HPAMAM@PLA 复合纤维膜对水溶液中 $ Cu^{2+} $ 的吸附

文章通过静电纺丝技术制备聚乳酸(PLA)电纺纤维膜, 再利用浸泡-交联方法将合成的超支化聚酰胺-胺(HPAMAM)与PLA电纺纤维膜结合制备HPAMAM@PLA复合纤维膜, 并对HPAMAM@PLA复合纤维膜的结构和对水溶液中 $ Cu^{2+} $的吸附过程进行研究。吸附结果表明: 复合纤维膜可有效去除水溶液中的 $ Cu^{2+} $; 复合纤维膜的最佳吸附pH值为6; 其吸附过程符合准二级动力学模型, 等温吸附模型符合Langmuir等温吸附模型, 随着温度和水溶液中初始 $ Cu^{2+} $质量浓度增加膜的吸附量也随之增加, 理论最大饱和吸附量可达到70.57mg/g。

Polylactic acid (PLA) electrospinning fiber membrane was prepared via electrospinning, and then the hyperbranched poly(amido-amine)(HPAMAM) was used to modify PLA electrospinning fiber membrane by soaking and cross-linking to prepare HPAMAM@PLA composite fiber membrane. The structure of HPAMAM@PLA composite fiber membrane and the adsorption process of $ Cu^{2+} $ in aqueous solution were studied. The results show that the composite fiber membrane can effectively remove $ Cu^{2+} $ in aqueous solution. The suitable pH value for $ Cu^{2+} $ adsorption is 6. The adsorption process is in accordance with the pseudo-second-order kinetic model. The isothermal adsorption experiments indicate that Langmuir isothermal adsorption model is more suitable in describing the adsorption behavior. With the increase of temperature and initial $ Cu^{2+} $ concentration in aqueous solution, the adsorption capacity of the composite fiber membrane also increases. The theoretical maximum saturated adsorption capacity can reach 70.57 mg/g.