Adsorption of CO2+ by stylene-g-polyethylene membrane bearing sulfonic acid groups modified by radiation-induced graft copolymerization

Cation-exchange hollow fiber membrane was prepared by radiation-induced grafting polymerization of styrene onto polyethylene hollow fiber membrane and its sulfonation. Adsorption characteristics for the cation-exchange membranes are examined when the solution of Co2+ permeates across the cation-exchange fiber membrane. The maximum grafting peak was obtained from 70% styrene concentration at 50°C. The degree of grafting (%) was enhanced with additives such as H2SO4 and divinylbenzene. The content of SO3H groups ranged from 2 to 5 mmol g−1 with chlorosulfonic acid (ClSO3H) in dichloroethane, from 0.5 to 6 mmol g−1 with ClSO3H in H2SO4, respectively. The adsorption of Co2+ by the cation-exchange membranes increased with increasing SO3H content.