Highly Efficient Adsolubilization of 2-Naphthol on Alumina by Anionicand Nonionic Surfactant Mixtures

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  • ESUMI Kunio
    Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo
  • OKAMOTO Naoko
    Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo
  • YOSHIMURA Tomokazu
    Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo

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  • 陰イオン性と非イオン性界面活性剤混合系を用いたアルミナ粒子上での2-ナフトールの高効率な吸着可溶化

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Abstract

The adsolubilization of 2-naphthol by mixtures of an anionic surfactant, sodium dodecyl sulfate (SDS), and nonionic surfactants, hexaoxyethylenedecyl ether (C10E6), and hexaoxyethylenedodecyl ether (C12E6) on alumina was investigated. Adsorption and adsolubilization were performed using a feed concentration of SDS under various fixed concentrations of the nonionic surfactants. The adsolubilization of 2-naphthol increased with an increase of the fixed nonionic surfactant concentration, showed a maximum and then decreased with a further increase of nonionic surfactant concentration for both SDS/C10E6 and SDS/C12E6 systems. The adsolubilization of 2-naphthol was greater for SDS/C10E6 and SDS/C12E6 systems than that for SDS single system. Furthermore, the adsolubilization efficiency defined by ratio of 2-naphthol adsolubilized to total surfactant adsorbed amount was higher for SDS/C12E6 system than that for SDS/C10E6 system at the maximum adsolubilization. This difference in the efficiency between SDS/C10E6 and SDS/C12E6 systems is attributed to the properties of the mixed-surfactant adsorbed layer which are affected by the hydrocarbon chain lengths of nonionic surfactants.

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