Novel preparation method for a new visible light photocatalyst: mesoporous TiO2 supported Ag/AgBr
Novel preparation method for a new visible light photocatalyst: mesoporous TiO2 supported Ag/AgBr
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新型可见光光催化剂：介孔TiO2负载Ag/AgBr的新制备方法
DOI：
10.1039/c2jm14628b
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发表时间：
2012-02
影响因子：
--
通讯作者：
Shi, Lei
中科院分区：
文献类型：
--
作者：
Wang, Desong;Duan, Y;ong;Luo, Qingzhi;Li, Xueyan;An, Jing;Bao, Leilei;Shi, Lei
开发了一种制备表面沉积有Ag和AgBr纳米颗粒的介孔TiO2的新方法。在介孔TiO2的制备过程中，采用十六烷基三甲基溴化铵(CTAB)作为模板剂和溴源。采用溶胶-凝胶法合成含有 CTAB 的介孔 TiO2，并将其浸入 AgNO3 溶液中形成介孔 AgBr/TiO2 纳米复合材料。 AgBr/TiO2纳米复合材料受到可见光照射加速AgBr的光解，形成介孔Ag/AgBr/TiO2光催化剂。通过小角X射线衍射(SAXRD)、广角X射线衍射(WAXRD)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(UV-Vis DRS)、X射线光电子能谱(XPS)、俄歇电子能谱(AES)和N2等温表征Ag/AgBr/TiO2光催化剂。 吸附-解吸。 Ag/AgBr/TiO2 在可见光照射下对甲基橙的降解表现出较高的光催化活性。光催化反应遵循一级动力学，Ag/AgBr/TiO2光催化降解甲基橙的速率常数（k）分别是介孔TiO2（M-TiO2）、商业TiO2（P-25）和Ag/AgBr/SiO2的63.6、36.1和2.7倍。循环运行实验表明Ag/AgBr/TiO2光催化剂具有优异的光催化稳定性。还讨论了Ag/AgBr/TiO2 的可见光光催化机理。
A new method for the preparation of mesoporous TiO2 with a surface deposited with nanoparticles of Ag and AgBr was developed. Cetyltrimethylammonium bromide (CTAB) was used as both a template agent and bromine source in the preparation process of the mesoporous TiO2. Mesoporous TiO2 containing CTAB was synthesized by a sol–gel method, and was dipped into AgNO3 solution to form a mesoporous AgBr/TiO2 nanocomposite. The AgBr/TiO2 nanocomposite was irradiated by visible light to accelerate photolysis of AgBr, forming mesoporous Ag/AgBr/TiO2 photocatalyst. The Ag/AgBr/TiO2 photocatalyst was characterized by small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (WAXRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and N2 isothermal adsorption–desorption. Ag/AgBr/TiO2 exhibits high photocatalytic activity for the degradation of methyl orange under visible light irradiation. The photocatalytic reaction follows the first-order kinetics and the rate constant (k) for the degradation of methyl orange photocatalyzed by Ag/AgBr/TiO2 is 63.6, 36.1 and 2.7 times that of mesoporous TiO2 (M-TiO2), commercial TiO2 (P-25), and Ag/AgBr/SiO2, respectively. The recycling runs experiment shows that the photocatalytic stability of the Ag/AgBr/TiO2 photocatalyst is excellent. The visible light photocatalytic mechanism of Ag/AgBr/TiO2 is also discussed.
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