Based on a dual Z-scheme heterojunction and magnetically separable CoFe2O4/g-C3N4/Bi4Ti3O12 flower-like composite for efficient visible-light photocatalytic degradation of organic pollutants

被引:45
作者
Zhu, Pengfei [1 ,2 ,3 ]
Luo, Dan [1 ]
Duan, Ming [1 ,3 ]
Feng, Leiyan [1 ]
Zhang, Shasha [1 ]
Liu, Mei [1 ]
机构
[1] Southwest Petr Univ, Sch Chem & Chem Engn, Chengdu 610500, Peoples R China
[2] Southwest Petr Univ, Res Inst Ind Hazardous Waste Disposal & Resource U, Chengdu 610500, Sichuan, Peoples R China
[3] Southwest Petr Univ, Oil & Gas Field Appl Chem Key Lab Sichuan Prov, Chengdu 610500, Peoples R China
基金
中国国家自然科学基金;
关键词
Heterojunction; Malachite green; Photocatalysis; Bi4Ti3O12; METHYLENE-BLUE; CARBON NITRIDE; CONSTRUCTION; NANOCOMPOSITE; DECOMPOSITION; PERFORMANCE; G-C3N4;
D O I
10.1016/j.jallcom.2022.164907
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A novel magnetic CoFe2O4/g-C3N4/Bi4Ti3O12 composite photocatalyst has been successfully prepared via an ultrasonic-assisted heat treatment method for the degradation of malachite green (MG) dye in wastewater. The crystal structure, element composition, morphology, and optical properties of the as-prepared samples are investigated by a series of characterization techniques. The maximum degradation rate for MG reaches 98.05% over 40%-CoFe2O4/g-C3N4/Bi4Ti3O12 composite after optimizing the dosage and concentration, which is better photocatalytic activity than pure Bi4Ti3O12 and g-C3N4/Bi4Ti3O12. In addition, CoFe2O4/g-C3N4/Bi4Ti3O12 can be conveniently separated from the reaction system by the external magnetic field and reused multiple times. The characterization shows that the enhanced activity of CoFe2O4/g-C3N4/Bi4Ti3O12 is mainly due to the formation of heterojunction, promoting the separation efficiency of photogenerated electron-hole (e (-)/h(+)) pair. The capture experiments and EPR spectra show that the main active substances are h(+) and center dot O-2(-) for decomposing MG in the reaction system. Then, a dual Z-scheme heterojunction electron transfer mechanism is proposed. This study provides an idea for cycle stable magnetic photocatalysts for the treatment of MG solution. (c) 2022 Elsevier B.V. All rights reserved.
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页数:17
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