Modification of PTFE Fiber and Its Adsorption Property for Bilirubin

The adsorbent of bilirubin based on polytetrafluoroethylene(PTFE) fiber was prepared by 60Co radiation-induced graft polymerization with GMA and by subsequent chemical modification of the epoxy group of PTFE-g-GMA fiber with PEI.The highest amino content on the PTFE-g-GMA-PEI fiber is 1.87 mmol /g.The effect of pH,ionic strength,temperature,BSA,initial bilirubin concentration and adsorption dynamics on the adsorption capacity of PTFE-g-GMA-PEI fiber for bilirubin were investigated in a batch system.Experimental data indicate that the adsorption capacity of the grafted fiber is greatly affected by the pH of the medium,and in near neutral solution of pH=6.5,the grafted fiber have the highest adsorption capacity(9.6 mg/g).The bilirubin adsorption on the PTFE-g-GMA-PEI fiber obeyed the Langmuir model.Besides,the PTFE-g-GMA-PEI fiber has the considerablely competitive ability to combine bilirubin with BSA.