摘要:
采用一锅水热法制备了片层花簇状Bi2MoO6/Bi2WO6复合物,并以其为载体,将Ag3PO4通过原位生长的方式沉积在其表面,设计出一种新型的Bi2MoO6/Bi2WO6/Ag3PO4复合双Z-scheme型结构的光催化剂,考察了复合催化剂在可见光下降解罗丹明B(RhB)的催化活性。研究表明,当Ag3PO4在复合物中的质量分数为5%时,复合催化剂在可见光下具有最佳的光催化活性,在120 min内对RhB的降解率高达99.15%。Bi2MoO6、Bi2WO6和Ag3PO4三者的协同作用有效提高了对可见光的吸收能力,所构建的双Z型异质结可改变光生电子的传输路径,进而促使光生电子空穴的分离,从而获得显著的光催化活性。根据捕获实验和能带理论分析,提出了一种双Z-scheme型光催化剂的作用机理。
关键词:
光催化,
双Z-scheme型异质结,
Bi2MoO6/Bi2WO6/Ag3PO4复合材料,
可见光响应
Abstract:
Layered Bi2MoO6/Bi2WO6 composites were prepared by a one pot hydrothermal method and Ag3PO4 was deposited on its surface through in-situ growth with it as a supporter. A new type of Bi2MoO6/Bi2WO6/Ag3PO4 composite dual Z-scheme heterojunction photocatalyst was designed. The catalytic activity of the composite catalyst for the degradation of RhB under visible light was investigated. Experiments showed that when the mass fraction of Ag3PO4 in the complex was 5%, the composite catalysts exhibited optimal photocatalytic activity under visible light, with a degradation rate of 99.15% for RhB within 120 minutes. The synergistic effect of Bi2MoO6, Bi2WO6, and Ag3PO4 effectively improved the absorption ability of visible light. The constructed double Z-scheme heterojunction could change the transmission path strength of photo generated electrons, which promoting the separation of photo generated electron holes. As a result, significant photocatalytic activity was obtained. Based on capture experiments and band theory analysis, a dual Z-scheme photocatalytic mechanism was proposed.
Key words:
photocatalysis,
dual Z-scheme heterojunction,
Bi2MoO6/Bi2WO6/Ag3PO4 composites,
visible light drive
中图分类号:
董玮, 林莉, 顾怀章, 罗云强, 马平, 李向阳. 双Z型异质结Bi2MoO6/Bi2WO6/Ag3PO4的光催化研究[J]. 工业水处理, 2024, 44(8): 81-89.
Wei DONG, Li LIN, Huaizhang GU, Yunqiang LUO, Ping MA, Xiangyang LI. Photocatalytic properties of dual Z-scheme Bi2MoO6/Bi2WO6/Ag3PO4 heterojunction[J]. Industrial Water Treatment, 2024, 44(8): 81-89.