g-C3N4/BiOCl composite photocatalyst used as 2D/2D heterojunction for photocatalytic degradation of dyes

被引：0

作者：

Wu J. ^{[1
,2
]}

Shi L. ^{[1
,2
]}

Zheng X. ^{[1
,2
]}

Zhang M. ^{[1
,2
]}

Chen L. ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan

[2] Hunan Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Xiangtan

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 01期

关键词：

bismuth chloride oxide; graphite phase carbon nitride; heterojunction; photocatalytic; rhodamine B;

D O I：

10.13801/j.cnki.fhclxb.20220225.006

中图分类号：

学科分类号：

摘要：

In order to expand the sunlight absorption range of BiOCl and obtain more efficient photocatalyst, Graphite phase carbon nitride (g-C3N4)/BiOCl (2D/2D) composite photocatalyst was prepared by hydrothermal method and characterized in detail. The results of structural and morphology characterization show that BiOCl nanosheets are deposited on the layered g-C3N4 surface to form 2D/2D face-face composite structure. The analysis of photoelectric chemical properties shows that the formation of heterostructure can effectively expand the frequency range of light absorption and promote the separation and migration of photocarriers, which is conducive to the improvement of photocatalytic performance. The results of photocatalytic degradation of RhB by xenon lamp (500 W) show that the photocatalytic degradation activity of g-C3N4/BiOCl heterojunction is much higher than that of g-C3N4 and BiOCl alone. Among them, 9wt%g-C3N4/BiOCl shows the most superior photocatalytic activity, and the degradation rate of RhB is 94% within 180 min, and the apparent rate constant Kapp value of 9wt%g-C3N4/BiOCl is 5.7 and 3.6 times that of g-C3N4 and BiOCl. At the same time, the photocatalytic mechanism of g-C3N4/BiOCl heterojunction was studied, and the photocatalytic degradation mechanism of RhB under dye sensitization was proposed by combining the electronic structure of the composite catalyst and free radical capture experiment. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

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