Construction of flower-like BiOI/Bi2O2CO3 p-n heterojunction for photocatalytic degradation of Congo Red dye

文献类型： 外文期刊

第一作者： Zhang, Xiuping

作者： Zhang, Xiuping;Zhong, Yuanyuan;Xiao, Tian;Zhu, Xiaodong;Yu, Qiang;Jiao, Yu;Qi, Zhiyong

作者机构：

关键词： BiOI; p -n heterojunction; Photocatalytic performance

期刊名称：JOURNAL OF MOLECULAR STRUCTURE （ 影响因子：4.7； 五年影响因子：4.0 ）

ISSN： 0022-2860

年卷期： 2025 年 1336 卷

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收录情况： SCI

摘要： In this study, Bi2O2CO3 photocatalysts were first synthesized under different hydrothermal temperatures (180 degrees C, 190 degrees C, and 200 degrees C). Congo Red (CR) dye was used as an anionic pollutant model for photocatalytic degradation experiments. The results showed that the photocatalytic performance was optimal at a hydrothermal temperature of 190 degrees C. Based on this temperature, the modification of Bi2O2CO3 photocatalytic material was studied to solve the problems of easy recombination of photogenerated charge and insufficient quantum utilization. BiOI was coupled with Bi2O2CO3, which has matched band structures, to construct a BiOI/Bi2O2CO3 (BiOI/BOC) p-n heterojunction composite photocatalysts. Photocatalytic degradation experiments indicated that the BiOI/BOC composite with a molar ratio of 0.5 exhibited the highest photocatalytic activity. After 60 min of light irradiation, the degradation degree reached 78.7 %, and the first-order reaction rate constant was 0.0207 min-1, which is 2.5 times that of pure BOC (0.0083 min-1) and 3.1 times that of BiOI (0.0067 min-1). The enhanced photocatalytic activity of the BiOI/Bi2O2CO3 composites are attributed to the formation of p-n heterojunction at the contact interface between BiOI and Bi2O2CO3. In the p-n heterojunction, the significant difference in Fermi energy levels between the two results in a strong built-in electric field. Driven by the built-in electric field, e- in the CB of BiOI migrates to CB of Bi2O2CO3, and h+ in the VB of Bi2O2CO3 migrates to VB of BiOI, effectively promoting the separation of photogenerated carriers and thus enhancing photocatalytic activity. The photocatalytic degradation mechanism of the BiOI/BOC p-n heterojunction was proposed based on electrochemical tests and active species experiments.

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