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文獻名： 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 Lebedeva，Franklin Anaribaab，Xu Lic，Ping Wua
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.
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