Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (4): 756.

• Articles • Previous Articles     Next Articles

Effect of SDBS on Electron Transfer at the NB/H2O Interface by Thin Layer Method

DONG Cun-Wu, LI Li, ZHAO Xue-Ping, LU Xiao-Quan, LIU Xiu-Hui*   

  1. College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
  • Received:2009-08-14 Online:2010-04-10 Published:2010-04-10
  • Contact: LIU Xiu-Hui. E-mail: liuxh@nwnu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20875077, 20775060)资助.

Abstract:

The effect of an adsorbed anionic surfactant sodium dodecyl benzene sulfonate(SDBS) on electron transfer(ET) reaction between ferricyanide aqueous solution and decamethylferrocene(DMFc) located on the adjacent organic phase was investigated by thin layer method. The experimental results showed that the adsorption of SDBS at the interface resulted in a decay in the cathodic plateau current of bimolecular reaction across immiscible electrolyte solutions(ITIES) between DMFc in the organic phase and Fe(CN)63- in the aqueous phase. However, the rate constant of the electron transfer(ket) reaction above mentioned increased monotonically as the SDBS concentrations increased from 0 to 200 μmol/L. The reason is caused by formation patches spontaneously of SDBS on the interface and it will then influence the structure of electrical double layer on the interface, and shorten the distance between the redox centers. The surface adsorb of SDBS follow Langmuir isotherm.

Key words: Anionic surfactant; Liquid/liquid interface; Electron transfer; Thin layer method

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