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A comparative study of the adsorption and electrooxidation of isomer butanediols on a gold electrode

✍ Scribed by Rudolf Holze; Teresa Łuczak; M. Bełtowska-Brzezinska

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
638 KB
Volume
35
Category
Article
ISSN
0013-4686

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✦ Synopsis

The adsorption of three isomer butanediols on a polycrystalline gold electrode from a 0.02 M NaClO, electrolyte solution has been studied with tensammetry. The free enthalpy of adsorption for 2,3-butanediol is higher than the enthalpy for 1,3-and l$butanediol; this is rationalized in terms of a molecular structure dependent surface-adsorbate interaction.

The electrooxidation of 2,3-butanediol at the gold electrode in a solution of pH 13 is much faster than the oxidation of the two other isomers; this is explained with the stronger adsorption of this isomer and the resonance effect, especially of the vicinal OH-group, which results in an easier C-H-bond rupture and increased stability of the radical reaction intermediate.

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Adsorption of Pb(II), Cu(II), Zn(II), Co(II), and Mn(II) to kaolinite was measured at 25°C in the presence of 5 mM KNO 3 . Adsorption edges (pH 3-10; total metal concentration 100 M) for Pb(II) and Cu(II) were sigmoid, but those for Zn(II) and Co(II), and especially Mn(II), were characterized by dis