Preparation, Structure And Properties Of Mesoporous WO₃/TiO₂ Composite Photocatalytic Materials

WO3-TiO2 composite photocatalytic materials were prepared from Ti(SO4)2 and by one step hydrothermal synthesis method. The microstructure and properties were characterized by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and ultraviolet-visible (UV-Vis) spectra analysis. The visible-light photocatalytic degradation of WO3-TiO2 composites for RhB solution was investigated by comparing with that of commercial P25 and pure TiO2. The results indicated that the WO3-TiO2 composite powders showed higher visible-light photocatalytic activity than the commercial P25 and pure TiO2 powders, which were prepared under the same process parameters with WO3-T1O2 composites. The WO3-TiO2 composites with W/Ti (mol ratio)=0.02:1 exhibited best photocatalytic activity, and the photocatalytic degradation rate of 0.1g WO3-TiO2 sample for 20ml 1×10-5 mol/L RhB solution can reach 98.09% after 5h.Then a series of mesoporous WO3-TiO2 composite materials with different molar ratios of P123:(W+Ti) were prepared by hydrothermal synthesis method using P123 as template with different calcination temperatures. The microstructure and properties were characterized by using X ray diffraction(XRD), scanning electron microscope (SEM), Brunauer-Emmet-Teller (BET) N2 adsorption-desorption and ultraviolet-visible (UV-Vis) spectra analysis. The visible-light and Uv irradiation photocatalytic degradation of mesoporous WO3-TiO2 composite materials for Rhodamine B(RhB) solution was investigated. The results indicated that the mesoporous WO3-TiO2 composite materials showed higher Uv and visible light photocatalytic activity. The as-prepared mesoporous WO3-TiO2 composite materials with 0.2 mol% of P123:(W+Ti) and calcined at 500℃ exhibited best photocatalytic activity under Uv irradiation, and the photocatalytic degradation rate of 0.5g sample for 200ml 1×10-5 mol/L RhB solution can reach 99.08% after 35min. The mesoporous WO3-TiO2 composite materials with 0.8 mol% of P123:(W+Ti) and calcined at 500℃ exhibit best photocatalytic activity under visible-light, and the photocatalytic degradation rate of 0.5g sample for 200ml 1×10-5 mol/L RhB solution can reach 99.19% after 140min.Then a series of mesoporous WO3-TiO2 composite materials were prepared by sol-gel method using P123 as templates with different molar ratios of P123:(W+Ti) and calcined at 500℃. The microstructure and properties were characterized by using X ray diffraction(XRD), scanning electron microscope(SEM), Brunauer-Emmet-Teller (BET) N2 adsorption-desorption and ultraviolet-visible(UV-Vis) spectra analysis. The visible-light photocatalytic degradation of mesoporous WO3-TiO2 composite materials for Rhodamine B (RhB) solution was investigated. The results indicated that the mesoporous WO3-TiO2 composite materials showed higher visible-light photocatalytic activity. The mesoporous WO3-TiO2 composite materials with 0.6 mol% of P123:(W+Ti) for degradation of RhB exhibited best photocatalytic activity, and the photocatalytic degradation rate of 0.5g sample for 200ml 1 x 10-5 mol/L RhB solution can reach 97.7% after 140min.