Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
BCSJ Award Article
Experimental and Theoretical Studies of Anionic Surfactants Activity at Metal/Solution Interface: The Influence of Temperature and Hydrocarbon Chain Length of Surfactants on the Zinc Ions Electroreduction Rate
Jolanta NieszporekKrzysztof Nieszporek
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2018 Volume 91 Issue 2 Pages 201-210

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Abstract

The effect of concentration of two anionic surfactants sodium 1-octanesulfonate and sodium 1-decanesulfonate in the temperature range 288–318 K on the kinetics and mechanism of electroreduction of Zn2+ ions was studied using electrochemical impedance spectroscopy (eis) and other electrochemical methods. It was found that the process of electroreduction proceeds in two steps. To describe the mechanism of Zn2+ amalgamation, the Fawcett’s models were considered: CE (chemical step C, electron transfer step E), IE (ion transfer step I, electron transfer step E) and IA (ion transfer step I, adsorption step A). The results of theoretical investigations suggest that the IE model is the most probable mechanism of the process. Both surfactants were found to exert a catalytic effect on the analyzed electrode process. The accelerating abilities of the surfactants were found to increase with the growth of the length of their hydrocarbon chain and with the increase of temperature. The observations concerning the mechanism of the electrode reaction and its acceleration caused by surfactants were confirmed by the parameters calculated from temperature dependencies.

The accelerating effect of anionic surfactants sodium 1-octanesulfonate and sodium 1-decanesulfonate in the temperature range 288–318 K on the kinetics and mechanism of electroreduction of Zn2+ ions was studied using EIS and other electrochemical methods. The most probable mechanism of this process is IE (ion transfer and then the electron transfer) model. Fullsize Image
 
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