Meso-C@TiO_2@Ag复合光催化剂的制备及其可见光催化性能

Preparation and Visible Light Photocatalytic Activity of Meso-C@TiO_2@Ag Composite Photocatalyst

采用混合溶剂法,通过改变钛酸四丁酯(TBOT)的量合成一系列不同比例的RF@TiO_2核-壳结构,于氮气气氛600℃下煅烧得到meso-C@TiO_2,进一步对所得产物表面进行贵金属沉积最终得到meso-C@TiO_2@Ag复合光催化剂。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、全自动比表面积及微孔物理吸附仪(BET)等对样品的成份、形貌和结构进行了表征。结果表明,成功制备了meso-C@TiO_2@Ag三元介孔复合光催化材料,并且比表面积达到173.9 m^2/g。在可见光照射下,以降解亚甲基蓝为模型,探讨了TBOT用量以及Ag负载量对产物光催化性能的影响。研究发现,当加入TBOT的量为0.3 m L、AgNO_3的投入量为10wt%时,所制备的meso-C@TiO_2@Ag对亚甲基蓝的降解效果最佳,40 min内降解率接近100%,性能明显优于市售的纳米二氧化钛P25。

RF@ TiO2 composite core-shell spheres were prepared by changing the amount of tetrabutyl titanate （TBOT） with a mixed solvent method, and then calcined at 600℃in nitrogen atmosphere to ob- tain mesoporous C@ TiO2 （meso-C@ TiO2）. Finally, noble metal Ag was deposited on the surface of meso-C@ TiO2 to obtain meso-C@ TiO2@ Ag. The composition, morphology and structure of me-so-C@ TiO2 @ Ag were investigated by X-ray diffraction （XRD）, scanning electron microscope （SEM）, transmission electron microscopy（TEM） and N2 adsorption-desorption measurement（BET）. The results showed that the meso-C @ TiO2 @ Ag composite photocatalyst was successfully synthesized and the BET surface area was up to 173.9 mZ/g. Methylene blue as a degradation model was used to evaluate the photocatalytic activity of the obtained samples under visible light, and the effects of the amount of TBOT and Ag on photocatalytic activity of meso-C@ TiO2@ Ag were discussed. When the amount of TBOT was 0.3 mL and the adding amount of AgNO3 was 10wt%, the methylene blue degradation by meso-C@ TiO2 @ Ag was nearly 100% in 40 min, which was much better than the commercial P25.