Multiple heterojunction system of Bi2MoO6/WO3/Ag3PO4 with enhanced visible-light photocatalytic performance towards dye degradation

Multiple heterojunction system of Bi2MoO6/WO3/Ag3PO4 was designed via constructing binary heterojunction Bi2MoO6/WO3, followed by the deposition of nano-Ag3PO4 on the surface of Bi2MoO6/WO3. Various techniques were employed to characterize the properties of the as-prepared catalytic system. In this study, the decomposition efficiency of C.I. reactive blue 19 (RB-19) was used as a measure of photocatalytic activity and the Bi2MoO6/WO3/Ag3PO4 composite exceeded its stand-alone components (pristine Ag3PO4, WO3/Ag3PO4 and Bi2MoO6/Ag3PO4) by 3.16 times, 2.63 times and 1.75 times, respectively. The photocatalytic tests implied that the construction of multiple heterojunction could achieve efficient separation of photo-generated electrons and holes. A possible photocatalytic mechanism for Bi2MoO6/WO3/Ag3PO4 system was also proposed according to the results of trapping experiments. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.