Photocatalytic properties of dual Z-scheme Bi2MoO6/Bi2WO6/Ag3PO4 heterojunction

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.

Keywords

• photocatalysis
• dual z-scheme heterojunction
• bi2moo6/bi2wo6/ag3po4 composites
• visible light drive