Coating mechanism of nano-TiO_2 films on the surface of ultra-fine calcined coal kaolin particles

A new type of mineral composite was made by calcined coal kaolin.The interaction mechanism of an inorganic modification reagent TiOSO4 with the surface of ultra-fine calcined coal kaolin particles（substrate） was studied by X-ray photoelectron spectroscopy.The results show that chemisorption exists i...

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Bibliographic Details
Published in:矿物冶金与材料学报：英文版 2011-08, Vol.18 (4), p.487-493
Main Author: Hai Lin Ying-bo Dong
Format: Article
Language:English
Subjects:
X射线光电子能谱
二氧化钛纳米粒子
土颗粒
水合二氧化钛
烧煤
纳米二氧化钛薄膜
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Summary:A new type of mineral composite was made by calcined coal kaolin.The interaction mechanism of an inorganic modification reagent TiOSO4 with the surface of ultra-fine calcined coal kaolin particles（substrate） was studied by X-ray photoelectron spectroscopy.The results show that chemisorption exists in the phase boundary between the modification agent and the substrate surface,while physical adsorption occurs on the modification layers of hydrate titanium dioxide.The interaction force was calculated and analyzed according to DLVO theory between ultra-fine calcined coal kaolin particles and hydrate titanium dioxide nano-particles in the modification system.It is shown that the both electrostatic force and van der Waals force are attractive,and the coacervation between ultra-fine calcined coal kaolin particles and hydrate titanium dioxide nano-particles leads to the coating of hydrate titanium dioxide on the surface of ultra-fine calcined coal kaolin particles.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-011-0467-0