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采用表面分子印迹技术,以溶胶-凝胶法制备的掺氮TiO_2为基质、水杨酸为模板分子、甲基丙烯酸为功能单体、乙二醇二甲基丙烯酸酯和偶氮二异丁腈分别为交联剂和引发剂制备了掺氮TiO_2分子印迹聚合物。通过傅立叶红外光谱(FT-IR)、X射线衍射(XRD)、透射电镜(TEM)、紫外-可见光漫反射吸收光谱(UV-Vis DRS)和低温N2物理吸附-脱附等技术对制备样品进行了表征。结果表明,样品均为锐钛矿相,粒径10~20 nm且分布均匀;氮掺杂引起光吸收带边红移;表面分子印迹技术在掺氮TiO_2表面形成的有机聚合物层增大了粒径,但改变了回滞环形状及孔径分布,形成了大量孔径为2.2 nm的小孔并增大了比表面积;可见光下对水杨酸、甲基橙、苯甲酸的降解选择系数在1.1~1.7之间,具有良好的选择性。
The surface molecular imprinting technique was used to fabricate the doped TiO 2 as matrix, salicylic acid as template, methacrylic acid as functional monomer, ethylene glycol dimethacrylate and azobisisobutyronitrile Nitrogen-doped TiO 2 molecularly imprinted polymers were prepared respectively for cross-linking agent and initiator. The prepared samples were characterized by FT-IR, XRD, TEM, UV-Vis DRS and N2 adsorption-desorption Characterization. The results show that the samples are anatase phase with the size of 10 ~ 20 nm and uniform distribution. Nitrogen doping causes red shift of light absorption band edge. The surface molecular imprinting technique increases the amount of organic polymer layer formed on the surface of the doped TiO_2 But changed the hysteresis loop shape and pore size distribution, forming a large number of pores with a diameter of 2.2 nm and increasing the specific surface area. Under visible light, the degradation selectivity of salicylic acid, methyl orange and benzoic acid was 1.1 ~ 1.7 between, with good selectivity.