不同钙磷比下蛋氨酸在低结晶羟基磷灰石上吸附的等温线、动力学和热力学

Q2 Chemistry

Current Chemistry Letters Pub Date : 2023-01-01 DOI:10.5267/j.ccl.2023.4.003

A. E. Rhilassi, Oumaima Oukkass, M. Bennani-Ziatni

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引用次数: 0

摘要

研究了低结晶度羟基磷灰石对蛋氨酸的吸附性能。以羟基磷灰石的化学组成为实验变量，对吸附过程的参数和吸附剂-吸附物之间建立的机理进行了探讨。非化学计量羟基磷灰石在饱和状态下吸附量大，HPO42-离子含量高，比表面积大。实验数据与动力学模型吻合较好，证实了拟二阶动力学可以很好地描述反应机理。吸附等温线模型表明，与Freundlich、Temkin和Dubinin-Kaganer-Radushkevich的模型相比，Langmuir的模型能更好地拟合实验数据。傅里叶变换红外光谱证实了蛋氨酸- coo -离子与羟基磷灰石Ca2+离子之间的相互作用。热力学参数、不同Ca/P比的甲硫氨酸等电点和羟基磷灰石的零电荷点表明，吸附过程是自发的、放热的，通常由静电相互作用的物理吸附控制。

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Isotherms, kinetics, and thermodynamics of methionine adsorption onto poorly crystalline hydroxyapatite with different Ca/P ratios

The adsorption properties of hydroxyapatite of low crystallinity towards methionine have been examined. The chemical composition of hydroxyapatite was taken as an experimental variable in order to have a point of view on the parameters of the adsorption process and the mechanisms established between adsorbent-adsorbate. The adsorption kinetics are relatively fast, and the high amounts adsorbed at saturation are obtained for non-stoichiometric hydroxyapatite, containing more HPO42- ions and having a high specific surface area. The good agreement of the experimental data with kinetic models confirms that the mechanism can be perfectly described by pseudo-second-order kinetics. Adsorption isotherm models show that Langmuir's model gives a better fit of experimental data compared to that of Freundlich, Temkin and Dubinin-Kaganer-Radushkevich. Fourier transform infrared spectroscopy confirmed the interaction between the -COO- ions of methionine and the Ca2+ ions of hydroxyapatite. The thermodynamic parameters, the isoelectric point of methionine and the point of zero charge of hydroxyapatite with different Ca/P ratios show that the adsorption process is considered spontaneous, exothermic and often controlled by physisorption with interactions electrostatic.

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来源期刊

Current Chemistry Letters Chemistry-Chemistry (all)

CiteScore

4.90

自引率

0.00%

发文量

审稿时长

20 weeks

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