抽出剤内包型アルギネートマイクロカプセルへの銅の吸着特性

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The adsorption behavior of Cu^<2+> ions on microcapsules encapsulating Cyanex 302 extractant (Bis (2,4,4,-trimethypentyl) monothiophosphinic acid, HA) has been studied by batch and column methods. The oil drops of Cyanex 302 were uniformly encapsulated in the matrices of alginate gel polymers such as CaALG, SrALG and BaALG. The microcapsules exhibited a relatively large uptake percentage above 95.6% for Cu^<2+> ions even in the presence of 1 M HNO_3. The uptake of Cu^<2+> ions on microcapsules attained equilibrium within 10 h, and the uptake rate increased with HA content enclosed in the microcapsule. The order of uptake rate of Cu^<2+> ions on different microcapsules was HA-CaALG > HA-SrALG > HA-BaALG > HA-HALG >> CaALG. The uptake of Cu^<2+> ions followed a Langmuir adsorption isotherm and the maximum amount of uptake was estimated to be 0.37 mmol/g. The packed column with microcapsule particles was effective for the selective uptake and recovery of Cu^<2+> ions. (Received October 15, 2002)uptakecoppermicrocapsuleencapsulationCyanex 302extractantalginategel polymeruptake percentageuptake rateLangmuir adsorption isothermpacked column
東北大学の論文
2003-03-03