四磺酸基铜酞菁-海藻酸钠/壳聚糖双极膜的制备与表征

Preparation and Characterization of CuTsPc-SA/mCS Bipolar Membrane

分别用Fe3+和戊二醛作为交联剂对海藻酸钠(SA)阳离子交换膜和壳聚糖(CS)阴离子交换膜进行改性,制备了四磺酸基铜酞菁(CuTsPc)-海藻酸钠/改性壳聚糖双极膜(CuTsPc-SA/mCSBPM).在海藻酸钠阳膜层中添加四磺酸基铜酞菁,以提高阳膜层的离子交换容量,促进双极膜中间层中水的解离.采用X射线光电子能谱(XPS)对CuTsPc-SA阳离子交换膜进行了表征.实验结果表明,改性后SA阳膜层的离子交换容量、H+透过率均获得提高.与Fe3+改性或二茂铁离子改性的mSA/mCS双极膜相比,CuTsPc-SA/mCS双极膜的阻抗及电阻压降(即膜IR降)均下降.当电流密度为120mA/cm2时槽电压仅为5.6V.当CuTsPc含量为2.5%(质量分数)时CuTsPc-SA/mCS双极膜在H+离子浓度小于8mol/L的酸溶液中具有稳定的工作性能.

Sodium alginate （SA） and chitosan （CS） were modified by Fe^3＋ and glutaraldehyde as linking reagents to prepare CuTsPc-SA/mCS bipolar membrane （BPM）. The copper phthalocyanine tetrasulfonic acid （CuTsPc） was added into the SA cation exchange layer to improve the ion exchange capacity and promote water splitting at the interlayer of the CuTsPc-SA/mCS BPM. X-ray photoelectron energy spectrum （XPS） was used to characterize the CuTsPc-SA cation exchange membrane. The experimental results indicated that the ion exchange capacity and hydrogen ion transmigration rate of the CuTsPc-SA cation exchange membrane were increased. In comparison with the mSA/mCS BPM modified by Fe3＋ or ferrocene, the membrane impedance and IR drop of the CuTsPc-SA/mCS BPM were decreased. The cell voltage was only 5.6 V at a higher current density of 120 mA·cm^―2. When the concentration of CuTsPc was 2.5%, the CuTsPc-SA/mCS BPM was stable in an acid solution （[H^＋]8 mol/L）.