Preparation of nanosized Bi3NbO7 and its visible-light photocatalytic property.
A nanosized Bi(3)NbO(7) was synthesized by the sol-gel method. The as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), UV-vis diffuse reflectance spectrum, X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmet-Teller (BET). The UV-vis diffuse reflectance spectrum of the sample obtained by the sol-gel method showed a markedly blue-shift as compared to that of the sample obtained by the solid-state reaction. The band gap of the Bi(3)NbO(7) nanoparticles was estimated to be about 2.43-2.59eV. XPS analysis confirmed that the mixed valence bismuth existed in the crystal structure of the photocatalyst and niobium in the compound Bi(3)NbO(7) was in the Nb(5+) valence state. The as-prepared nanopowders exhibited a high photocatalytic activity in the decomposition of acid red G in water and acetone in air under visible-light irradiation, which may be assigned to larger specific surface area and the oxygen vacancies and mixed valence bismuth in the structure of Bi(3)NbO(7).
Zhang
Gaoke
G
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, PR China. gkzhang@whut.edu.cn
Yang
Junling
J
Zhang
Shuiming
S
Xiong
Qian
Q
Huang
Baibiao
B
Wang
Junting
J
Gong
Wenqi
W
D000096:Acetone / Q000737:chemistry / Q000528:radiation effects; D000393:Air Pollutants / Q000737:chemistry / Q000528:radiation effects; D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D008027:Light; D053758:Nanoparticles / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000138:chemical synthesis / Q000737:chemistry*; D055668:Photochemical Processes; D012235:Rhodamines / Q000737:chemistry / Q000528:radiation effects; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects
D000393:Air Pollutants; D010087:Oxides; D012235:Rhodamines; D014874:Water Pollutants, Chemical; D009556:Niobium; D000096:Acetone; C022027:lissamine rhodamine B; D001729:Bismuth