Taiwan Institute of Chemical Engineers;Elsevier B.V
摘要:
摘要： •A peroxy method was used to prepare V-TiO2 sol.•It was neutral and highly stable without any surfactant.•The shape of particle was rhombus and possessed high aspect ratio.•V-TiO2 was in anatase and nanosize after preparation.•V-TiO2 is more active than TiO2 because it produces more photogenerated electrons and holes. A sol–gel method was used to prepare V-doped TiO2 sol. TiCl4 was converted to Ti(OH)4 and H2O2 was then added to convert it to TiO2 at high temperature. The sols with various contents of V were used to prepared thin films on glass substrate by dip-coating method. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, high resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy, and UV–vis spectroscopy. The photocatalytic activities of the V-TiO2 thin films were investigated by the degradation of methylene blue under UV light irradiation. The as-prepared V-TiO2 sol was neutral and showed high stability of nanoparticles suspended in the sol without any surfactant. The shape of particle was rhombus and possessed high aspect ratio. The V-TiO2 particles were in anatase and nanosize, so they do not need annealing process to form crystals after coating on the substrate. V doping can produce more photogenerated electrons and holes, which improved the photocatalytic activity. However, overdoes V in TiO2 would lead to form the recombination centers and suppressed the activity. The optimum NH4VO3/TiO2 weight ratio in starting materials was 3%. 出版者： Elsevier B.V 出版日期： 2015-07-01 出處： Journal of the Taiwan Institute of Chemical Engineers, 2015-07, Vol.52, p.140-146 資源來源： ScienceDirect (Elsevier) Journals 版權： 2015 Taiwan Institute of Chemical Engineers 識別號： ISSN: 1876-1070 識別號： EISSN: 1876-1089 識別號： DOI: 10.1016/j.jtice.2015.02.006
