Adsorption Characteristics of Heavy Metal Ions on Synthetic Zeolite from Shirasu Volcanic Ash

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  • シラス火山灰から合成したゼオライトの重金属吸着特性
  • シラス カザンバイ カラ ゴウセイシタ ゼオライト ノ ジュウキンゾク キュウ

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The adsorption characteristics of heavy metal ions on the svnthetic zeolite which is reared from the preheated mixture of Shirasu volcanic ash and Na2O have been investiated by a batch method.<BR>From effects of pH on adsorption of Pb2+, Cd2+, Cu2+ and Zn2+ ions, it is found that the snthetic zeolite efficientiy adsorbs metal ions in solution above pH 5, but the adsorptive ability of the synthetic zeolite is sharply reduced in acidic solution below pH 4 because of the decomposition and dispersion of the synthetic zeolite.<BR>Adsorption capacities of the synthetic zeolite (faujasite) are 5.05 meq/g for Pb2+, 3.70 me/g for Cd2+, 3.56 meq/g for cu2+ and 2.69 meq/g for Zn2+. These values are about ten times those of natural zeolite (mordenite).<BR>The order of selectivity for adsorption of metal ions on the Synthetic zeolite is Pb2+>>Cd2+>Cu2+>Zn2+.<BR>The adsorption isotherm of metal ions on the synthetic zeolite follows Langmuir's equation in the range of equilibrium Concentration from 8.0×10-5 to 1.5×10-2 mol/l at 25°C.<BR>Adsorbed Cd2+ ion on synthetic zeolite can be eluted effectively by the treatment with NaCl solution above 0.17 mol/l.

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