聚四氟乙烯纤维的改性及其对胆红素的吸附

Modification of PTFE Fiber and Its Adsorption Property for Bilirubin

以聚四氟乙烯(PTFE)纤维为基质,以甲基丙烯酸缩水甘油酯(GMA)为单体,通过辐照接枝聚合制备了PTFE-g-GMA纤维,用聚乙烯亚胺(PEI)与PTFE-g-GMA纤维进行开环反应制得新型吸附剂PTFE-g-GMA-PEI.考察了PTFE-g-GMA-PEI吸附剂对溶液中胆红素的吸附动力学、吸附量及pH、离子强度及温度等因素对胆红素吸附的影响.实验结果表明,该吸附剂对胆红素有较高的吸附容量及良好的选择吸附性能,其吸附行为遵循Langmu ir吸附模式.

The adsorbent of bilirubin based on radiation-induced graft polymerization with GMA polytetrafluoroethylene （PTFE） fiber was prepared by ^60Co 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. Experi- mental data indicate that the adsorption capacity of the urn, and in near neutral solution of pH = 6.5, the grafted fiber is greatly affected by the pH of the medi- 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.