P-mSA/mCS双极膜的制备及其在电合成2,3,5,6-四氯吡啶中的应用  

Preparation of P-mSA/mCS bipolar membrane and its application in electrosynthesis of 2,3,5,6-tetrachlopyridine

作　　者：肖艳春[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,福建福州350007

出　　处：《化工学报》2010年第2期525-530,共6页CIESC Journal

基　　金：福建省自然科学基金项目(D0710009)~~

摘　　要：以五氧化二磷、磷酸三乙酯和磷酸为反应剂,制备了磷酸化海藻酸钠(P-SA),经二茂铁离子改性后作为阳膜层;用乙酰基二茂铁改性壳聚糖制备了阴膜溶胶(mCS)。将阴膜溶胶流延于阳膜层上,制备了P-二茂铁-SA/乙酰基二茂铁-CS双极膜(P-mSA/mCSBPM)。测定了双极膜的电荷密度、H^+渗透性、交流阻抗、Ⅳ曲线和SEM。以化学镀方法将金属锌和镍的合金镀在阳离子交换膜层的表面上,以实现阴极室中的零极距电解。实验结果表明,以五氯吡啶(PCP)为原料,经电催化还原脱氯制备2,3,5,6-四氯吡啶(2,3,5,6-TCP),电流密度30 mA·cm^(-2)、电解时间40 min,电流效率70.1%、产率96%。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。Phosphorylated sodium alginate （P-SA） membrane was synthesized from phosphoruspentaoxide, triethyl phosphate and phosphoric acid, and then modified by ferrocene as a linking reagent. Chitosan （CS） was modified by acetylferrocene. P-ferrocene-SA/acetylferrocene-CS bipolar membrane was prepared with a paste method, and was named as P mSA/mCS BPM. The bipolar membrane was characterized by charge density, H＋ permeability, impedance, I-V curves and SEM. Zinc/nickel layer was plated down to the surface of cation exchange layer to realize zero polar distance electrolysis in the cathode room. The experimental results showed that 2, 3, 5, 6-tetrachlopyridine （2, 3, 5, 6-TCP） was electrocatalytically synthesized at the bipolar membrane by degradation of pentachloropyridine. The current efficiency was 70.1%, yield of 2,3,5,6-TCP was 96% , when the current density was 30 mA · cm-2. Compared with the traditional Zn reduction method, the electro-reduction technology saved the zinc powder and eliminated the pollution to the environment.

关 键 词：双极膜 磷酸化 五氯吡啶 化学镀 电合成 

分 类 号：TQ028.8[化学工程]