Adsorption of benzoic acid on a mercury electrode.

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概要

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• The differential capacity and the surface tension at the electrode-electrolyte interface of a dropping-mercury electrode were measured in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> and 0.5 M Na<SUB>2</SUB>SO<SUB>4</SUB> solutions for various concentrations of benzoic acid. On the basis of the Frumkin-Damaskin theory, the adsorption of benzoic acid on mercury was studied in the acid solution, and the parameters involved in the F-D theory were determined: <I>A</I>=1.6 μJ cm<SUP>−2</SUP> (<I>Γ</I><SUB>m</SUB>=6.5×10<SUP>−10</SUP> mol cm<SUP>−2</SUP>), <I>B</I><SUB>0</SUB>=597 l mol<SUP>−1</SUP>, <I>a</I>=−0.35–2.5 <I>E</I>/V, and <I>C</I>′=5.95 μF cm<SUP>−2</SUP>. The experimental values of the capacity and the surface tension are in good agreement with the theoretical values calculated by using the parameters obtained. The absence of an anodic maximum in the capacity-potential curve in the presence of benzoic acid was determined to be associated with a strong repulsive force between the adsorbed molecules. The value obtained for the maximum surface excess of benzoic acid is explained in terms of adsorption of the acid molecules for a vertical orientation on the electrode surface. This conclusion was supported by comparing the <I>B</I><SUB>0</SUB> value for benzoic acid with those for phenol and aniline. The adsorption of benzoic acid in neutral solutions is also discussed.

• 公益社団法人 日本化学会の論文

著者

• Taniguchi Isao

  Department Of Applied Chemistry & Biochemistry Faculty Of Engineering Kumamoto University

• Sato Norio

  Department of Chemistry, Faculty of Science, Hokkaido University

• Machida Koji

  Department of Electronic Chemistry, Graduate School at Nagatsuta, Tokyo Institute of Technology

• SEKINE TARO

  Department of Chemical Engineering, Niigata University

• Taniguchi Isao

  Department of Electronic Chemistry, Graduate School at Nagatsuta, Tokyo Institute of Technology

• Sato Norio

  Department of Applied Chemistry, Faculty of Engineering, Yamagata University

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