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The oil shale residues from oil production were taken as raw material and cationic surfactant as modifier, the hydroxyl groups on the aggregated silica surface were alkylated directly. The structure of alkylated Si-hydroxyl on modified silica surface was characterized by means of infrared spectroscopy, nuclear magnetic resonance analysis, thermal gravimetric analysis and scanning electron microscopy analysis. The results showed that the modified silica was obtained and modification rate of surface hydroxyl groups is about 84%.The modification conditions were optimized on the base of the application of orthogonal experimental method, and the optimum parameters are that the reaction temperature is 40℃, pH value is within the range of 9-10 and the molar ratio of cationic surfactant to silica surface hydroxyl is 2:1.

KEYWORDS

residue of oil shale; silica white; modification;cationic surfactant;characterization

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Autor: Yingmei Xu, Qi Ji, Jiawei Shi, Demin He, Dongmei Wang, Jun Guan, Qiumin Zhang

Fuente: http://www.scirp.org/

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