title: In Situ Fabrication of Bi2Ti2O7/TiO2 Heterostructure Submicron Fibers for Enhanced Photocatalytic Activity.
abstract: A facile two-step synthesis route combining electrospinning and hydrothermal techniques has been performed to obtain Bi2Ti2O7/TiO2 heterostructured submicron fibers. Bi2Ti2O7 nanosheets were grown on the surface of TiO2 submicron fibers. The density of the nanosheets increased with higher precursor concentration of the Bi/Ti reaction raw materials. UV-visible (UV-vis) diffuse reflectance spectroscopy indicated that the absorption spectrum of the Bi2Ti2O7/TiO2 composite extended into the visible-light region. Photocatalytic tests showed that the Bi2Ti2O7/TiO2 heterostructures possess a much higher degradation rate of rhodamine B than the unmodified TiO2 submicron fibers under visible light. The enhanced photocatalytic activity can be attributed to the synergistic effect between improved visible-light absorption and the internal electric field created by the heterojunctions. The effective separation of photogenerated carriers driven by the photoinduced potential was demonstrated by the photoelectrochemical analysis.
authors.affiliation: School of Physics and Information Engineering, Jianghan University, Wuhan, 430056, China. zhdijhu@gmail.com.
authors.forename: Di
authors.initials: D
authors.lastname: Zhou
authors.affiliation: School of Physics and Information Engineering, Jianghan University, Wuhan, 430056, China.
authors.forename: Hu
authors.initials: H
authors.lastname: Yang
authors.affiliation: School of Physics and Information Engineering, Jianghan University, Wuhan, 430056, China.
authors.forename: Yafang
authors.initials: Y
authors.lastname: Tu
authors.affiliation: School of Physics and Information Engineering, Jianghan University, Wuhan, 430056, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Faculty of Physics and Electronic Technology, Hubei University, Wuhan, 430062, China.
authors.forename: Yaxuan
authors.initials: Y
authors.lastname: Cai
authors.affiliation: Laboratory of Low-Dimension Functional Nanostructures and Devices, Hubei University of Science and Technology, Xianning, 437100, China.
authors.forename: Zhenglong
authors.initials: Z
authors.lastname: Hu
authors.affiliation: School of Physics and Information Engineering, Jianghan University, Wuhan, 430056, China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Zhu
keywords: Bismuth titanate; Heterostructure; Hydrothermal; Photocatalyst; Visible light