Synthesis Of Coal Fly Ash Supported Mno2 For The Enhanced Degradation Of Acid Red 73 In The Presence Of Peroxymonosulfate
ENVIRONMENTAL TECHNOLOGY(2021)
摘要
In this study, coal fly ash supported MnO2 (CFA@MnO2) was synthesized as heterocatalyst for the activation of peroxymonosulfate to degrade Acid Red 73 (AR73). The synthesized catalyst was characterized by X-Ray Fluorescence Spectrometer (XRF), X-ray powder diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET). The composite of CFA@MnO2 possesses a large surface area of 74.59 m(2)/g. In the catalytic experiment, CFA@MnO2 exhibits excellent catalytic performance with 99.13% AR73 removed within 40 min with a high kinetic rate constant of 0.124 min(-1), 5.49 times higher than that of pure MnO2. The operating parameters of CFA@MnO2-based fenton catalytic system were discussed, including MnO2 loading, solution pH, PMS dosage and temperature. The catalyst maintained a relatively high removal rate (>85%) over 5 cycles and degradation intermediates are detected on the catalyst surface after cycled via XPS analysis. The degradation mechanism was investigated by quenching experiments and Electron Paramagnetic Resonance technology. The surface-bound (OH)-O-center dot and SO4 center dot- are considered as the main active radicals in the degradation process. The composite of CFA@MnO2 provides a low-cost and efficient alternative for the catalytic oxidation of organic pollutants.[GRAPHICS].
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关键词
Fly ash, manganese oxide (MnO2), heterogeneous catalysis, degradation, Acid Red 73
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