Ni-mSA-mCS双极膜的制备及其在电合成TGA中的应用

通过用Ca2+改性海藻酸钠(SA)和用戊二醛改性壳聚糖(CS)制备Ni-mSA-mCS(m: modified)双极膜. 镍网预先埋在mSA膜表面作为阴极, 不仅增强了膜的机械性能, 而且降低阴极电解液的IR降, 实现零极距. 测定了膜的红外光谱、电镜扫描、机械性能. 将Ni-mSA-mCS双极膜应用于电还原制备巯基乙酸(TGA). 实验结果表明, 电流密度为10 mA·cm-2, 常温电解, 电流效率可达66.7%. 与传统的Zn还原法相比, 不仅省去了昂贵的金属还原剂的消耗, 而且消除了锌泥对环境的污染.

Preparation of Ni-mSA-mCS Bipolar Membrane and Its Application in Electro-generation of TGA

Sodium alginate (SA) and chitosan (CS) were modified by Ca2+ and glutaraldehyde (GA) as linking reagents respectively to prepare Ni-mSA-mCS (m: modified) bipolar membrane (BM). The nickel net was settled down to the surface of the mSA cation membrane as a cathode. It improved the mechanical property of membranes and realized zero polar distance, minimized the IR drop in the cathode electrolyte. It was characterized by FTIR and SEM, and used as a separator in the electrolysis cell to produce thioglycolic acid (TGA). The experiment results showed that TGA was prepared effectively by electro-reduction of dithiodidiglycolic acid (DTDGA). The current efficiency was up to 66.7 % method, the electro-reduction technology saves the zinc powder and eliminates the pollution to environment.