2016 Volume 49 Issue 4 Pages 366-371
The present study investigates rod-like BiPO4 prepared by a hydrothermal process using bismuth nitrate and sodium dihydrogen phosphate as raw materials. Herein, Ag–AgBr was deposited onto the surface of BiPO4 via a facile precipitation–photoreduction technique. The structure, morphology, composition and optical property of as-synthesized samples were characterized by XRD, SEM, TEM, XPS, DRS and PL techniques. The results showed that introduction of Ag–AgBr did not change the structure and morphology of BiPO4, but extended its optical absorption to visible region. Moreover, the introduction of Ag–AgBr shifted binding energy of elements of BiPO4 to lower values, which implied that a strong interaction exists between Ag–AgBr and BiPO4. The photocatalytic tests showed that the Ag/AgBr/BiPO4 composites possess higher photocatalytic activity for degradation of anthraquinone dye (reactive brilliant blue KN-R) under simulated sunlight, as compared to that of pure BiPO4. The improvement of photocatalytic activity for Ag/AgBr/BiPO4 composites could be ascribed to their good optical absorption and the synergistic action between Ag–AgBr and BiPO4 substrate (the synergistic action effectively retarded recombination of photogenerated carriers in hetero-structured Ag/AgBr/BiPO4).