Sorption of basic dyes onto granulated pillared clays: Thermodynamic and kinetic studies

被引:32
作者
Cheknane, B. [1 ,2 ,3 ]
Zermane, F. [2 ]
Baudu, M. [1 ]
Bouras, O. [2 ]
Basly, J. P. [1 ]
机构
[1] Univ Limoges, Grp Rech Eau Sol Environm, EA 4330, F-87060 Limoges, France
[2] Univ Saad Dahlab, Dept Chim Ind, Blida 09000, Algeria
[3] Ctr Dev Energies Renouvelables, Bouzareah, Alger, Algeria
关键词
CTAB aluminium-pillared montmorillonite; High shear wet granulation; Zetametry; Adsorption thermodynamic; Pseudo-first order kinetic; Intraparticle diffusion model; Diffusion coefficient; Statistical analysis; AQUEOUS-SOLUTIONS; ADSORPTION BEHAVIOR; HEXAVALENT CHROMIUM; MALACHITE GREEN; REMOVAL; EQUILIBRIUM; WATER; MONTMORILLONITE; BENTONITE; SYSTEMS;
D O I
10.1016/j.jcis.2012.05.045
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Effect of the granulation process onto the thermodynamic and kinetic sorption parameters of two basic dyes (Basic Yellow 28-BY 28 and Basic Green 4-BC 4) was evaluated in the present work. The charge surface properties of the surfactant-modified aluminium-pillared clay (CTAB-Al-Mont-PILC) particles were not modified, and the isoelectric point remains constant after high shear wet granulation. The Gibbs free energy of both BY 28 and BC 4 sorption was negative and decreased with the granulation; the endothermic nature of the sorption process was confirmed by the positive values of Delta H degrees Adsorption kinetics of the two dyes, studied at pH 6 and 150 mg L-1, follow the pseudo-first order kinetic model with observed rate constants of 2.5-4.2 x 10(-1) min(-1). The intraparticle diffusion model, proposed by Weber and Morris, was applied, and the intraparticle plots revealed three distinct sections representing external mass transfer, intraparticle diffusion and adsorption/desorption equilibrium. Diffusion coefficients, calculated from the Boyd kinetic equation, increased with the granulation and the particle size. Pseudo-first order kinetic constants, intraparticle diffusion rate constants and diffusion coefficients were determined for two other initial concentrations (50 and 100 mg(-L)) and include in a statistical study to evaluate the impact of granulation and initial concentration on the kinetic parameters. Kruskal-Wallis tests, Spearman's rank order correlation and factor analysis revealed a correlation between (i) the diffusion coefficients and granulation, and between (ii) the intraparticle diffusion rate constants and initial concentration. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码:158 / 163
页数:6
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