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Efficient photocatalytic and piezocatalytic performance in oxygen-vacant CdBiO2Br with localized internal electric field

文献类型： 外文期刊

作者： Xu, Ziyue 1 ; Wang, Jingjing 1 ; Cai, Hao 1 ; Li, Tong 1 ; Chen, Fang 1 ; Tu, Shuchen 2 ; Huang, Hongwei 1 ; Xu, Xinxin 4 ;

作者机构： 1.China Univ Geosci Beijing, Engn Res Ctr Minist Educ Geol Carbon Storage & Low, Sch Mat Sci & Technol, Beijing Key Lab Mat Utilizat Nometall Minerals & S, Beijing 100083, Peoples R China

2.South China Normal Univ, SCNU Environm Res Inst, Guangdong Prov Key Lab Chem Pollut & Environm Saft, Guangzhou 510006, Peoples R China

3.South China Normal Univ, Sch Environm, MOE Key Lab Theoret Chem Environm, Guangzhou 510006, Peoples R China

4.Chinese Acad Agr Sci, Biotechnol Res Inst, 12 Zhongguancun South St, Beijing 100081, Peoples R China

关键词： CdBiO 2 Br; Oxygen vacancies; Localized internal electric field; Photocatalytic performance; Piezocatalytic performance

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 361 卷

页码：

收录情况： SCI

摘要： The construction of efficient catalysts driven by both solar light and mechanical stress is meaningful for utilizing a more broad range of renewable energy. Defect engineering has recently attracted intense research interests owing to its unique advantages in catalytic performance enhancement. In this study, we hydrothermally synthesized CdBiO2Br (CBOB) with various oxygen vacancy concentrations, which realizes efficient photocatalytic and piezocatalytic performance. The introduction of oxygen vacancies (OVs) reduces the work function to increase the electron density for creating a localized internal electric field (LIEF) within CBOB, which plays critical role in enhancing the separation and migradation of photogenerated charges. Therefore, the optimal CBOB catalyst (CBOB-OV2) exhibits a photocatalytic degradation efficiency of tetracycline (TC) of 86.07% within 45 min, which is 4.53 times higher than the bulk CBOB. The effects of catalyst dosage, pollutant concentration, and coexisting ions on photodegradation efficiency are also studied. Besides, the presence of OVs also enhances the piezoelectric properties of CBOB, resulting in a 1.71-fold increase in piezocatalytic TC degradation. The study not only illustrates the role of OVs in enhancing photocatalytic and piezocatalytic performance but also provides fresh insights for the development of high-efficiency catalysts triggered by multiple forms of renewable energies.

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