Ni-mSA-mCS双极膜的制备及其在电合成TGA中的应用(英文)  

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

作　　者：黄振霞[1] 陈日耀[1] 郑曦[1] 陈晓[1] 陈震[1] 

机构地区：[1]福建师范大学化学与材料学院实验中心,福州350007

出　　处：《物理化学学报》2007年第11期1771-1775,共5页Acta Physico-Chimica Sinica

基　　金：福建教育局(JB06069,JB05314)资助项目

摘　　要：通过用Ca^(2+)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.Sodium alginate （SA） and chitosan （CS） were modified by Ca^2＋ 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% at room temperature （25 ℃） under the current density of 10 mA. cm^-2. Compared with the traditional metal reduction method, the electro-reduction technology saves the zinc powder and eliminates the pollution to environment.

关 键 词：电合成 巯基乙酸 二硫代二乙酸 Ni-mSA-mCS双极膜 

分 类 号：O621.2[理学—有机化学]