Defect-engineered FeSe2_x@C with porous architecture for enhanced peroxymonosulfate-based advanced oxidation processes

Sun, Cheng ¹Li, Shiyin ²Zhong, Qiang ²Xu, Chenmin ²Liu, Yazi ²Ji, Qiuyi ²Xu, Zhe ²Sun, Dunyu ²Zhou, Shuohua ²Yang, Bing ²Dai, Yinhao ²Qi, Chengdu ²Yang, Shaogui ²He, Huan²

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作者信息

1. Nanjing Univ
2. Nanjing Normal Univ
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Abstract

A novel heterogeneous and porous FeSe2_x @C-5 with abundant Se vacancies (V-se) was facilely synthesized via one-step carbonization-selenization approach from Fe-MOFs (metal-organic frameworks) and firstly applied in activating peroxymonosulfate (PMS) for iohexol (IOH) removal, exhibiting extraordinary catalytic performance with superior stability and adaptability. The roles and functions of V-se in the reaction system are deeply elucidated. Strikingly, systematic characterization and theoretical calculations revealed that V-se can modulate the surface electronic structure and accelerate Fe3+/Fe2+ cycle, leading to the strengthened binding energy and accelerated charge deliver for PMS activation. Accordingly, Iohexol (15 mg/L) can be eliminated within 30 min in FeSe2_x @C-5/PMS system, with apparent reaction rate constant (k(app)) 23.7 times higher than that in FeSe2/ PMS system. This study not only contributes to a tutorial guideline for designing high-performance catalysts by virtue of structural control and V-se engineering, but also extends its potential application in low-strength wastewater treatment.

Key words

Iohexol/Defect-engineered/Peroxymonosulfate/Advanced oxidation processes/Porous FeSe2_x@C/RAY CONTRAST-MEDIA/DEGRADATION/IRON/CONTAMINANTS/PRODUCTS/SELENIDE

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量29

参考文献量67

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