将柔性链聚乙烯醇（PVA）分别与刚性链天然高分子海藻酸钠（SA）和壳聚糖（CS）共混,以增强其柔韧性及双极膜界面层的相容性。然后分别以纳米无机半导体材料和戊二醛为交联剂,对PVA/SA和PVA/CS进行改性,制备了PVA-mSA/mCS双极膜。测定了双极膜的J-V曲线、膜阻抗、接触角和溶胀度。以扫描电镜对PVA-ZnO-SA/mCS膜成分与形貌作表征,膜厚约121μm,中间界面层厚约5μm。电子能谱图表明氧化锌均匀分布在阳膜层中。实验结果表明,采用纳米ZnO改性后双极膜的亲水性增强,具有更强的中间界面层水解离能力,较小的工作电压和较低的膜阻抗,可以广泛应用于绿色化学和环境治理。
Polyvinylchloride(PVC)-mSA/mCS bipolar membrane(BPM) was prepared by the paste method.PVA/sodium alginate(SA) and PVA /chitosan(CS) were cross-linked by inorganic nano-materials and glutaraldehyde(GA),respectively.SEM photographs show that PVA-ZnO-SA/mCS BPM is consists of anion layer and cation layer,the thickness of the BPM is 121 μm,the interface of BPM is 5 μm.Electronic spectrum(EDS) indicates that ZnO well-distributed in cation layer.J-V curve and AC impedances of BPMs were investigated.It can be seen that PVA-ZnO-SA/mCS BPM shows lower working voltage,smaller membrane impedance,and ideal nano-ZnO modification effect.In addition,the dopping nano-ZnO improves the hydrophilic property and mechanical properties of the BPM.Therefore,PVA-ZnO-SA/mCS is an excellent BPM and can be widely used in the green chemistry and environmental management.
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