学
X射线光电子能谱
氧化剂
辐照
双酚A
无机化学
催化作用
有机化学
计算机科学
电信
环氧树脂
核物理学
工程类
物理
核磁共振
作者
Lihan Pan,Wen Shi,Tapas Sen,Lingzhi Wang,Jinlong Zhang
标识
DOI:10.1016/j.apcatb.2020.119414
摘要
The role of high-valent Fe has rarely been explored in persulfate-based heterogeneous reaction. Herein, the existence of Fe(IV) is verified in a visible light-assisted FeTiO3/persulfate system using methyl phenyl sulfoxide as the probe. The FeTiO3/persulfate/light system is capable of selectively degrading aromatic compounds with lower ionization potentials including tetracycline and bisphenol A by photo-generated high-valent Fe(IV). The contributions from SO4·-, ·OH and 1O2 are excluded. The comparable efficiency in the dark requires higher dosages and suffers from a rapid deactivation. Based on XPS, Raman and EPR analyses, the poor dark activity is caused by the formation of a complex between in situ formed Fe(III) and SO42-on the FeTiO3 surface; this complex is, however, the key intermediate for Fe(IV) production under the light irradiation. This study reveals the long-ignored role of SO42- as an abundant species in iron-based persulfate systems. We also call for re-evaluating the real oxidation mechanism in other persulfate-based reactions considering the different oxidation mechanisms of radicals and high-valent iron.
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