Adsorption of Au(III)on chloromethylthiirane crosslinked chitosan resin in chlorating system
Chloromethylthiirane was used as crosslinking agent to synthesize chloromethylthiirane crosslinked chitosan (CCCS) resin,which was characterized with SEM and FTIR.The adsorption kinetics and adsorption equilibrium of Au(Ⅲ)on CCCS resin were also studied.The results showed that chloromethylthiirane had a ring-opening reaction during the crosslinking process in which sulfhydryl was formed, —NH2 and —HS of CCCS had a share in coordination with Au(Ⅲ)in the adsorption, the adsorption rate followed the second-order kinetics model of Legergren,and the apparent energy of activation was 16.039 kJ·mol-1. The isothermal adsorption followed the isothermal adsorption equations of Freundlich and Langmuir.The adsorption process was a exothermic physical adsorption.