纳米TiO2/CuO复合材料仿生合成及其光催化特性

以钛酸四丁酯为钛源,甘氨酸为模板剂,水热法合成纳米TiO2/CuO复合材料,采用XRD、SEM、FT-IR、XPS、UV-VIS DRS等分析手段对TiO2/CuO复合材料的晶型结构、形貌、粒径及组成进行表征.结果表明,XRD、SEM证实TiO2/CuO复合材料由锐钛矿型TiO2和CuO组成,形貌呈花瓣薄片状纳米花球,花瓣厚约15 nm;FT-IR、XPS表明其含有Ti—O键和Cu—O键,且Ti呈+4价、Cu呈+2价;UV-VIS DR显示其在紫外-可见光区具有显著的光吸收能力.相比P25型TiO2,TiO2/CuO复合材料具有较好的光催化性能,光催化降解亚甲基蓝(MB)的效率高达85%.这可能由于TiO2/CuO复合材料具有宽的可见光区域和窄的带隙,以及CuO对电子的捕获,促进了光生电子和空穴有效分离.

Biomimetic synthesis of TiO2/CuO nanocomposites and its photocatalytic properties

TiO2/CuO nanocomposites were prepared by hydrothermal method using tetrabutyl titanate as the titanium source, glycine as the template. The samples were characterized by SEM, XRD, XPS, FT-IR, UV-VIS DRS and so on, analyzing its morphology, crystal structure and particle size composition, etc. The results indicated that nanoparticles were composed of anatase TiO2 and CuO, and the morphology was like Petals flaky nano ball, pwhose thickness was 15 nm. The data of FT-IR, XPS showed that it contained Ti—O bonds and the Cu—O bonds, while Ti was present +4 valence and Cu was +2 valence. The figure of UV-VIS DRS demonstrated that it had a significant light absorption capacity in its UV-visible region. Compared to with P25, TiO2/CuO composite materials had good photocatalytic performance. The photocatalytic efficiency of nanocomposites for MB was as much as 85%. This may be due to the TiO2/CuO composite materials with wide visible light region and narrow band gap, as well as the electronic capture of CuO, promoting the photoproduction effective separation of electrons and holes.