Preparation And Photocatalytic Properties Of Phosphotungstic Acid/Titanium Dioxide Composite Molecular Imprinted Material

TiO₂ has the disadvantage of not selectively since the degradation of organic pollutants,In this paper, the molecular imprinting technique was used to modify the H₃PW₁₂O₄₀/TiO₂ composite materials, and the H₃PW₁₂O₄₀/Ti O2 composite molecular imprinted material was prepared.The crystal structure, morphology and optical absorption properties of the materials were characterized.The photocatalytic activity and selective properties of H₃PW₁₂O₄₀/TiO₂ composite molecular imprinted material were investigated by photocatalytic degradation experiments and competition experiments. Specific studies are as follows:1. Using sol-gel method, using dibutyl phthalate?DBP? as the template molecule,dibutyl phthalate as titanium source and can be mixed template to functional monomer precursor template molecule DBP and H₃PW₁₂O₄₀/TiO₂ composites with different proportion of H₃PW₁₂O₄₀/TiO₂ composite molecular imprinted materials were prepared.The materials were characterized by transmission electron microscopy?TEM?, X- ray powder diffraction?XRD?, UV visible diffuse reflectance spectroscopy?Uv-Vis?, X- ray photoelectron spectroscopy?XPS?, Fourier infrared spectroscopy?FTIR?, and scanning electron microscopy?SEM?.Characterization results show that, H₃PW₁₂O₄₀/TiO₂ composite molecular imprinted material having anatase structure; H₃PW₁₂O₄₀/TiO₂ composite imprinted materials have a strong absorption peak at 200⁴00 nm, and the absorption capacity of composite is enhanced compared with the H₃PW₁₂O₄₀/TiO₂ composites; In the process of preparation, the material is removed by 420 ? and the template molecules are removed without affecting the morphology, structure and properties of the material.2. The photocatalytic properties of H₃PW₁₂O₄₀/TiO₂ composite molecular imprinted material were evaluated by using the prepared catalyst under simulated sunlight to photocatalytic degradation DBP water solution and Binary solution with competitive pollutant. The results showed that: When the ratio of DBP and H₃PW₁₂O₄₀/TiO₂ is 1:7, the photocatalytic activity is best, and the degradation rate of DBP can reach 95%. at 120 min.In the presence of PNP or DMP in the target degradation solution, the H₃PW₁₂O₄₀/TiO₂ composite molecular imprinted materials exhibit high selectivity, which can be selectively degraded DBP in Binary solution. It can be proved that H₃PW₁₂O₄₀/TiO₂ composite molecular imprinted materials has a specific imprinted cavities.