【作者】 董燕青；

【导师】 陈震；

【作者基本信息】 福建师范大学 ， 物理化学， 2008， 硕士

【摘要】 分别用戊二醛和二价锡离子改性壳聚糖（CS）和海藻酸钠（SA）,制备m（SA-CS）BPM。用扫描电镜作膜形貌观察,IR分析表明该聚合物膜两边分别含有-NRH₂⁺、-COO^-官能团。该膜溶胀率较小,并能稳定存在于酸碱溶液中。以制备出的m（SA-CS）BPM作为双阳极室圆筒电解槽的隔膜,应用于电合成乙醛酸体系。在电场的作用下,双极膜中的水离解产生H⁺和OH^-,生成的H⁺及时传输入阴极室中补充电生成乙醛酸时H⁺的消耗。电流密度38.4 mA/cm²,电解14 h,产率92.5%,平均电流效率82.6%,电解槽工作电压仅2.3 V。将m（SA-CS）BPM作为双阴阳极电解槽的隔膜,应用于双成对电合成乙醛酸体系。在电场的作用下双极膜中水电离后生成的H⁺透过mSA阳离子膜进入阴极室,以补充草酸电还原生成乙醛酸过程中H⁺的消耗;OH^-透过mCS阴离子膜进入阳极室,与乙二醛电氧化生成乙醛酸过程中产生的H⁺结合生成H₂O,促进反应向正方向进行,从而增大了在电流密度为30 mA/cm²,20℃下电解,双阴极室的电流效率分别可达86.94%和82.81%,双阳极室的电流效率可达81.99%和78.62%,电解电压稳定在3.0V左右。更多还原

【Abstract】 Modified m（SA-CS）bipolar membrane was prepared after chitosan（CS）and alginate（SA）were modified by glutaraldehyde and ferric chloride as linking reagents, respectively.The sectional structure of m（SA-CS）bipolar membrane were studied by SEM.IR spectrum indicated that the bipolar membrane contains -NRH₂⁺ and-COO^-functional groups in CS membrane and SA membrane respectively,m（SA-CS）bipolar membrane was quite stable in acid and alkali solution.The cylinder electrolytic cell was constituted by double anode,using m（SA-CS） bipolar membrane as septum in electrolysis cell for electro-generating glyoxylic acid. Under the function of electric field,water was dissociated to produce H⁺ and OH^- in the bipolar membrane.H⁺ transmit into the cathode chamber to supply the consuming of H⁺ in the process of electro-generating glyoxylic acid.When the current density was 38.4 mA/cm²,the yield was 92.5%,and the current efficiency reached to 97.3%,The electrolysis voltage was as low as 2.3 V.Using m（SA-CS）BPM as septum in electrolysis cell for electro-generating glyoxylic acid.The experiment results show that H⁺ generated by BPM moves into cathode chamber in time through mSA to supplement H⁺ consumed by electro-reduction of oxalic acid to generate glyoxylic acid;OH^- moves into anode chamber in time through mCS to combine with H⁺ produced by electro-oxygenation of glyoxal to generate glyoxylic acid and improves the reaction go along.The current efficiency was up to 87.53%,84.4%and 80.97%,76.15%,respectively at 20℃during the current density was 30 mA/cm².更多还原