Microcapsule for adsorption and recovery of cadmium(II) ion

Abstract

A chelate resin that adsorbed bathocuproinedisulfonate ion on an anion exchange resin was synthesized, and then polystyrene microcapsules containing the chelate resin were prepared by interfacial polymerization with W/O/W emulsions. The adsorption behavior of metallic ions such as Cu ²⁺, Cd ²⁺, Co ²⁺, Ni ²⁺, and Zn ²⁺ ions into the microcapsules obtained then was examined at 25°C. The adsorption rate of the Cd ²⁺ ion to the microcapsules was over 9 times more than that of the Cu ²⁺, Co ²⁺, Ni ²⁺, and Zn ²⁺ ions. None of the metallic complexes trapped in the microcapsules were affected by the outside environment such as pH, and the Cd ²⁺ ion remained unaffected in the microcapsules even in a highly acidic solution.

Keywords:

• Cadmium ion
• Microcapsule
• Chelate resin
• Adsorbent
• Bathocuproinedisulfonic acid disodium salt

Acknowledgments