再生纤维素基复合纳米纤维膜的制备及其应用

Preparation of Regenerated Cellulose-based Blend Nanofibrous Membrane and Its Application

采用静电纺丝技术和化学改性制备聚氨酯(PU)-偕胺肟聚丙烯腈(AOPAN)-再生纤维素(RC)复合纳米纤维膜,将其作为分离膜构建动态分离系统,并测定其对Fe^3+的动态吸附性能。结果表明,在液柱高度8 cm、膜层数5、Fe^3+的质量浓度5 mg/L的条件下,动态吸附率最高可达100%,溶液体积流量为4.60 m L/min;当Fe3+的质量浓度为300 mg/L时,动态吸附数据符合Thomas和Yoon-Nelson动态吸附模型,平衡吸附量分别为117.0 mg/g和113.3mg/g。通过对复合纳米纤维膜的扫描电镜、红外光谱及拉伸力学测试表征发现,加入PU后,其断裂强力和断裂伸长率均有所提升,同时具有良好的力学性能和稳定的微观形态。

Polyurethane/ammonium phthalocyanine/regenerated cellulose(PU-AOPAN-RC) composite nanofibrous membrane were prepared by electrospinning and chemical modification, then the dynamic separation system was constructed using prepared membrane as separation membranes, and their dynamic adsorption performance for Fe3+were measured. The results showed that the dynamic adsorption rate was up to 100% and the solution volume flow rate was 4.60 mL/min when liquid column height was 8 cm, membrane layer was 5 and Fe3+mass concentration was 5 mg/L. When the mass concentration of Fe3+was 300 mg/L, the dynamic adsorption data was consistent with the Thomas and Yoon-Nelson dynamic adsorption model, and the equilibrium adsorption amounts were 117.0 mg/g and 113.3 mg/g. By scanning electron microscopy, infrared spectroscopy and tensile mechanical testing of composite nanofibrous membrane, it was found that the strength and elongation at break were improved after adding PU, and it had good mechanical properties and stable microscopic morphology.