Ni-P-mCMC/mCS双极膜技术在成对电解制备糠醇、糠酸中的应用  

Electrolysis-generation of Furfural Alcohol and Furoic Acid in Pair by Ni-P-mCMC/mCS Bipolar Membrane

作　　者：郭贞贞[1] 陈震[1,2] 郑曦[1] 陈晓[1] 陈日耀[1] 

机构地区：[1]福建师范大学化学与材料学院,福州350007 [2]宁德学院化学系,宁德352100

出　　处：《应用化学》2010年第5期579-584,共6页Chinese Journal of Applied Chemistry

基　　金：福建省自然科学基金(D0710009);福建省发展与改革委员会(2008-762)资助项目

摘　　要：以磷酸化试剂改性羧甲基纤维素钠(mCMC)制备了阳膜层,以戊二醛改性壳聚糖(mCS)制备了阴膜层溶胶,将阴膜层溶胶流延于阳膜层上,制备了P-mCMC/mCS双极膜,而后以化学镀方法在阳膜层表面镀镍,制备了Ni-P-mCMC/mCS双极膜,并应用于成对电合成糠醇(阴极室中)、糠酸(阳极室中)。在电场的作用下,双极膜中水电离后生成的H+透过mCMC阳离子膜进入阴极室,促进糠醛电还原生成糠醇过程的进行;OH-透过mCS阴离子膜进入阳极室,与糠醛电氧化生成糠酸过程中产生的H+结合生成H2O,以增大正向反应的速度。在电流密度为2.5×10-2A/cm2,30℃下电解,阴阳两极室的电解效率分别为83.0%和77.4%,电解槽电压稳定在3.0V左右。Ni-P-mCMC/mCS bipolar membrane（BPM） was prepared from carboxymethyl cellulose（CMC） modified with phosphorylated agent as a cation exchange layer and chitosan（CS） modified with glutaraldehyde（GA） as an anion exchange layer.The electrolysis cell was constituted by Ni-P-mCMC/mCS BPM as a septum for electro-generating furfural alcohol（in the cathode room） and furoic acid（in the anode room）.The experiment results show that H＋ generated by the BPM moves into the cathode room from the interface layer of the Ni-P-mCMC/mCS BPM to promote the electro-reduction of furfural for generating furfuryl alcohol;OH-moves into the anode room to combine with H＋ produced by electro-oxygenation of furfural to generate furoic acid and improve the forward reaction speed.The electrolysis efficiency was up to 82.4% in the cathode room and 77.4% in the anode room at 30 ℃ when the current density was 2.5×10-2 A/cm2.

关 键 词：双极膜 糠醇 化学镀镍 电合成 糠酸 

分 类 号：O646[理学—物理化学]