有序介孔材料H6P2W18O62/TiO2(Brij-76)的制备与微波增强光催化降解一氯苯

采用非离子表面活性剂C18H37(OCH2CH2)10OH(Brij-76)作为模板剂, 在以杂多酸H6P2W18O62对TiO2掺杂改性基础上, 通过模板-溶胶-凝胶-程序升温溶剂热一步法在较低温度下制备了有序复合介孔材料H6P2W18O62/TiO2(Brij-76). 通过傅立叶变换红外(FT-IR)光谱, X射线衍射(XRD), 扫描电子显微镜(SEM), 能量色散X射线(EDX), N2吸附-脱附测定和NH3程序升温脱附(NH3-TPD)等手段对其进行了表征. 结果表明, 以非离子表面活性剂Brij-76为模板剂制得的复合材料H6P2W18O62/TiO2(Brij-76)平均孔径约为3.31 nm, BET比表面积为99.78 m2·g-1. 与TiO2相比, 其孔径有序性大幅度提高, 粒子的聚集度降低, 表面酸性显著增加. 微波增强光催化性能研究结果显示, H6P2W18O62/TiO2(Brij-76)在微波作用下催化活性更高, 可有效地降解一氯苯溶液.

Preparation of Periodic Mesoporous H6P2W18O62/TiO2(Brij-76) Composite and Microwave Enhanced Photocatalytic Degradation of Monochlorobenzene

The H6P2W18O62/TiO2 (Brij-76) composite was prepared by a combination of the nonionic surfactant polyethylene glycol octadecyl ether polyoxyethulene 10 stearyl ether (C18H37(OCH2CH2)10OH)(Brij-76) as the template and a single-step sol-gel-hydrothermal method. The as-synthesized composite was characterized by Fourier transform infrared (FT-IR) spectrum, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), N2 adsorption-desorption and NH3-temperature programmed desorption (NH3-TPD). Results showed that the average pore diameter of the composite H6P2W18O62/TiO2(Brij-76) was ca 3.31 nm, and it had a large surface area of 99.78 m2·g-1. Additionally, the aggregation of particles was effectively inhibited and the surface acidity increased substantially. The photocatalytic elimination of monochlorobenzene was used as a model reaction to evaluate the microwave enhanced photocatalytic activity of the composite, and the results showed that the composite H6P2W18O62/TiO2 (Brij-76) could effectively degradate monochlorobenzene and had high catalytic activity under microwave irradiation.