化工学报 ›› 2010, Vol. 61 ›› Issue (2): 525-530.

• 材料化学工程与纳米技术 • 上一篇    

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

肖艳春,陈日耀,郑曦,陈晓,陈震   

  1. 福建师范大学化学与材料学院
  • 出版日期:2010-02-05 发布日期:2010-02-05

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

XIAO Yanchun, CHEN Riyao, ZHENG Xi, CHEN Xiao, CHEN Zhen   

  • Online:2010-02-05 Published:2010-02-05

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/mCS BPM)。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。

关键词:

双极膜, 磷酸化, 五氯吡啶, 化学镀, 电合成

Abstract:

Phosphorylated sodium alginate (P-SA) membrane was synthesized from phosphorus pentaoxide, 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[BFQ]) 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.

Key words:

双极膜, 磷酸化, 五氯吡啶, 化学镀, 电合成