高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (7): 1645.

• 研究论文 • 上一篇    下一篇

PAN膜电聚合过程及电控分离苯酚的EQCM研究

李慧, 李越, 郝晓刚, 张忠林, 刘世斌   

  1. 太原理工大学化学化工学院, 太原 030024
  • 收稿日期:2010-08-24 修回日期:2010-12-08 出版日期:2011-07-10 发布日期:2011-06-02
  • 通讯作者: 郝晓刚 E-mail:xghao@tyut.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20676089), 山西省自然科学基金(批准号: 2007011029), 山西省回国留学基金(批准号: 2008-32)和太原市科技明星专项基金(批准号: 10011611)资助.

EQCM Studies of Electropolymerization and Electrochemically Controlled Phenol Separation of Polyaniline Film

LI Hui, LI Yue, HAO Xiao-Gang*, ZHANG Zhong-Lin, LIU Shi-Bin   

  1. College of Chemistry & Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2010-08-24 Revised:2010-12-08 Online:2011-07-10 Published:2011-06-02
  • Contact: HAO Xiao-Gang E-mail:xghao@tyut.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20676089), 山西省自然科学基金(批准号: 2007011029), 山西省回国留学基金(批准号: 2008-32)和太原市科技明星专项基金(批准号: 10011611)资助.

摘要: 通过电沉积方法在镀铂石英晶片上制备了导电聚苯胺(PAN)膜,并采用电化学石英晶体微天平(EQCM)技术探讨苯胺聚合过程机制及其在苯酚溶液中的氧化还原特性。在0.5 mol/L的硫酸溶液中结合循环伏安法考察了PAN膜在完全还原态(L)-半氧化态(E)-完全氧化态(P)之间的电活性和稳定性;在不同浓度的苯酚溶液中结合恒电压阶跃法和傅立叶红外光谱(FT-IR)考察了PAN薄膜电控分离苯酚的性能。实验结果表明:苯胺在聚合过程中随膜厚增加伴随有离子的掺杂/脱掺杂并导致有规律的质量突变;PAN薄膜在完全还原态-半氧化态之间具有良好的电活性和循环稳定性;薄膜处于半氧化态时溶液中的苯酚置入膜中,处于还原态时膜中的苯酚又可逆释放到溶液中。通过控制PAN薄膜的电位可以方便地控制苯酚的置入与释放,从而达到分离溶液中苯酚的目的。

关键词: 导电聚苯胺, 电化学石英晶体微天平, 苯酚, 电控分离

Abstract: Electroactive polyaniline (PAN) thin films were synthesized on platinum substrates by electrochemical polymerization, the electrochemical quartz crystal microbalance (EQCM) technique was adopted to investigate the polymerization process of the PAN film and its redox behavior in phenol solution. Combined with cyclic voltammetry (CV), electroactivity and stability of the PAN film cycled between the reduced, leucoemeraldine (L) state and the half-oxidized, emeraldine (E) state or between L and the fully oxidized, pemigraniline (P) state were investigated in 0.5 mol/L H2SO4 solution. In mixed solutions of phenol and H2SO4, chronocoulometry and FT-IR were also used to investigate the electrochemically controlled phenol separation property of PAN film. Experimental results indicate that the abrupt changes of the film mass exist during the redox switching of PAN with the ion ejection/injection, especially with the increase of the films thickness; and PAN films have good electroactivity and stability when films are controlled between L and E during cycling process. Phenol in electrolyte will enter into the film when PAN is controlled as E; while release from the film into electrolyte again when PAN is modulated to L. Phenol enter or release from film can controlled freely by modulating the potential of PAN films, this characteristic can be used to separate the phenol from the solution.

Key words: Conducting polyaniline, electrochemical quartz crystal microbalance, Phenol, Electrochemically controlled separation

TrendMD: