三维有序大孔杂化材料3DOM PW11Ni-APS-TiO2紫外光催化降解罗丹明B

采用甲醇法制备三维有序大孔结构(3DOM)TiO2，再经过有机胺(EtO)3Si(CH2)3NH2(APS)功能化修饰后，通过自组装技术将取代型杂多酸盐K5Ni(H2O)PW11O39](PW11Ni)与其负载，从而制备了三维有序大孔取代型多金属氧酸盐-有机胺-TiO2杂化催化剂3DOM PW11Ni-APS-TiO2。通过FT-IR，ICP-AES，XRD，UV-Vis/DRS, XPS和SEM等测试手段对其组成、结构和形貌等进行了表征，结果表明,通过自组装技术将APS功能化修饰的3DOM TiO2与杂多酸盐PW11Ni负载后，该杂多酸盐PW11Ni通过Ni-N配位键与3DOM TiO2键合。同时，所制备的3DOM PW11Ni-APS-TiO2具有TiO2锐钛矿结构，且该合成产物由于模板剂聚苯乙烯(PS)胶球的作用呈现着规则、有序和开放性的三维有序大孔结构，其通透性的孔结构十分有利于反应过程中反应物和产物分子的扩散。紫外光催化降解罗丹明B实验结果表明，3DOM PW11Ni-APS-TiO2的紫外光催化降解活性明显高于直接光解和其他对比体系。

Photocatalytic Activity of Three Dimensional Ordered Macroporous Hybrid Catalysts 3DOM PW11Ni-APS-TiO2 for Rhodamine B under UV Light Irradiation

The three dimensional ordered macroporous(3DOM) TiO2 was prepared in methanol bath with soaking polystyrene spheres, and it was further functionalized using 3-aminopropyltriethoxysilane(APS). Amine-functionalized 3DOM TiO2 material impregnated with K5Ni(H2O)PW11O39](PW11Ni) was prepared by coordination of nickel(Ni) of POM, with the amine groups on the surface of 3DOM TiO2. The obtained material was well characterized by Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD), UV-Vis diffuse reflectance spectra (UV-Vis/DRS), X-ray photoelectron spectroscopy(XPS), and Scanning electron microscopy(SEM). The results showed that the primary Keggin structure was remained intact in as-prepared composite, at the same time; PW11Ni was successfully bonded on 3DOM TiO2 by Ni-N bond with the APS as the coupling agent. 3DOM PW11Ni-APS-TiO2 had anatase crystalline structure; moreover, the 3DOM structure was the opening and permeability macroporous which could significantly improve the accessibility of diffusing species. Compared to PW11Ni, 3DOM TiO2 and PW11Ni-APS-TiO2, the activity of 3DOM PW11Ni-APS-TiO2 was revealed better under UV photocatalytic degradation of Rhodamine B(RB).