高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

mCMC-PEG-CS双极膜在电还原制备巯基乙酸中的应用

陈妮娜1,2, 陈日耀1, 郑曦1, 陈晓1, 陈震1   

    1. 福建师范大学化学与材料学院, 福州 350007;
    2. 漳州城市职业学院, 漳州 363000
  • 收稿日期:2007-06-05 修回日期:1900-01-01 出版日期:2008-03-10 发布日期:2008-03-10
  • 通讯作者: 陈震

Electro-generation of Thioglycolic Acid Using mCMC-PEG-CS Bipolar Membrane as Separator in Electrolysis Cell

CHEN Ni-Na1,2, CHEN Ri-Yao1, ZHENG Xi1, CHEN Xiao1, CHEN Zhen1*   

    1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China;
    2. Zhangzhou City University, Zhangzhou 363000, China
  • Received:2007-06-05 Revised:1900-01-01 Online:2008-03-10 Published:2008-03-10
  • Contact: CHEN Zhen

PDF (PC)

被引次数

39

摘要： 以Fe3+改性羧甲基纤维素(CMC)和聚乙二醇(PEG)共混物为阳膜, 以戊二醛改性壳聚糖(CS)和聚乙二醇共混物为阴膜, 制备了mCMC-PEG-CS双极膜, 并将其用作电解还原制备巯基乙酸(TGA)电解槽中阴阳两室间的隔膜. 以硫代硫酸钠法合成的巯基乙酸(TGA)和二硫代二乙酸(DTDGA)混合物为原料, 研究了酸浓度、温度及电解电流密度对电还原DTDGA制备TGA的生成量和电流效率的影响. 实验结果表明, 在TGA初始合成质量分数为2.79%, 电流密度为10 mA/cm2, 35 ℃电解时, 阴极室电还原产物巯基乙酸的电流效率为74.69%, 电解过程中的平均电流效率为54.02%. 与传统的金属还原法还原DTDGA制备的TGA相比, 不仅避免了昂贵的金属还原剂锌的消耗, 而且消除了反应副产物锌泥对环境的污染.

关键词: mCMC-PEG-CS双极膜, 巯基乙酸(TGA), 电还原, 二硫代二乙酸(DTDGA)

Abstract: mCMC-PEG-CS bipolar membrane(BM) was prepared by cation and anion exchange membrane. Cation exchange membrane was prepared with polyethylene glycol(PEG)-sodium carboxymethyl cellubse(CMC) blends which were modified by Fe3+, and anion exchange membrane was prepared by PEG-chitosan(CS) blends which were modified by glutaraldehyde(GA), rspectively. mCMC-PEG-CS bipolar membrane was used as a separator in the electrolysis cell to produce thioglycolic acid(TGA). Thioglycolic acid(TGA) was prepared by electro-reduction of dithioglycollic acid(DTDGA) with the mixture of TGA and DTDGA as the raw materials. The influences such as acid concentration, temperature and electrolysis current densities on the electro-generation and the current efficiency of TGA were studied. The experiment results show that TGA was prepared effectively by electroreduction of dithioglycollic acid(DTDGA) with the mixture of TGA(2.79%) and DTDGA in the cathodic room. The current efficiency was up to 74.69% at 35 ℃ in a cylinder electrolysis cell at 10 mA/cm2. To compare with the traditional of metal reduction method, the electro-reduction technology saves the zinc powder and eliminates the pollution to environment.

Key words: mCMC-PEG-CS Bipolar membrane, Thioglycolic acid(TGA), Electro-reduction, Dithioglycollic acid(DTDGA)

中图分类号: 

TrendMD: