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The binary adsolubilization behaviors of 2-naphthol+biphenyl and 2-naphthol+1,3-dichlorobenzene in a cationic fluorocarbon surfactant adsorbed layer formed on TiO 2 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 TiO 2 and the surfactant. The adsolubilized sites for binary adsolubilization of 2-naphthol+1,3-dichlorobenzene are also discussed from the admicellar partitioning coefficients.

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