X-Ray absorption spectroscopy (EXAFS/XANES) evidence for the preferential formation of isolated VO4 species on highly photoactive V2O5/SiO2 catalysts
Abstract
Vanadium K-edge XANES and EXAFS studies revealed that the surface vanadium oxide species of V2O5/SiO2 prepared by impregnating silica with a basic solution (NaOH) of ammonium metavandate is dominantly an isolated tetrahedral VO4 species, which brings about an enhanced photocatalytic activity.