Preparation and photocatalytic performance of TiO2-SiO2 composites
In this paper,a new TiO2-SiO2 composite was prepared by sol-gel and the efficiency of rhodamine B(RhB)in photocatalytic dye wastewater was investigated.The samples were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),photoluminescence spectroscopy(PL)and other instruments.The results show that the binding of TiO2 to SiO2 inhibits the anatase to rutile transition,thus reducing the chance of an electron-hole re-combination.We found that the TiO2-SiO2 composites had the highest photocatalytic activity when the SiO2 content was 40％and the calcination temperature was 800 ℃.Moreover,the composites have good catalytic sta-bility,and·O2-is the main active species during the photocatalytic degradation of RhB.
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