零价铁
电子顺磁共振
催化作用
激进的
双酚A
化学工程
反应速率常数
中心组合设计
价(化学)
猝灭(荧光)
光化学
化学
无机化学
动力学
响应面法
物理化学
有机化学
吸附
荧光
核磁共振
色谱法
物理
量子力学
环氧树脂
工程类
作者
Ye Tan,Shuilin Zheng,Yonghao Di,Chunquan Li,Runze Bian,Zhiming Sun
标识
DOI:10.1016/j.jmst.2021.03.071
摘要
Diatomite supported nano zero valent iron (nZVI) catalyst (NDA) with complex network structure was prepared via a mild reduction precipitation method in this work. The pore structure and pore distribution of NDA can be regulated and controlled through adjusting the loading amount of nZVI. In general, the nano three-dimensional network formed by nZVI and diatomite channels greatly increase the specific surface area and pore volume of NDA, and further formed more active sites, which made NDA have better performance in activating PMS to degrade BPA than pure nZVI. The pseudo-first-order reaction rate constant of 50-NDA (50%-nZVI/diatomite) is almost 3 times higher than that of pure nZVI. Besides, the electron paramagnetic resonance (EPR) and radical quenching experiments showed that the activation process was dominated by the sulfate radical (SO4·−) and hydroxyl radical (·OH) produced by Fe0 oxidation. The generated electrons promote the self-decomposition of PMS to produce singlet oxygen (1O2), and then the valence state of iron changes to produce free radicals. In addition, the possible degradation pathway of BPA was inferred from the intermediate products identified by liquid chromatograph-mass spectrometer (LC-MS). This study provides a novel strategy for the design and preparation of three-dimensional composite catalysts derived from natural mineral.
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