Preparation and photocatalytic properties of BiOX matrix composites
As one of the BiOX materials,BiOI has the advantages of narrow band gap and strong absorption of visible light.In this paper,TiO2-BIOI composites were prepared by solvothermal method using TiO2 as raw materials,and the effects of different TiO2 composites on the structure and photocatalytic performance of the materials were investigated by XRD,SEM,TEM,UV-vis,PL and photocatalytic degradation.The results showed that TiO2with spherical particles was distributed between the layers of BiOI,whose combination im-proved the light response ability of the composite material in the visible light region and reduced the bandgap width.The emission spectra showed that TiO2-BiOI had an intrinsic emission peak at 467 nm,and the emission peak intensity decreased first and then increased slightly with the increase of TiO2 mass fraction,and the PL in-tensity of TiO2-BioI-30％was the lowest.Using methyl orange solution to simulate the degradation wastewater,the photocatalytic degradation rate of methyl orange by TiO2-BiOI composites increased first and then decreased with the increase of TiO2 composite mass fraction.At 180 min,the degradation rate of methyl orange by TiO2-BioI-30％was up to 99.57％,which was 100.62％higher than that by pure BiOI.After repeated use for 5 times,the degradation rate is still as high as 97.02％,which has excellent reuse performance.
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