PVA-SA/CS双极膜制备及在电解制备羟基新戊酸中的应用  

Preparation of PVA-CS/SA Bipolar Membrane and Its Application in Electro-generation of Hydroxypivalic Acid

作　　者：许彩霞[1] 陈日耀[1] 郑曦[1] 吴春山[1] 陈震[1] 

机构地区：[1]福建师范大学化学与材料学院,福州350007

出　　处：《应用化学》2008年第3期317-321,共5页Chinese Journal of Applied Chemistry

基　　金：福建省教育厅资助项目(JB06069;JB05314)

摘　　要：将柔性链聚乙烯醇（PVA）分别与天然高分子海藻酸钠（SA）、壳聚糖（CS）共混，以增强其柔韧性及双极膜界面层的相容性。分别以FeCl3和戊二醛为交联剂，对PVA／SA和PVA／CS进行改性，制备了PVA-SA／CS双极膜，其溶胀度为25％，80％。用红外光谱和扫描电子显微镜对膜成分与形貌进行了表征。结果表明，PVA-SA／CS双极膜致密，表面均匀，未见孔隙。阴离子交换层（GA-PVA／CS）中含有-N=C官能团，阳离子交换层（Fe-PVA／SA）中含有-COO^-官能团。以PVA-SA／CS双极膜为电解槽的隔膜，间接电氧化羟基新戊醛为羟基新戊酸，槽电压稳定，在电流密度28×10^-3 A／cm^2下，最大电流效率为68．9％，平均电流效率为52．2％。PVA-SA/CS bipolar membrane was prepared by the paste method. PVA/sodium alginate（SA） and PVA/chitosan（CS） were cross-linked by Fe^3＋ and glutaraldehyde（GA）, respectively. The swelling level of PVA/SA/CS bipolar membranes was in a range of 25% - 80%. The morphology was investigated by SEM and the functional groups were studied by IR. PVA-SA/CS bipolar membrane exhibts a dense surface without pores. The anion layer（GA-PVA/CS） contains -N=C functional groups, while the cation layer（ Fe-PVA/ SA） contains -COO^- functional groups. PVA-SA/CS bipolar membranes were used as the separator in the electrolysis cell for the electro-generation of hydroxypivalic acid. The cell voltage was quite stable. The average current efficiency was 52. 2%, and the highest current efficiency reached to 68.9% at a current density of 28×10^-3 A/cm2.

关 键 词：双极膜 羟基新戊酸 电氧化 海藻酸钠 壳聚糖 聚乙烯醇 

分 类 号：O636[理学—高分子化学]