CATIONIC SURFACTANT ADSOLUBILIZATION OF 2-NAPHTHOL AND NAPHTHALENE WITH TITANIUM-DIOXIDE HAVING DODECYL CHAIN

Adsolubilization of 2-naphthol and naphthalene by cationic surfactant- adsorbed layers formed on titanium dioxides with or without a dodecyl chain was investigated, The cationic surfactants used were dodecyltrim ethylammonium bromide and 1,2-bis(dodecyldimethylammonio) ethane dibro mide (2RenQ), It was found that the adsolubilized amounts of 2-naphtho l and naphthalene increase and reach a maximum and then decrease for b oth surfactants and titanium dioxides with or without the dodecyl chai n, where in the absence of surfactants the incorporated amount of naph thalene on the titanium dioxide with the dodecyl chain is markedly lar ge, The adsolubilized amounts of 2-naphthol and naphthalene were enhan ced with the titanium dioxide with the dodecyl chain by adsorption of surfactants, in particular 2RenQ, The admicellar partitioning coeffici ents also showed that naphthalene is adsolubilized preferentially rath er than 2-naphthol and the surface treatment with the dodecyl chain en hances the adsolubilization for two adsolubilizates. (C) 1997 Academic Press.