Adsorption of Methyl Orange on Magnetically Separable Mesoporous Titania Nanocomposite

doi:10.1016/j.cjche.2014.09.015

Abstract

Abstract: The adsorption of mesoporous Fe₃O₄-SiO₂-TiO₂ (MFST), which can be separated easily from solution by a magnet, for the removal ofmethyl orange (MO)was investigated. The nitrogen adsorption-desorption measurement shows successful synthesis of MFST with an average pore size of 3.8 nm and a large specific surface area of 55 m²·g^-1. About 95% adsorption percentage of MO is achieved with an initial concentration of 10 mg·L^-1 in the dark and the MFST exhibits superior adsorption ability under acid conditions. The adsorption data fit well with the pseudo-second order model for adsorption. After 4 cycles, the adsorption rate for MO remains 74% in the dark and the MFST can be recovered in a magnetic field with a recovery of about 80% (by mass). It demonstrates that the samples have significant value on applications of wastewater treatment.

Key words: Mesoporous Fe₃O₄-SiO₂-TiO₂, Adsorption, Methyl orange, Pseudo-second order model

摘要： The adsorption of mesoporous Fe₃O₄-SiO₂-TiO₂ (MFST), which can be separated easily from solution by a magnet, for the removal ofmethyl orange (MO)was investigated. The nitrogen adsorption-desorption measurement shows successful synthesis of MFST with an average pore size of 3.8 nm and a large specific surface area of 55 m²·g^-1. About 95% adsorption percentage of MO is achieved with an initial concentration of 10 mg·L^-1 in the dark and the MFST exhibits superior adsorption ability under acid conditions. The adsorption data fit well with the pseudo-second order model for adsorption. After 4 cycles, the adsorption rate for MO remains 74% in the dark and the MFST can be recovered in a magnetic field with a recovery of about 80% (by mass). It demonstrates that the samples have significant value on applications of wastewater treatment.

关键词: Mesoporous Fe₃O₄-SiO₂-TiO₂, Adsorption, Methyl orange, Pseudo-second order model

Libo Gao, Qiang Zhang, Junyang Li, Ruiting Feng, Hongyan Xu, Chenyang Xue. Adsorption of Methyl Orange on Magnetically Separable Mesoporous Titania Nanocomposite[J]. , 2014, 22(10): 1168-1173.

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