mSA-CS双极膜在电还原制备巯基乙酸中的应用  

Electro-Generation of Thioglycolic Acid by mSA-CS Bipolar Membrane

作　　者：黄振霞[1] 黄雪红[1] 陈日耀[1] 郑曦[1] 陈震[1] 

机构地区：[1]福建师范大学化学与材料学院,福州350007

出　　处：《化学学报》2007年第21期2466-2472,共7页Acta Chimica Sinica

基　　金：福建省教育厅(Nos.JB06069;JB05314)资助项目.

摘　　要：用Ca2+改性海藻酸钠(SA),用戊二醛(GA)改性壳聚糖(CS),制备mSA-CS聚合物双极膜.测定膜的红外光谱及机械性能,并作膜的热重分析.以扫描电镜观察膜表面和界面层形态.测定了mCS膜制备溶液的粘度以及mSA,mCS膜的含水率、离子交换容量及酸碱浓度对膜溶胀度的影响.将mSA-CS双极膜应用于电解还原制备巯基乙酸(TGA).实验结果表明,以硫代硫酸钠法合成的TGA和二硫代二乙酸(DTDGA)的混合液作阴极液,TGA初始合成质量分数为4.61%,电流密度为10mA·cm-2下常温电解,产物巯基乙酸的电流效率达66.7%.与传统的金属还原法还原DTDGA成TGA相比,不仅省去了昂贵的金属还原剂的消耗,而且消除了对环境的污染.mSA-CS bipolar membrane was prepared by sodium alginate （SA） and chitosan （CS）, which were modified by Ca^2＋ and glutaraldehyde （GA） as linking reagents, respectively. The viscosity of the mCS precursor solution, moisture content, and ion exchange capacity of roSA, mCS, as well as the influence of an acid-base concentration were investigated. The mSA-CS membrane was characterized by FTIR, SEM, TG and mechanism performance, and used as a separator in the electrolysis cell to produce thioglycolic acid （TGA）. The experiment results showed that TGA was prepared effectively by electroreduction of dithiodiglycollic acid （DTDGA） with the mixture of TGA （w=4.61%） and DTDGA in the cathodic room. The cur- rent efficiency was up to 66.7% at room temperature with the current density of 10 mA·cm^-2. Compared with the traditional of metal reduction method, the electroreduction technology saves the zinc powder and eliminates the pollution to environment.

关 键 词：双极膜 海藻酸钠 壳聚糖 巯基乙酸 二硫代二乙酸 

分 类 号：O621.2[理学—有机化学]