Bi2O2CO3/ Bi4Ti3O12复合异质结光催化材料制备及性能研究
作者:
作者单位:

1.南京信息工程大学环境科学与工程学院;2.南京信息工程大学雷丁学院

基金项目:

国家自然科学基金(51978342)


Preparation and Performance Study of Bi2O2CO3/Bi4Ti3O12 Composite Heterojunction Photocatalytic Materials
Author:
Affiliation:

1.Nanjing University of Information Science and Technology School of Environmental Science and Engineering;2.Nanjing University of Information Science and Technology School of Reading Academy

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    采用原位生成法制备了Bi2O2CO3/Bi4Ti3O12复合异质结光催化剂,通过一系列表征手段,研究了所制备材料的晶体结构、微观形貌、元素组成和光电性能。通过在可见光下降解抗生素氧氟沙星,研究了所制备光催化剂的降解活性。实验结果表明,复合光催化剂的降解活性优于单一组分光催化剂,其中最佳复合样品BTC-2的表观速率常数为纯Bi2O2CO3和Bi4Ti3O12的6.3倍和2.2倍。4次循环实验说明复合样品有着良好的稳定性。根据电化学测试结果得知,BOC/BTO复合光催化剂有着良好的光生载流子分离效率和优秀的电荷迁移效率,所以对氧氟沙星展现出良好的降解活性。自由基捕获实验说明光催化实验中BOC/BTO复合的主要活性物种是空穴和超氧自由基。此外,通过自由基捕获实验和能带理论,提出了电荷转移路径和提高活性的机理。

    Abstract:

    Bi2O2CO3/Bi4Ti3O12 composite heterojunction photocatalyst was prepared using in-situ generation method. The crystal structure, microstructure, elemental composition, and optoelectronic properties of the prepared material were studied through a series of characterization methods. The degradation activity of the prepared photocatalyst was studied by degrading the antibiotic ofloxacin under visible light. The experimental results show that the degradation activity of the composite photocatalyst is superior to that of a single component photocatalyst, and the optimal composite sample BTC-2 has an apparent rate constant that is 6.3 times and 2.2 times that of pure Bi2O2CO3 and Bi4Ti3O12, respectively. The 4 cycles of experiments indicate that the composite sample has good stability. According to the electrochemical test results, it was found that the BOC/BTO composite photocatalyst has good photo generated carrier separation efficiency and excellent charge transfer efficiency, thus exhibiting good degradation activity towards ofloxacin. The free radical capture experiment indicates that the main active species of BOC/BTO composites in photocatalytic experiments are holes and superoxide radicals. In addition, charge transfer pathways and mechanisms for enhancing activity were proposed through free radical capture experiments and band theory.

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谢梦娟,刘泽宇,徐晶晶. Bi2O2CO3/ Bi4Ti3O12复合异质结光催化材料制备及性能研究[J].南京信息工程大学学报,,():

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  • 收稿日期:2024-06-04
  • 最后修改日期:2024-10-04
  • 录用日期:2024-10-08

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