共 32 条
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.
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页码:158 / 163
页数:6
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