Construction of Bi based photoreactors and study on the photocatalytic degradation performance of wastewater
Bi系光反应器的构建及其光降解污水性能的研究

摘要

本文采用水热法制备成功了 Bi₂O₂CO₃以及不同 Bi₂O₂CO₃修饰量的 Bi₂O₂CO₃/多孔功能陶瓷复合光催化剂。之后为了研究样品的化学组成、外貌形态和禁带宽度，在实验采用了 XRD、SEM和紫外-可见漫反射等多种表征方法。以亚甲基蓝溶液为降解物，在可见光下以 Bi₂O₂CO₃/多孔功能陶瓷为催化剂进行降解实验，研究了复合光催化的光催化性能。实验结果表明，在 Bi2O2CO3/多孔功能陶瓷复合光催化剂中，当 Bi₂O₂CO₃修饰量为 15% 时， Bi₂O₂CO₃/多孔功能陶瓷复合光催化剂的降解性能最好，为38.3%。通过五次循环实验表明，实验中 Bi₂O₂CO₃/多孔功能陶瓷复合光催化剂比 Bi₂O₂CO₃粉体的稳定性好且更加易于回收。猝灭实验表明，羟基自由基（·OH）在降解过程中发挥了重要作用，是催化剂的主要活性成分。随后， Bi₂O₂CO₃/多孔功能陶瓷复合催化剂被用于降解溶液中的四环素，表明 Bi₂O₂CO₃/多孔功能陶瓷复合催化剂也能有效降解药物生产过程中的四环素废液。综上所述，本研究成功制备出了一种具有高效光催化性能、良好稳定性的复合 Bi₂O₂CO₃/多孔功能陶瓷光催化剂，为解决环境中的水污染问题提供了一种有效良好的理论研究基础。

Abstract

In this paper, Bi₂O₂CO₃ and Bi₂O₂CO₃/porous functional ceramic composite photocatalysts with different Bi₂O₂CO₃ modification amounts were successfully prepared by hydrothermal method. Then, in order to study the chemical composition, morphology and band gap of the sample, various characterization methods such as XRD, SEM and UV-Vis diffuse reflection were used in the experiment. The photocatalytic performance of composite photocatalysis was studied by using methylene blue solution as degradant and Bi₂O₂CO₃/porous functional ceramics as catalyst under visible light. The experimental results show that in the Bi₂O₂CO₃/porous functional ceramic composite photocatalyst, when the Bi₂O₂CO₃ modification amount is 15%, the degradation performance of Bi₂O₂CO₃/porous functional ceramic composite photocatalyst is the best, which is 38.3%. The five-cycle experiment shows that the Bi₂O₂CO₃/porous functional ceramic composite photocatalyst has better stability and is easier to recover than Bi₂O₂CO₃ powder. Quenching experiments showed that hydroxyl radicals (·OH) plays an important role in the degradation process and is the main active ingredient of the catalyst. Subsequently, Bi₂O₂CO₃/porous functional ceramic composite catalyst was used to degrade tetracycline in solution, indicating that Bi₂O₂CO₃/porous functional ceramic composite catalyst can also effectively degrade tetracycline waste liquid in drug production. In summary, a composite Bi₂O₂CO₃/porous functional ceramic photocatalyst with high efficiency photocatalytic performance and good stability was successfully prepared, which provided an effective and good theoretical research basis for solving the problem of water pollution in the environment.