mCS-GA聚合物电解质膜的制备及电生成巯基乙酸的应用

Preparation of mCS-GA Polyelectrolyte Membrane and Its Application to Electro-generation of TGA

摘要:

以戊二醛为交联剂，甘油为增塑剂，制备了壳聚糖(CS)-阿拉伯树胶(GA)改性聚合物电解质(mCS-GA)膜，单因素分析各组分对mCS-GA聚合物电解质膜抗水性能、机械性能等影响以确定膜的较佳配方。以FTIR测定膜的红外光谱，以扫描电镜观察膜表面和界面层的形态，以XRD分析膜组分的相容性，结果表明该聚合物薄膜各组分相容性好，含有 —COOH, —NH3＋官能团具有两性离子的特征，该膜能稳定存在于酸碱溶液中。膜特性研究表明mCS-GA聚合物电解质膜具有离子交换和选择性渗透能力，将其用作为电解还原制备巯基乙酸(TGA)电解槽中阴阳两室间的隔膜。实验结果表明，以巯基乙酸和二硫代二乙酸的混合液为阴极液，25%H2SO4作为阳极电解液，电流密度10mA/cm2，阴极室电还原产物巯基乙酸的电流效率达71.77%。

Abstract:

The polyelectrolyte membrane was prepared by interaction between chitosan (CS) and acacia(GA) using glutaraldehyde as linkage reagent, glycerol as plasticizer. The property such as water resistance and tensile strength were studied using single factor analysis. The optimal formula for determining the composite film to determine the better formula of the membrane. FTIR was applied to analysis the function groups of the bipolar membrane. SEM was used to observe its surface structure. XRD was used to analysis the compatibility of membrane components.The results showed that the polymer film has good compatibility, and contains - COOH, - NH3 functional groups with the characteristics of the gender, the film can be stable in acid and alkali solution. The structure and properties were studied and the membrane was a separator in the electrolysis cell to produce thioglycolic acid (TGA). The experimental results showed that thioglycolic acid was prepared effectively by electro-reduction of dithioglycollic acid blended with thioglycolic acid in the cathode room and 25% H2SO4 as the anode electrolyte1.The current efficiency was up to 71.77% at room temperature when current density was 10 mA/cm2