化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (11) : 130-135. DOI: 10.19817/j.cnki.issn1006-3536.2022.11.026

新材料与新技术

硅藻土/Bi/g-C₃N₄复合材料的制备及其可见光催化性能研究

肖力光, 杨猜霞, 刘哲, 寇红阳

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Preparation and photocatalytic performances of diatomite/Bi/g-C₃N₄ composite material

Xiao Liguang, Yang Caixia, Liu Zhe, Kou Hongyang

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Received		Published
2021-07-05		2022-11-20
Issue Date	Revised Date
2022-11-30	2021-07-05

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摘要

以三聚氰胺和五水合硝酸铋[Bi(NO₃)₃·5H₂O]为前驱体,硅藻土为基质,制备了硅藻土/Bi/石墨相氮化碳(g-C₃N₄)复合材料。采用多种表征方法对复合材料的形貌、结构和化学组成等进行分析,在可见光(波长大于400nm)照射下,通过还原液相体系中的甲基橙(MO)考察了复合材料的光催化性能。光催化实验结果表明,质量分数为6%的硅藻土/Bi/g-C₃N₄复合材料在30min内对MO降解效率可达100%。金属Bi的表面等离子体共振效应引起的内置电场加快了电子和空穴的分离速度,硅藻土作为基质可以有效避免复合材料的团聚,其超大的比表面积有利于催化过程中复合材料活性位点的暴露,同时其复杂的孔隙结构可以促进复合材料对污染物的吸附,提高MO的降解效率。

Abstract

A series of diatomite/Bi/g-C₃N₄ composite photocatalytic materials were prepared using melamine and Bi(NO₃)₃·5H₂O as precursor and diatomite as matrix.The morphology,structure and chemical composition of the composites were analyzed by various characterization methods.The photocatalytic performance of the composites was investigated by reducing methyl orange (MO) in the liquid phase under visible light irradiation(λ>400nm).The results of photocatalytic experiments showed that the MO degradation efficiency of 6% diatomite/Bi/g-C₃N₄ could reach 100% within 30min.The built-in electric field caused by the SPR effect of the metal Bi accelerated the separation speed of electrons and holes,diatomite as the substrate could effectively avoid the agglomeration of the composite material,and its large specific surface area was conducive to the exposure of the active sites of the composite material in the catalytic process.

关键词

硅藻土 / 石墨相氮化碳 / 表面等离子体共振效应 / 光催化

Key words

diatomite / g-C₃N₄ / surface plasmon resonance(SPR) effect / photocatalysis

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硅藻土/Bi/g-C₃N₄复合材料的制备及其可见光催化性能研究[J]. 化工新型材料, 2022, 50(11): 130-135 DOI:10.19817/j.cnki.issn1006-3536.2022.11.026

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