CdS/Sr2Bi2O5 复合光催化剂的制备、表征及性能测试

Subjects: Materials Science >> Materials Chemistry submitted time 2022-10-19 Cooperative journals: 《桂林电子科技大学学报》

周俊峰 钟 燕 黄 涛 桑 湉 胡朝浩

Abstract： On the basis of solid phase sintering to prepare single-phase Sr2Bi2O5, a series of CdS/Sr2Bi2O5 composite photocatalytic materials were prepared by chemical precipitation method to solve the problem of organic pollutants in environmental
pollution. The composite photocatalyst was characterized by XRD, SEM, TEM, EDS and XPS, and its photocatalytic performance was evaluated by degrading MB. After experiments, it is found that the CdS/Sr2Bi2O5 composite photocatalyst consists of two phases: CdS and Sr2Bi2O5. The morphology of agglomerated Sr2Bi2O5 particles is attached to the irregular CdS particles, and the surface of the two phases are in close contact with each other, forming an obvious boundary, and forming a heterojunction. When CdS/Sr2Bi2O5 mole ratio is 1/1, the visible photocatalytic performance is the best, the degradation efficiency of MB reached 95% in 40min, and three cycle tests show that the photocatalyst had good stability and repeatability.The significantly improved photocatalytic performance is mainly attributed to the formation of heterojunction between CdS and Sr2Bi2O5 phases in the composite photocatalyst, which accelerates the separation of photoelectron-generated hole pairs and effectively inhibits the recombination of photoelectron-generated hole pairs.

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