Binary Adsolubilization of Organic Compounds in a Fluorocarbon Surfactant Adsorbed Layer Formed on Titanium Dioxide

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  • ESUMI Kunio
    Department of Applied Chemistry and Institute of Colloid and Interface Science
  • NAKAGAWA Sayaka
    Department of Applied Chemistry and Institute of Colloid and Interface Science
  • YOSHIMURA Tomokazu
    Department of Applied Chemistry and Institute of Colloid and Interface Science

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  • 二酸化チタンに形成されたフッ化炭素界面活性剤吸着層への二種類の有機化合物の吸着可溶化

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Abstract

The binary adsolubilization behaviors of 2-naphthol +biphenyl and 2-naphthol +1, 3-dichlorobenzene in a cationic fluorocarbon surfactant adsorbed layer formed on TiO2 have been investigated as a function of pH. In the binary adsolubilization of 2-naphthol+biphenyl, the adsolubilized amount of 2-naphthol increases gradually until pH 7 and then sharply with a further increase of pH, whereas the adsolubilization of biphenyl is not observed in the wide pH region. In the binary adsolubilization of 2-naphthol +1, 3-dichlorobenzene, the adsolubilization behavior of 2-naphthol shows a similar trend as that of 2-naphthol +biphenyl system, while the adsolubilized amount of 1, 3-dichlorobenzene increases gradually with pH from 3 to 10. The enhancement in the adsolubilization of 2-naphthol at high pH is attributed to the interaction between deprotonated 2-naphthol and the cationic surfactant as well as the increase of interaction between negatively charged TiO2 and the surfactant. The adsolubilized sites for binary adsolubilization of 2-naphthol +1, 3-dichlorobenzene are also discussed from the admicellar partitioning coefficients.

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