Solubilization of organic compounds into as-synthesized spherical mesoporous silica

Literature Information

Publication Date 2002-05-10
DOI 10.1039/B200074C
Impact Factor 3.676
Authors

Yoshikazu Miyake, Toshimi Yumoto, Hajime Kitamura, Taichi Sugimoto


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Abstract

Spherical mesoporous silica was prepared by dispersing tetrabutoxysilane (TBOS) in an alkaline solution into which a cationic surfactant had been dissolved. The spherical mesoporous silica was prepared within the limited concentration regions of the surfactant. The diameter of the spherical mesoporous silica was about 500 μm, and the BET specific surface area was above 1000 m2 g−1. Within the as-synthesized spherical mesoporous silica, phenol and some organic compounds in aqueous phase were solubilized into the hydrophobic free space consisting of the hydrocarbon group of surfactants. The extent of solubilization was correlated with equilibrium concentration in aqueous phase by a Langmuir-type equation. The maximum solubilization for phenol was proportional to the BET specific surface area of the calcined spherical mesoporous silica. For some organic compounds maximum solubilization was directly proportional to a hydrophobic index of the organic compound, log (POW), where POW is the distribution coefficient between the octanol and water phases.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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