Application of Classic Model Equations in Describing Aqueous-Phase Adsorption Isotherm for Activated Carbon–Aromatic Compound System

IF 0.5 4区 化学 Q4 CHEMISTRY, ANALYTICAL Journal of Water Chemistry and Technology Pub Date : 2024-07-31 DOI:10.3103/S1063455X24040106
S. K. Smolin, O. V. Zabneva, O. G. Shvydenko
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Abstract

The method of isotherm simulation by approximating mathematical expressions that are valid for a small experimental section of the isotherm over the entire range of equilibrium concentrations is an important and useful tool in adsorption practice. Nine adsorption equilibrium systems of activated carbon (AC)–derivatives of aniline and phenol were examined. The adsorbent used was activated carbon obtained from fruit pits. The results of isothermal adsorption of aromatic substances with relatively small molecules on a microporous carbon adsorbent indicate the simultaneous adequacy of the Freundlich and Langmuir models to the experimental data in moderate concentration ranges ((0.1100)n mg/dm3, where n = 1, 2, 3, 4, 5). Thus, the results of adsorption from the aqueous phase do not demonstrate the energy differences of the AC surface that are incorporated into the theoretical classical model isotherms. The isotherm reflects the adsorption process on both homogeneous and heterogeneous surfaces simultaneously. This may be due to the displacement nature of adsorption from the aqueous phase, where initial surface screening by water molecules occurs during adsorbent wetting, leading to the leveling of its energetic heterogeneity. In the next stage—displacement of some water molecules by the organic adsorbate—the energetic differences of the adsorption sites are not as clearly manifested as in gas-phase adsorption. Therefore, theorizing the nature of the AC surface based on the best model simulation of experimental isotherms using classical equations becomes questionable. Three-parameter equations (Langmuir–Freundlich, Redlich–Peterson) demonstrated a finer simulation of the experiment compared to the classical two-parameter models. The study emphasizes that the mathematical description of the isotherm is a convenient method for the efficient storage and use of information about the adsorption properties of the system. It serves to compare the effectiveness of new materials with commercial analogs and to predict the performance of real purification systems under dynamic conditions.

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应用经典模型方程描述活性炭-芳香化合物体系的水相吸附等温线
摘要 通过近似数学表达式模拟等温线的方法在整个平衡浓度范围内对等温线的一小部分实验有效,是吸附实践中一个重要而有用的工具。研究了九种活性炭(AC)-苯胺和苯酚衍生物的吸附平衡体系。使用的吸附剂是从果核中提取的活性炭。分子相对较小的芳香物质在微孔碳吸附剂上的等温吸附结果表明,在中等浓度范围内((0.1-100)n mg/dm3,其中 n = 1、2、3、4、5),Freundlich 和 Langmuir 模型同时适用于实验数据。因此,水相的吸附结果并没有显示出理论经典模型等温线所包含的 AC 表面能量差异。等温线同时反映了同质表面和异质表面的吸附过程。这可能是由于从水相开始的吸附具有位移性质,在吸附剂润湿过程中,水分子会对其表面进行初步筛选,从而使其能量异质性趋于平稳。在下一阶段--部分水分子被有机吸附剂取代--吸附位点的能量差异不像气相吸附那样明显。因此,根据使用经典方程对实验等温线进行的最佳模型模拟来推测交流表面的性质是值得商榷的。与经典的双参数模型相比,三参数方程(Langmuir-Freundlich、Redlich-Peterson)对实验的模拟更为精细。该研究强调,等温线的数学描述是有效存储和使用系统吸附特性信息的便捷方法。它可用于比较新材料与商用类似物的有效性,并预测实际净化系统在动态条件下的性能。
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来源期刊
Journal of Water Chemistry and Technology
Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL
自引率
0.00%
发文量
51
审稿时长
>12 weeks
期刊介绍: Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.
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