Citation: CHEN Ri-Yao, CHEN Zhen, ZHENG Xi, CHEN Xiao, HUANG Cai-Xia. Preparation and Characterization of CoPc(COOH)8-SA/mCS Bipolar Membranes[J]. Acta Physico-Chimica Sinica, 2009, 25(12): 2438-2444. doi: 10.3866/PKU.WHXB20091110
CoPc(COOH)8-SA/mCS双极膜的制备及表征
分别用Fe3+离子和戊二醛作为交联剂对海藻酸钠(SA)阳膜层和壳聚糖(CS)阴膜层进行改性, 制备了八羧基钴酞菁-海藻酸钠/改性壳聚糖(CoPc(COOH)8-SA/mCS)双极膜(BPM). 在海藻酸钠阳膜层中添加八羧基钴酞菁以提高阳膜的离子交换容量, 促进中间层水的解离. 用傅立叶红外(FT-IR)光谱、扫描电镜(SEM)等方法对制备的双极膜进行了表征. 实验结果表明, 经八羧基钴酞菁改性后, 阳离子交换膜层的离子交换容量、H+离子透过率均获得提高. 与Fe3+离子改性或二茂铁离子改性的mSA/mCS双极膜相比, CoPc(COOH)8-SA/mCS双极膜的交流阻抗、电阻压降(IR降)和溶胀度降低. 当电流密度高达105 mA·cm-2时, CoPc(COOH)8-SA/mCS双极膜的IR降仅为0.7 V.
English
Preparation and Characterization of CoPc(COOH)8-SA/mCS Bipolar Membranes
A sodiumalginate (SA) cation layer was modified by cobalt octocarboxyphthalocyanine (CoPc(COOH)8) to improve its ion exchange capacity and to promote water splitting at the interlayer. The CoPc(COOH)8-SAand chitosan (CS) were then modified using Fe3+ and glutaraldehyde as linking reagents to prepare CoPc(COOH)8-SA/mCS bipolar membranes (BPMs). FT-IR spectra and SEM were used to characterize CoPc(COOH)8-SA/mCS BPMs. Experimental results showed that the ion exchange capacity and hydrogen ion transmigration rate of the CoPc(COOH)8-SA cation exchange membrane had increased. By comparison to the mSA/mCS BPMthat was modified by Fe3+ or ferrocene, the AC impedance, IR drop and the swelling degree of the CoPc(COOH)8-SA/mCS BPMs all decreased. The IR drop of the CoPc(COOH)8-SA/mCS BPMwas only 0.7 Vat a higher current density of 105 mA·cm-2.
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Key words:
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Bipolar membrane
- / Cobalt octocarboxyphthalocyanine
- / Sodiumalginate
- / Chitosan
- / Interlayer
- / Water splitting
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