Preparation and Application of CMC-PVA/CS-PVA bipolar membranes modified by PAN-FePc (COOH)8
首发时间:2015-04-14
Abstract:In this paper, the polyacrylonitrile (PAN)-iron octocarboxyphthalocyanine (FePc(COOH)8) nanofibers were prepared using electrospinning technique and introduced into the interlayer of a carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA)/chitosan (CS)-polyvinyl alcohol bipolar membrane (BPM), which was characterized using SEM, contact angle measurement, current-voltage characteristics, AC impedance spectroscopy and so on. The experimental results showed that after modification by PAN-FePc(COOH)8 nanofibers, the membrane impedance of the BPM and its cell voltage were decreased. That indicated that the water splitting efficiency in the interlayer of the BPM was increased. Then the prepared CMC-PVA/PAN-FePc(COOH)8/CS-PVA BPM was used in the electro-oxidized preparation of dialdehydle starch (DAS). The experimental results indicated that a current density of 20mAocm-2 was suitable to obtain high current efficiency. When the electrolysis time was 3h at a current density of 20 mAocm-2 , the current efficiency of the CMC-PVA/PAN-FePc(COOH)8/CS-PVA BPM-equipped cell was as high as 67%.
keywords: Electro-oxidized preparation Dialdehydle starch Bipolar membrane
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PAN-FePc(COOH)8改性CMC-PVA/CS-PVA双极膜的制备及其应用
摘要:在本文中,采用静电纺丝技术制备了聚丙烯腈(PAN)- 八羧基酞菁铁(FePc(COOH)8)纳米纤维,将其导入羧甲基纤维素(CMC) - 聚乙烯醇(PVA)/ 壳聚糖(CS)-PVA双极膜(BPM)的中间界面层,用SEM,接触角测量仪,电流 - 电压特性曲线,交流阻抗谱等对制备的双极膜进行了表征。实验结果表明,经PAN-FePc(COOH)8 纳米纤维改性后,双极膜的槽电压和膜阻抗都降低了,这表明,双极膜中间界面层的水解离效率得到了提高。然后将制备的 CMC-PVA/PAN-FePc(COOH)8/CS-PVA 双极膜应用于电-氧化制备双醛淀粉(DAS)。实验结果表明,在电流密度为20mAocm-2 时,可以获得较高的电流效率。且在该电流密度下,电解时间为3h时,以CMC-PVA/PAN-FePc(COOH)8/CS-PVA为隔膜的电解槽的电流效率 高达67%。
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No.4637992104963214****
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