The composing effect of bismuth on titania hollow microspheres for their visible-light photocatalytic activity. (18th October 2022)

• Record Type: Journal Article
• Authors: Han, Yimin; Wang, Bo; Xiang, Quanjun; Li, Wensheng
• Is Part Of: New journal of chemistry. Volume 46:Number 42(2022)
• Page Start: 20445
• Page End: 20455
• Publication Date: 2022-10-18
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj04296g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Bi-composed TiO2 hollow microspheres with enhanced visible-light photocatalytic activity are prepared by an impregnation–calcination method. Abstract : Bismuth-composed titania hollow microspheres are fabricated by an impregnation–calcination method using hydrothermally prepared titania hollow microspheres as precursors and Bi(NO3 )3 as the Bi resource. A series of characterization methods and analyses, including scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N2 adsorption–desorption isotherms, Fourier transform infrared spectroscopy and UV-vis spectroscopy were carried out to confirm the successful synthesis of Bi-TiO2 photocatalysts. The photocatalytic activity is evaluated by photocatalytic decolorization of methyl orange (MO) aqueous solution at ambient temperature under visible-light irradiation. The results show that Bi-composing greatly enhances the visible-light photocatalytic activity of TiO2 hollow microspheres. When the atomic ratio of Bi/Ti ( R Bi ) is increased from 0 to 0.5, the photocatalytic activity of the samples increases. In particular, at R Bi = 0.5, it shows the highest photocatalytic activity. The Bi-components contain two narrow band gap semiconductors of Bi2 O3 and Bi4 Ti3 O12 on the surface of TiO2 hollow microspheres. The results imply that Bi-composing induces the shift of the absorption edge into the visible-light range and the enhancement of visible-light absorption. Furthermore, the formation of the Bi2 O3 /TiO2 heterojunction and the special multilayer crystal structure of Bi4 Ti3 O12 could efficiently reduce the recombination of photo-generated electrons and holes.