Porous TiO2-coated Magnetic Core-Shell Nanocomposites：Preparation and Enhanced Photocatalytic Activity

doi:10.1016/S1004-9541(13)60521-2

Abstract

Abstract: The core-shell structured TiO₂/SiO₂@Fe₃O₄ photocatalysts were prepared using Fe₃O₄ as magnetic core, tetraethoxysilane (TEOS) as silica source and tetrabutyl titanate (TBOT) as titanium sources. The as-obtained structure was composed of a SiO₂@Fe₃O₄ core and a porous TiO₂ shell. The diameter of SiO₂@Fe₃O₄ core was about 205 nm with thickness of porous TiO₂ of about 5-6 nm. The 9%TiO₂/6% SiO₂@Fe₃O₄ microspheres possess the highest BET surface area and the BJH pore volume, which are 373.5 m²穏^-1 and 0.28 cm³穏^-1, respectively. The 9%TiO₂/6%SiO₂@Fe₃O₄ photocatalyst exhibited an excellent performance for the degradation of methyl orange and methylene blue dyes. Two different dyes were completely decolorized in 60 min under UV irradiation. The photocatalytic activity and the amount of catalyst were almost not decrease after recycling for 6 times by using external magnetic field.

Key words: photocatalyst, magnetic microspheres, porous TiO₂, dyestuff, degradation

摘要： The core-shell structured TiO₂/SiO₂@Fe₃O₄ photocatalysts were prepared using Fe₃O₄ as magnetic core, tetraethoxysilane (TEOS) as silica source and tetrabutyl titanate (TBOT) as titanium sources. The as-obtained structure was composed of a SiO₂@Fe₃O₄ core and a porous TiO₂ shell. The diameter of SiO₂@Fe₃O₄ core was about 205 nm with thickness of porous TiO₂ of about 5-6 nm. The 9%TiO₂/6% SiO₂@Fe₃O₄ microspheres possess the highest BET surface area and the BJH pore volume, which are 373.5 m²穏^-1 and 0.28 cm³穏^-1, respectively. The 9%TiO₂/6%SiO₂@Fe₃O₄ photocatalyst exhibited an excellent performance for the degradation of methyl orange and methylene blue dyes. Two different dyes were completely decolorized in 60 min under UV irradiation. The photocatalytic activity and the amount of catalyst were almost not decrease after recycling for 6 times by using external magnetic field.

关键词: photocatalyst, magnetic microspheres, porous TiO₂, dyestuff, degradation

LIU Hongfei, JI Shengfu, ZHENG Yuanyuan, LI Ming, YANG Hao. Porous TiO₂-coated Magnetic Core-Shell Nanocomposites：Preparation and Enhanced Photocatalytic Activity[J]. Chin.J.Chem.Eng., 2013, 21(5): 569-576.

刘鸿飞, 季生福, 郑园园, 李明, 杨浩. Porous TiO₂-coated Magnetic Core-Shell Nanocomposites：Preparation and Enhanced Photocatalytic Activity[J]. Chinese Journal of Chemical Engineering, 2013, 21(5): 569-576.

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Porous TiO₂-coated Magnetic Core-Shell Nanocomposites：Preparation and Enhanced Photocatalytic Activity

Porous TiO₂-coated Magnetic Core-Shell Nanocomposites：Preparation and Enhanced Photocatalytic Activity

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