TiO_2-SBA-15负载镧催化剂的制备、表征及光催化降解甲基橙

以SBA-15为载体,钛酸四丁酯为钛源,采用溶胶-凝胶法制备负载TiO2的SBA-15分子筛,先通过浸渍法将不同质量浓度的硝酸镧负载到TiO2-SBA-15上,再用高温焙烧法制备不同镧负载量的TiO2-SBA-15催化剂.采用X射线衍射(XRD)、红外光谱(FT-IR)、电感耦合等离子体(ICP)发射光谱、透射电镜(TEM)及N2吸附-脱附等温线对系列催化剂进行表征.用负载镧的TiO2-SBA-15催化剂对甲基橙溶液进行光降解,考察镧的负载量对甲基橙降解率的影响.实验结果表明:当镧的负载量为0.14%,紫外灯照射140min时,甲基橙的降解率为100%.

Preparation,Characterization and Photocatalytic Degradation MethylicOrange of TiO2-SBA-15 with Lanthanum Loading Catalyst

Using SBA 15 as carrier and tetrabutyl titanate as titanium source, the SBA 15 molecular sieve loaded with TiO₂ was prepared by sol gel method. The different mass concentrations of lanthanum nitrate were loaded onto TiO₂-SBA-15 by impregnation method, and TiO₂-SDA-15 catalysts with different lanthanum loading were prepared by high temperature calcination method. The series of catalysts were characterized by X-ray diffraction (XRD), infrared spectrum (FT IR), inductively coupled plasma (ICP) emission spectrum, transmission electron microscopy (TEM) and N₂ adsorption desorption isotherm. The TiO₂-SBA-15 catalysts with different La mass contents were used as photo catalysts to degrade the solution of methyl orange. We investigated the effect of La loading mass content on the degradation rate of methyl orange. The experimental results show that the degradation rate of methyl orange is 100% when La loading mass content is 0.14% and UV lamp irradiation for 140 min.