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	Using phosphoric acid as a catalyst to control the structures of mesoporous titanium dioxide materials
	Huang, D ; Luo, GS ; Wang, YJ
	2010-05-07 ; 2010-05-07
关键词	phosphoric acid titanium dioxide mesoporous TIO2 SILICA ROUTE Chemistry, Applied Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary
中文摘要	In order to control the surface area, pore size, pore volume as well as the phase structure of prepared mesoporous titanium dioxide materials in a template-free synthesis process, a catalyzed hydrolysis and polycondensation reactions of tetrabutyl titanate with phosphoric acid as a catalyst have been carried out. The main factors of the hydrolysis ratio (H2O/Ti molar ratio) and the phosphoric acid concentration were studied systematically. The calcined TiO2 materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and nitrogen adsorption/desorption measurements. A variety of TiO2 materials with different physicochemical properties could be effectively obtained by adjusting the synthesis conditions. X-ray powder diffraction patterns and nitrogen adsorption/desorption isotherms reveal that the afforded titanium dioxide materials have anatase structures and the mesoporous characteristics, respectively. TEM results indicate that the disordered wormhole-like mesostructure without discernible long-range order is formed by the agglomerization of TiO2 nanoparticles. The structures of the prepared materials could be controlled very well. The surface area varied from 41 m(2)/g to 294 m(2)/g, the average pore size from 5.4 nm to 9.4 nm, and the total pore volume from 0.056 cm(3)/g to 0.545 cm(3)/g. The phosphoric acid concentration is a dominating factor to control the pore size and its distribution. A unimodal or bimodal pore size distribution can result from changing the phosphoric acid concentration. (c) 2005 Elsevier Inc. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/17874]
专题	清华大学
推荐引用方式 GB/T 7714	Huang, D,Luo, GS,Wang, YJ. Using phosphoric acid as a catalyst to control the structures of mesoporous titanium dioxide materials[J],2010, 2010.
APA	Huang, D,Luo, GS,&Wang, YJ.(2010).Using phosphoric acid as a catalyst to control the structures of mesoporous titanium dioxide materials..
MLA	Huang, D,et al."Using phosphoric acid as a catalyst to control the structures of mesoporous titanium dioxide materials".(2010).

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