Efficient degradation of tetracycline in real water systems by metal-free g-C3N4 microsphere through visible-light catalysis and PMS activation synergy

被引：79
作者：
Shi, Heng [1 ,2 ]
He, Yi [1 ,2 ,3 ]
Li, Yubin [4 ]
He, Teng [1 ,2 ]
Luo, Pingya [1 ,2 ]
机构：
[1] Southwest Petr Univ, Coll Chem & Chem Engn, Chengdu 610500, Sichuan, Peoples R China
[2] Southwest Petr Univ, Oil & Gas Field Appl Chem Key Lab Sichuan Prov, Chengdu 610500, Sichuan, Peoples R China
[3] Southwest Petr Univ, State Key Lab Oil Gas Reservoir Geol & Exploitat, Chengdu, Peoples R China
[4] Southwest Petr Univ, Sch New Energy & Mat, Chengdu 610500, Sichuan, Peoples R China
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2022年 / 280卷
基金：
中国国家自然科学基金;
关键词：
g-C3N4; Curved structure; Peroxymonosulfate; Photocatalysis; Microsphere; PEROXYMONOSULFATE ACTIVATION; PHOTOCATALYTIC DEGRADATION; OXIDATION; NITRIDES;
D O I：
10.1016/j.seppur.2021.119864
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
In this study, a porous C3N4 microsphere (MCN) with curved structure was fabricated through the preassemblycalcination method, and the visible-light catalysis and PMS activation synergy were studied. Different from the conventional bulk g-C3N4 (CN) with flat geometry, the curvature of the C3N4 microsphere has shown significantly enhanced PMS assisted visible-light catalysis efficiency. Besides, the synergy between PMS activation and photocatalysis on MCN is highly favorable for the application in real water systems. Quenching tests and electron paramagnetic resonance (EPR) analysis revealed that the visible-light catalysis and PMS activation synergy on MCN mainly enhanced the nonradical pathway. DFT calculation indicates that the enhanced performance of MCN than CN is due to the curvature induced spatially uneven distribution of electrons, which facilitates the dissociation of exciton and enhances the electron donation ability of N atoms.
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页数：12
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