Photocatalytic property of perovskite bismuth titanate

摘要

Bismuth titanate Bi_4Ti_3O_12 was prepared by using the chemical solution decomposition (CSD) method.The obtained powders were characterized by X-ray diffraction (XRD),UV-Vis spectroscopy.Photocatalytic property of Bi_4Ti_3O_12 crystals was evaluated by using methyl orange as a model organic compound.The factors affecting the photocatalytic activity,such as calcination condition for the photocatalyst,the pH value of the reaction suspension,the strong oxidant species additives H_2O_2 and the addition of NaCl,NaNO_3 and K_2SO_4 into the suspension,have been studied.The band gap energy value for Bi_4Ti_3O_12 compound is 3.08 eV observed by a UV-Vis recording spectrophotometer.Bi_4Ti_3O_12 exhibits photocatalytic activities to photodegrade methyl orange.The bond angle of Ti-O-Ti in Bi_4Ti_3O_12 and the formed intra-electric field between the (Bi_2O_2)~2+ layer and the (Bi_2Ti_3O_10)2~ layer are assumed to motivate the separation of the photogenerated electrons-holes pairs and then improve the photocatalytic activity of the catalysts.? 2004 Elsevier B.V All rights reserved.