シラス火山灰から合成したホージャサイト型ゼオライトのカラム法による重金属イオン交換吸着特性

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 (第2報)

抄録

The dynamic adsorption characteristics of heavy metal ions such as Cd²⁺, Pb²⁺, Cu²⁺ and Zn²⁺ on granular zeolite which is prepared from the preheated mixture of Shirasu volcanic ash and Na2O have been investigated by column method.
The column of granular zeolite used for adsorptionof heavy metal ions is 17.5 cm long and 0.5 cm in diameter. When feed solution containing 47.8 ppm of Cd²⁺was made to flow the columnof zeolite having faujasite contents of 62.9% to 91.0%, th e volume of effluent containing less than 0.01 ppm of Cd²⁺ (breakthrough capacity) was about 2600 times of bed volume.
The breakthrough capacity was not affected by changing the space velocity of feed solution in the range of 15 to 45.
The column saturated with Cd²⁺ was regenerated by washing with NaCl solution of 1.0 mol/l, but the ratio of regeneration was about 80% of adsorption capacity in virgin zeolite.
The zeolite column regenerated with NaCl solution found to be satisfactory used for adsorption of heavy metal ion again and again.