吸附重金属离子的核壳纤维的制备与研究

Preparation and research of core shell fiber adsorbing heavy metal ions

为了制备低成本、强吸附、高效、环境友好的新型吸附剂,首先以不同比例的聚甲基丙烯酸和醋酸纤维素混合溶液作为纺丝液,采用单轴静电纺丝制备出纳米纤维。通过透射电镜,红外光谱和X射线光电能谱证明纤维具有明显的核壳结构。同时表征了纤维的热稳定性和力学性质。然后研究了pH值、初始离子浓度、吸附时间和醋酸纤维素含量对纤维吸附二价铜离子性能的影响。最后,通过对纤维进行吸附和解吸测试,研究了影响纤维重复利用性的因素。结果表明,具有核壳结构的纳米纤维可以有效的吸附二价铜离子,并通过反复的吸附和解吸实现材料的循环利用。

In order to prepare new adsorbent with low cost,strong adsorption,high efficiency and environmental friendliness,the nanofibers were prepared by uniaxial electrospinning with the mixed solution of polymethacrylic acid and cellulose acetate as the spinning solution.TEM,FT-IR and XPS showed that the fibers had obvious core-shell structure.The thermal stability and mechanical properties of the fibers were also characterized.Then,the effects of pH,initial ion concentration,adsorption time and cellulose acetate content on the adsorption of two valence cupric ion on fiber were studied.Finally,the factors affecting fiber reutilization were studied by adsorption and desorption tests.The results show that nanofibers with core-shell structure could effectively adsorb two valence cupric ions,and achieve recycling of materials through repeated adsorption and desorption.