Rahman Zia Ur, Wei Ning, Feng Yange, Zhang Xiaolong, Wang Daoai
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Qingdao Center of Resource Chemistry and New Materials, Qingdao, 266100, China.
Chem Asian J. 2018 Feb 16;13(4):432-439. doi: 10.1002/asia.201701786. Epub 2018 Jan 25.
A facile method was used to prepare hollow mesoporous TiO and Au@TiO spheres using polystyrene (PS) templates. Au nanoparticles (NPs) were simultaneously synthesized and attached on the surface of PS spheres by reducing AuCl ions using sodium citrate which resulted in the uniform deposition of Au NPs. The outer coating of titania via sol-gel produced PS@Au@TiO core-shell spheres. Removing the templates from these core-shell spheres through calcination produced hollow mesoporous and crystalline Au@TiO spheres with Au NPs inside the TiO shell in a single step. Anatase spheres with double Au NPs layers, one inside and another outside of TiO shell, were also prepared. Different characterization techniques indicated the hollow mesoporous and crystalline morphology of the prepared spheres with Au NPs. Hollow anatase spheres with Au NPs indicated enhanced harvesting of visible light and therefore demonstrated efficient catalytic activity toward the degradation of organic dyes under the irradiation of visible light as compared to bare TiO spheres.
采用一种简便的方法，以聚苯乙烯（PS）模板制备中空介孔TiO和Au@TiO球。通过柠檬酸钠还原AuCl离子，同时合成金纳米颗粒（NPs）并将其附着在PS球表面，从而实现Au NPs的均匀沉积。通过溶胶 - 凝胶法在其外包覆二氧化钛，得到PS@Au@TiO核壳球。通过煅烧从这些核壳球中去除模板，一步制备出中空介孔且结晶的Au@TiO球，TiO壳内含有Au NPs。还制备了具有双层Au NPs的锐钛矿球，一层在TiO壳内部，另一层在TiO壳外部。不同的表征技术表明所制备的含Au NPs的球具有中空介孔和结晶形态。含Au NPs的中空锐钛矿球显示出对可见光的增强捕获，因此与裸TiO球相比，在可见光照射下对有机染料的降解表现出高效的催化活性。
