标题: Electro-enhanced heterogeneous activation of peroxymonosulfate via acceleration of Fe(III)/Fe(II) redox cycle on Fe-B catalyst
作者: Miao, F (Miao, Fei); Liu, ZH (Liu, Zehao); Kang, X (Kang, Xin); Cheng, C (Cheng, Cheng); Mao, XY (Mao, Xiaoyu); Li, RM (Li, Ruimeng); Lin, H (Lin, Heng); Zhang, H (Zhang, Hui)
来源出版物: ELECTROCHIMICA ACTA 卷: 377 文献号: 138073 DOI: 10.1016/j.electacta.2021.138073 出版年: MAY 1 2021
摘要: Heterogeneous catalytic oxidation based on iron species for peroxymonosulfate (PMS) activation is considered as one of the most attractive strategies for wastewater treatment. However, the rate-limiting regeneration of Fe(II) from Fe(III) heavily hampers the efficient activation of PMS. In this study, the introduction of electric field to the Fe-supported bentonite (Fe-B) activated PMS process was proposed to enhance the Fe(III)/Fe(II) redox cycle. The Fe-B catalyst performed well in the removal of Acid Orange 7 (AO7) through the synergistic effect of electrolysis and the continuous redox cycle of Fe(III)/Fe(II) for PMS activation. The use of 0.5 g L-1 Fe-B catalyst and 10 mM PMS yielded nearly complete removal of the AO7 (50 mg L-1) in 60 min at 2 mA cm(-2) of current density. Based on the results of electron paramagnetic resonance (EPR) spectroscopy, chemical quenching tests, X-ray photoelectron spectroscopy (XPS) analysis, and electrochemical measurements, the decolorization of AO7 was dominantly attributed to surface bound radicals (SO4 '& minus;ads and'OHads) and also the direct electron transfer at DSA anode. Moreover, the electro/Fe-B/PMS system showed an effective pH range from 2.6 to 9.0 and the abatement of AO7 was slightly affected in the presence of natural background anions. This work provides a feasible strategy of PMS activation by cost-effective Fe-B catalyst coupling with electric field and gives an insight into the accelerated oxidation of recalcitrant pollutants. (C) 2021 Elsevier Ltd. All rights reserved.
作者关键词: Fe-supported bentonite; Electric field; Fe(III)Fe(II) cycle; Heterogeneous activation; Peroxymonosulfate
地址: [Miao, Fei; Liu, Zehao; Kang, Xin; Cheng, Cheng; Mao, Xiaoyu; Li, Ruimeng; Lin, Heng; Zhang, Hui] Wuhan Univ, Hubei Environm Remediat Mat Engn Technol Res Ctr, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.
通讯作者地址: Lin, H; Zhang, H (通讯作者)，Wuhan Univ, Hubei Environm Remediat Mat Engn Technol Res Ctr, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.
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