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Citation: Zhu Yongchun, Dong Shaojun. STUDY ON THE ADSORPTION OF CETYL PYRIDINIUM BROMIDE ON GC ELECTRODE SURFACE[J]. Chinese Journal of Applied Chemistry, ;1989, 6(6): 48-52. shu

STUDY ON THE ADSORPTION OF CETYL PYRIDINIUM BROMIDE ON GC ELECTRODE SURFACE

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 24 March 1988
Available Online: 25 March 1989

The adsorption process of cetyl pyridinium bromide (CPyBr) on glassy carbon (GC) electrode surface in a long optical path length thin-layer cell(LOPLTC) has been investigated by an AC impedance measurement. In the high freqency region of the AC impedance complex diagram, the capacity obtained from a large semicircle with rotation was 4 times larger than that theoretically calculated from a parallel plate condenser. In the low frequency region the impedance diagrams were related to the adsorption of CPyBr and the Warburg's impedance. A charge transfer model between the layer of CPyBr adsorbed on GC electrode surface and the bulk soluticn has been suggested. A low value of diffusion coefficient and large fluid dynamics radius of CPyBr (r=352Å) were calculated from Warburg's impedance. An equivalent circuit for the impedance in the whole frequency tested has been Euggested.
- AC impedanoc measurement,
- Surfactant,
- Cetyl pyridinium bromide,
- Surface adsorption,
- Electrochemiscal analysis
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