%0 Journal Article
%T Efficient Visible-Light Photocatalytic Properties in Low-Temperature Bi-Nb-O System Photocatalysts
%A Haifa Zhai
%A Haiqin Li
%A Hongying Luo
%A Jizhou Kong
%A Liuyang Zheng
%A Panpan Li
%A Shuying Shang
%J Archive of "Nanoscale Research Letters".
%D 2016
%R 10.1186/s11671-016-1583-6
%X Low-temperature Bi-Nb-O system photocatalysts were prepared by a citrate method using homemade water-soluble niobium precursors. The structures, morphologies, and optical properties of Bi-Nb-O system photocatalysts with different compositions were investigated deeply. All the Bi-Nb-O powders exhibit appreciably much higher photocatalytic efficiency of photo-degradation of methyl violet (MV), especially for Bi-Nb-O photocatalysts sintered at 750 ¡ãC (BNO750), only 1.5 h to completely decompose MV, and the obtained first-order rate constant (k) is 1.94/h. A larger degradation rate of Bi-Nb-O photocatalysts sintered at 550 ¡ãC (BNO550) can be attributed to the synergistic effect between ¦Â-BiNbO4 and Bi5Nb3O15. Bi5Nb3O15 with small particle size on ¦Â-BiNbO4 surface can effectively short the diffuse length of electron. BNO750 exhibits the best photocatalytic properties under visible-light irradiation, which can be attributed to its better crystallinity and the synergistic effect between ¦Â-BiNbO4 and ¦Á-BiNbO4. The small amount of ¦Á-BiNbO4 loading on surface of ¦Â-BiNbO4 can effectively improve the electron and hole segregation and migration. Holes are the main active species of Bi-Nb-O system photocatalysts in aqueous solution under visible-light irradiation
%K Bi-Nb-O photocatalyst
%K Citrate method
%K Visible-light photocatalytic property
%K Synergistic effect
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5005240/