H_3PW_(12)O_(40)/TiO_2复合分子印迹材料的制备及光催化性能

Preparation and Photocatalytic Properties of H_3PW_(12)O_(40)/TiO_2 Molecular Imprinting Polymers

因TiO_2降解污染物不具有选择性,因此利用分子印迹技术加以改性,采用溶胶-凝胶法制备了H_3PW_(12)O_(40)/TiO_2复合分子印迹催化剂。利用XRD、TEM、PC对其进行了表征,并探讨了其对DBP和竞争污染物PNP的光催化活性和选择性能。结果表明:改性后复合材料晶型没有改变,且分散性较好,光生电子和空穴分离效率较高。当DBP:H_3PW_(12)O_(40)/TiO_2=1:7时催化剂的光催化活性最好,对目标分子DBP的降解率最高可达95%;且在竞争污染物PNP与目标分子DBP同时存在的情况下,对目标分子DBP有较高的选择性吸附和选择性降解。

As TiO2 has the disadvantage of not selectively degrading pollutants,therefore,molecular imprinting technology is used to modify,H3PW12O40/TiO2 molecular imprinting catalyst was prepared by sol-gel method.It was characterized by XRD,TEM,PC and discussed the photocatalytic activity and selection properties of DBP and PNP.The conclusion is that:after modification,the crystal type of composite material did not change,and the dispersion is better,separation efficiency of photoelectrons and carriers is high.When the DBP:H3PW12O40/TiO2 was 1:7,the photocatalytic activity is the best,the degradation rate of DBP can reach 95%;in the meantime,when the PNP and the target molecular DBP exist simultaneously,the target molecule DBP has high choices of adsorption and selective degradation.