Comparative evaluation of adsorption kinetics and isotherms of a natural product removal by Amberlite polymeric adsorbents

被引:112
作者
Abdullah, M. A. [1 ]
Chiang, L. [2 ]
Nadeem, M. [1 ]
机构
[1] Univ Teknol Petronas, Dept Chem Engn, Tronoh 31750, Perak Dr, Malaysia
[2] Univ Putra Malaysia, Fac Food Sci & Technol, Dept Food Technol, Serdang 43400, Selangor De, Malaysia
关键词
Adsorption; Isotherm models; Linear and non-linear regression; Microporous polymeric adsorbents; Adsorption kinetics; AQUEOUS-SOLUTION; SORPTION; EQUILIBRIUM; CULTURES; DYES;
D O I
10.1016/j.cej.2008.06.018
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Adsorption mechanism of a natural compound, alizarin (1.2-dihydroxyanthraquinone), onto three types of microporous polymeric adsorbents (XAD-4, XAD-7. XAD-16) has been proposed using Langmuir. Freundlich and Redlich-Petersen isotherms. Adsorption capacity and optimum adsorption isotherms were predicted by linear least squares and non-linear regression method. Adsorption kinetics was proposed by pseudo-first and second second order models. The adsorption capacity of XAD-16 was the highest at 0.0424 mg/mg, with initial alizarin concentration of 200 mg/L. Pseudo-second-order kinetics was more appropriate in explaining the adsorption mechanism than pseudo-first-order. Over the studied concentration ranges. only XAD-4 adsorption can be reasonably described by the three isotherms. XAD-16 data is only best-fitted to Langmuir and Redlich-Petersen isotherms. Non-linear method proved a better way to predict the equilibrium isotherm parameters. The combination of parameters, such as specific surface area, pore diameter. polarity of the network of the resins, the solubility and polarity of the adsorbate, are the significant parameters for optimum adsorption process. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:370 / 376
页数:7
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