[20a-F102-1~12] 1.4 Energy conversion, storage, resources and environment

▲ [20a-F102-12] Kinetics and equilibrium studies for removal of silver from aqueous solutions by hybrid hydrogels

〇(D)Tran Thu Hong¹, Hirotaka Okabe¹, Yoshiki Hidaka¹, Kazuhiro Hara¹ (1.Kyushu Univ.)

Keywords:Hybrid hydrogel, Metal adsorption, Kinetics

Hybrid hydrogels with grafted and crosslinked polymeric networks were prepared by γ-radiation at atmosphere condition. The obtained hydrogels were soaked into 40ml of Ag⁺ of various concentrations (50-1000 ppb) in polypropylene tube. Samples were taken at different time intervals (0–48 hr.) and remaining metal concentrations were analyzed by ICP-MS. The optimal pH for Ag⁺ adsorption process was 5. The experimental equilibrium were tested for the Langmuir, Freundlich. Pseudo-first- and -second-order kinetic models were used for describing kinetic data. The kinetics of Ag⁺ removal of hybrid gels indicated rapid binding of metal ions to the adsorbents during 10 hrs., followed by a slow increase until equilibrium state was reached after 26 hrs. It was determined that removal of Ag⁺ was well fitted by second-order reaction kinetic.