活性炭に対する界面活性剤の吸着に関する研究 (第2報) : 非イオン界面活性剤の吸着における共存塩類の影響

概要

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The effect of coexisting salts for adsorption of nonionic surfactants on activated carbon in aqueous solution was investigated. Inorganic salts which reduced the cloud point of polyoxyethylene nonylphenyl ether (NP-10) increased the adsorption of NP-10 on activated carbon, while inorganic salts which raised the cloud point disturbed the adsorption. In the case of organic salts, the adsorption of NP-10 on activated carbon was disturbed because of the competing adsorption between NP-10 and organic salts. The amount of adsorption of NP-10 decreased with increasing the hydrophobicity of organic salts. Sodium sulfate, sodium perchlorate and sodium citrate aggregated NP-10 molecules. The aggregation was influenced by temperature. The amount of adsorption of NP-14 on activated carbon was unaffected by the changes of pH in the range of 2 to 12.