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	Film-coating process of hydrated alumina on TiO2 particles
	Wu, HX ; Wang, TJ ; Jin, Y
	2010-05-07 ; 2010-05-07
关键词	TITANIUM-DIOXIDE SURFACE CHARACTERIZATION OXIDE PRECIPITATION WATER XPS Engineering, Chemical
中文摘要	The mechanism of the film-coating process of hydrated alumina on TiO2 particles in aqueous solution was experimentally studied. pH and zeta-potential changes during the mixing process of the TiO2 suspension and Al-2(SO4)(3) solution were investigated. TiO2 particles obviously promote the hydrolysis of Al-2(SO4)(3) in both acidic and basic solutions and adsorb positively charged OH-Al species in slurries. A static repulsion dominates the suspension system of OH-Al species and TiO2 particles, in which they randomly collide with each other because they carry the same sign of charge. When the OH-Al species or TiO2 particles have enough energy to cross the repulsion threshold, the -OH groups on the surface of the TiO2 particles will condense with the OH-Al species, leading to the coating of OH-Al species on the surface of the TiO2 particles. However, completely inelastic collisions also occur between the OH-Al species, and the formation of hydrous alumina is unavoidable unless the local concentration of the coating reagent in the suspension is well controlled. The morphology and surface chemical states of coated TiO2 particles were also analyzed by high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). TiO2 particles coated with hydrous alumina exhibit electrokinectic behavior similar to that of pure Al(OH)(3) gel.
语种	英语 ; 英语
出版者	AMER CHEMICAL SOC ; WASHINGTON ; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/17240]
专题	清华大学
推荐引用方式 GB/T 7714	Wu, HX,Wang, TJ,Jin, Y. Film-coating process of hydrated alumina on TiO2 particles[J],2010, 2010.
APA	Wu, HX,Wang, TJ,&Jin, Y.(2010).Film-coating process of hydrated alumina on TiO2 particles..
MLA	Wu, HX,et al."Film-coating process of hydrated alumina on TiO2 particles".(2010).

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