二维六方p6mm有序介孔WO_3-TiO_2复合材料的制备及其可见光光催化性能

以非离子型表面活性剂为模板剂,采用蒸发诱导自组装法制备了一系列不同WO3含量的有序介孔WO3-TiO2复合材料,并表征了其孔结构、形貌、孔隙率、光谱性质及组成.结果表明,该材料呈二维六方p6mm对称和锐钛矿晶相结构;与无序WO3-TiO2复合材料相比,其比表面积(152～154m2/g)更大,孔径更均一(5.3nm),且比纯TiO2的帯隙宽度(3.0eV)更窄.将该WO3-TiO2样品用于可见光光催化降解水相中罗丹明B和2,4-二氯苯氧乙酸的反应中,发现WO3含量适当的有序介孔WO3-TiO2样品的光催化活性比无序的样品和纯TiO2的更高.

Preparation of 2D Hexagonal p6mm Ordered Mesoporous WO3-TiO2 Composite Materials and Their Visible-Light Photocatalytic Activity

A series of ordered mesoporous WO3-TiO2 composite materials with different WO3 loadings were prepared by using a single step nonionic-surfactant-templating combined with evaporation-induced self-assembly(EISA) technique.The mesostructure,morphology,porosity,optical property,and composition of as-prepared materials were characterized.The characterization results confirmed that the ordered composite materials exhibited 2D hexagonal p6mm symmetry and anatase phase structure with larger BET surface area(152-154 m2/g) and more uniform pore size(5.3 nm) compared with the disordered WO3-TiO2 composite material as well as narrow bandgap(3.0 eV) with respect to pure TiO2.Subsequently,the ordered mesoporous composite materials were successfully applied to the degradation of rhodamine B and 2,4-dichlorophenoxy acetic acid in the liquid phase under visible-light(? ? 400 nm) irradiation,and enhanced photocatalytic activity compared with the disordered WO3-TiO2 composite material and pure TiO2 was obtained for the samples with suitable WO3 loadings.