Abstract
N-doped BiPO4 photocatalyst was synthesized by a simple one step hydrothermal method. The crystal structure, morphology, and photophysical properties of the samples were characterized by XRD, SEM, XPS, UV–Vis and Raman. The valence and conduction bands, density of states and the band gap energy of BiPO4 are calculated with first-principles. The results showed that both BiPO4 and N-doped BiPO4 have same monoclinic structure. The substitution of O2− by N3− ions in BiPO4 could not only cause the red-shift of the adsorption edge, but also change the morphology. The photocatalytic activity of BiPO4 was enhanced about 50% under UV light irradiation when the molar ratio of N/Bi is 0.2, this can be ascribed to the N3− introduced into BiPO4 crystal lattice restrain the recombination of photogenerated electron–hole pairs. However, overdoping would decrease the photocatalytic activity of BiPO4.
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