文獻(xiàn)名： Rational design of visible-light-sensitive Ag-BiVO4 oxides by matching redox potentials of catalyst, dyes, and reactive oxygen species towards more efficient photocatalytic degradation

 

作者： Andrei Lebedev^a，Franklin Anariba^ab，Xu Li^c，Ping Wu^a

^aEntropic Interface Group, Engineering Product Development, Singapore University of Technology and Design, Singapore

^bMaterials Surface Group, Science and Math, Affiliated to Engineering Product Development, Singapore University of Technology and Design, Singapore

^cA-Star, Institute of Materials Research and Engineering (IMRE), Singapore

 

 

 

摘要：By employing a rational design approach of matching redox potentials of dye, catalysts, and reactive oxygen species (ROS), Ag-BiVO₄ photo-catalysts of 2, 5 and 7?wt% Ag were successfully prepared via sol-gel and UV photo-reduction methods. The as-prepared composites over-perform existing counterparts by exhibiting excellent photocatalytic properties towards degradation of cationic methylene blue (MB, 20?min, 90.9?±?2.4 %), brilliant green (BG, 20?min, 84.0?±?2.7 %) and rhodamine B (RhB, 120?min, 90.5?±?3.3 %) as well as anionic acid red 1 (AR, 60?min, 79.0?±?2.5 %) and methyl orange (MO, 120?min, 64.9?±?2.0 %) dyes. Furthermore, based on our novel approach of rational design, the degradation of MB dye was ascribed to photoelectrons from n-type BiVO₄, while degradation of MO and AR was attributed to photo-holes from p-type Ag₂O. Meanwhile, BG and RhB dyes degrade due to photoelectrons and photo-oxidation by ROS, which was confirmed by carrier scavenger experiments. Results indicate that Ag-BiVO₄ oxide can be efficiently used for wastewater treatment, solar energy, water splitting, and medicine.