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Adsorption of Natural 3-Phenylpropenic Acids on Highly Dispersed Alumina Surface
Colloid Journal ( IF 1.1 ) Pub Date : 2021-04-16 , DOI: 10.1134/s1061933x21020022
V. N. Barvinchenko , N. A. Lipkovskaya

Abstract

It has been shown that adsorption of 3-phenylpropenic (cinnamic), 3-(4-hydroxyphenyl)propenic (coumaric), and 3-(3-methoxy-4-hydroxyphenyl)propenic (ferulic) acids on the surface of highly dispersed alumina is characterized by L-type isotherms according to the Giles classification. The maximum adsorption values (~3.3 × 10–4 mol/g), as well as dissociation constants (pKCOOH = 4.5 ± 0.1), are almost equal for all acids, thereby suggesting that their molecules are identically bound to the adsorbent surface via carboxyl groups. The pH dependences of the adsorption of cinnamic, coumaric, and ferulic acids are described by dome-shaped curves, and the positions of their maxima in the pH scale coincide with the thermodynamic constants of carboxyl group dissociation. A linear correlation found between the adsorption values of 3-phenylpropenic acids and their hydrophobicity parameters log P indicates a noticeable contribution of hydrophobic interactions to the adsorption of the acids on the surface of highly dispersed alumina.



中文翻译:

天然3-苯基丙酸在高度分散的氧化铝表面上的吸附

摘要

已经表明,在高度分散的氧化铝表面上吸附了3-苯基丙酸(肉桂酸),3-(4-羟苯基)丙酸(香豆酸)和3-(3-甲氧基-4-羟苯基)丙酸(阿魏酸)。根据Giles分类,其特征是L型等温线。最大吸附值(〜3.3×10 –4 mol / g)以及解离常数(p K COOH= 4.5±0.1),几乎对所有酸都是相等的,因此表明它们的分子通过羧基相同地键合到吸附剂表面上。肉桂酸,香豆酸和阿魏酸吸附的pH依赖性通过圆顶形曲线描述,其最大值在pH范围内的位置与羧基解离的热力学常数一致。在3-苯基丙酸的吸附值和它们的疏水性参数log P之间发现线性相关性, 表明疏水相互作用对高度分散的氧化铝表面上酸的吸附有显着贡献。

更新日期:2021-04-16
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