Adsorption of crystal violet on kaolinite clay: kinetic and equilibrium study using non-linear models

IF 1.1 4区地球科学 Q4 CHEMISTRY, PHYSICAL

Clay Minerals Pub Date : 2022-03-01 DOI:10.1180/clm.2022.18

A. Boukhemkhem, Bamhammed Aissa-Ouaissi-Sekkouti, J. Bedia, C. Belver, C. B. Molina

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引用次数: 2

Abstract

Abstract This work studied the efficiency of Tamazert kaolinite clay for adsorbing the cationic dye crystal violet from an aqueous solution in a batch system. The kinetics of the process and the equilibrium of adsorption were studied using non-linear models. The characterization of Tamazert kaolinite clay showed that it has structural, textural and surface properties that are suitable for adsorption. The effects of various process parameters such as contact time, initial dye concentration, initial pH, adsorbent dose and temperature were tested. The kinetic study using non-linear regression showed that the pseudo-second order model best fitted the experimental data. The intra-particle model was also used to estimate the contribution of intra-particle diffusion to this process. The adsorption isotherms were fitted to Freundlich, Langmuir and Redlich–Peterson models, showing that the adsorption is limited to a monolayer with a monolayer adsorption capacity of 44.2 mg g–1. The thermodynamic study indicated that the process is exothermic, spontaneous and accompanied by a decrease in entropy.

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结晶紫在高岭土上吸附的动力学和平衡研究

摘要:本文研究了塔马采特高岭石粘土对阳离子染料结晶紫的间歇吸附效果。采用非线性模型研究了该过程的动力学和吸附平衡。对Tamazert高岭石粘土的表征表明，其具有适合吸附的结构、结构和表面性能。考察了接触时间、初始染料浓度、初始pH、吸附剂剂量和温度等工艺参数对吸附效果的影响。非线性回归的动力学研究表明，拟二阶模型最能拟合实验数据。粒子内模型也被用来估计粒子内扩散对这一过程的贡献。吸附等温线符合Freundlich、Langmuir和Redlich-Peterson模型，表明吸附仅限于单层，单层吸附量为44.2 mg g-1。热力学研究表明，这一过程是自发的放热过程，并伴有熵的减小。

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来源期刊

Clay Minerals 地学-矿物学

CiteScore

3.00

自引率

20.00%

发文量

审稿时长

6 months

期刊介绍： Clay Minerals is an international journal of mineral sciences, published four times a year, including research papers about clays, clay minerals and related materials, natural or synthetic. The journal includes papers on Earth processes soil science, geology/mineralogy, chemistry/material science, colloid/surface science, applied science and technology and health/ environment topics. The journal has an international editorial board with members from fifteen countries.