Preparation and Characterization of Amphiphilic w/o-SiO2-void-TiO2 Core-shell Microspheres

doi:10.3724/SP.J.1077.2014.13373

Abstract

Abstract: SiO₂-void-TiO₂ core-shell microspheres were successfully prepared via double-coating with polyfurfuryldehyde and silica, and then removing the mid-layer to create a nanovoid layer between TiO₂ core and silica shell. The surfaces of SiO₂-void-TiO₂ were modified by partial alkylsilylation of n-octadecyltrimethoxysilane to render the surface with amphiphilicity to prepare w/o-SiO₂-void-TiO₂. Both the SiO₂-void-TiO₂ and the w/o-SiO₂-void-TiO₂ were characterized using XRD, TEM, BET, FT-IR and UV-Vis DRS techniques. Results demonstrated that the as-prepared SiO₂-void-TiO₂ and w/o-SiO₂-void-TiO₂ showed core(TiO₂)-hollow-shell(silica) microspherical structure. The w/o-SiO₂-void-TiO₂ sample was amphiphilic core-shell microspheres and it could be easily located at the boundary of the dual-phase mixture. Under UV light irradiation for 180 min, the methylene blue degradation rate of SiO₂-void-TiO₂ and w/o-SiO₂-void-TiO₂ photocatalysis reached 89.4% and 83.8%, respectively. Based on these results, possible mechanisms of SiO₂-void-TiO₂ core-hollow-shell microspheres formation and partial modification were discussed.

Key words: amphiphilic, core-shell microsphere, photocatalysis, preparation

CLC Number:

O644

MA Zhan-Ying, YAO Bing-Hua, ZHANG Ping. Preparation and Characterization of Amphiphilic w/o-SiO₂-void-TiO₂ Core-shell Microspheres[J]. Journal of Inorganic Materials, 2014, 29(4): 364-370.

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Preparation and Characterization of Amphiphilic w/o-SiO₂-void-TiO₂ Core-shell Microspheres

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