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分别用Fe3+和戊二醛作为交联剂对羧甲基纤维素钠(CMC)-聚乙烯醇(PVA)阳膜层和壳聚糖(CS)-聚乙烯醇阴膜层进行改性,在中间界面层引入以静电纺丝技术制备的聚丙烯腈(PAN)-四磺酸基铜酞菁(CuTsPc)纳米纤维纺丝,制备了CMC-PVA/PAN-CuTsPc/CS-PVA双极膜(BPM).并用扫描电镜、接触角测定仪,电流密度-槽电压关系曲线、交流阻抗谱等对制备的双极膜进行了表征.结果表明,CMC-PVA阳膜用PAN-CuTsPc纳米纤维纺丝改性后,表面亲水性增强,中间界面层水解离效率提高,致使双极膜的膜阻抗和IR降显著降低.CMC-PVA/PAN-CuTsPc/CS-PVA(w(CuTsPc):3.0%)双极膜在90 mA·cm-2电流密度时的电阻压降(即膜IR降)仅为0.9 V.
The CMC - PVA positive layer and the chitosan (CS) - PVA negative layer were modified by using Fe3 + and glutaraldehyde as crosslinking agents, respectively. The interfacial layer was spin-coated with PANT-CuTsPc nanofibers prepared by electrospinning to prepare CMC-PVA / PAN-CuTsPc / CS-PVA bipolar membrane BPM) .The prepared bipolar membrane was characterized by scanning electron microscopy, contact angle measurement, current density-tank voltage curve and AC impedance spectroscopy.The results showed that CMC-PVA positive membrane was spin-coated with PAN-CuTsPc nanofibers After modification, the hydrophilicity of the surface increased, and the hydrolysis efficiency of the interfacial layer increased, resulting in a significant decrease of the membrane impedance and IR drop of the bipolar membrane.CMC-PVA / PAN-CuTsPc / CS-PVA (wT CuTsPc) ) Bipolar film at 90 mA · cm-2 current density resistance drop (ie, film IR drop) is only 0.9V.