Preparation and Photocatalytic Properties of TiO2-BiOBr Composites
In our present study,in order to improve the visible light photocatalytic performance of BiOBr,TiO2-BiOBr was synthesized by microwave method with different molar ratio of TiO2 and BiOBr.The effect of TiO2-BiOBr on the degrada-tion of organic pollutant rhodamine B was then studied.The prepared catalysts were further characterized by scanning elec-tron microscopy(SEM),X-ray powder diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and UV-visible absorp-tion spectrum(UV-vis).The results showed that compared with pure TiO2 and BiOBr,the photocatalytic ability of TiO2-BiOBr in the visible light region was greatly improved,and the quantity ratio of substances with the highest visible photo-catalytic degradation efficiency was n(TiO2)∶n(BiOBr)=1∶12.The improvement of photocatalytic activity of TiO2-BiOBr composite catalyst is due to the attachment of TiO2 particles on the BiOBr layered structure and the outward growth of the structure,which is beneficial to the dominant growth of BiOBr(110)crystal plane with photocatalytic activity.A unique heterostructure was also formed between TiO2 and BiOBr,both of which effectively improved the separation efficiency of photogenerated electrons and holes.
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