Kinetics of naphthalene adsorption on an activated carbon: Comparison between aqueous and organic media

被引：59

作者：

Cabal, B. ^{[1
]}

Ania, C. O. ^{[1
]}

Parra, J. B. ^{[1
]}

Pis, J. J. ^{[1
]}

机构：

[1] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain

来源：

CHEMOSPHERE | 2009年 / 76卷 / 04期

关键词：

Organic solvents; Hydrophobicity; Polarity; Adsorption rate; Polycyclic aromatic hydrocarbons; POLYCYCLIC AROMATIC-HYDROCARBONS; METHYLENE-BLUE; BASIC-DYES; REMOVAL; WATER; EQUILIBRIUM; DIFFUSION; SORPTION; ACID; MECHANISM;

D O I：

10.1016/j.chemosphere.2009.04.002

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The purpose of this work was to explore the kinetics of naphthalene adsorption on an activated carbon from aqueous and organic solutions. Kinetic curves were fitted to different theoretical models, and the results have been discussed in terms of the nature and properties of the solvents, the affinity of naphthalene to the solutions, and the accessibility to the porosity of the activated carbon. Data was fitted to the pseudo-second order kinetic model with good correlation coefficients for all the solution media. The faster adsorption rate was obtained for the most hydrophobic solvent (heptane). The overall adsorption rate of naphthalene seems to be controlled simultaneously by external (boundary layer) followed by intraparticle diffusion in the porosity of the activated carbon when water, ethanol and cyclohexane are used as solvents. In the case of heptane, only two stages were observed (pore diffusion and equilibrium) suggesting that the limiting stage is the intraparticle diffusion. The low value of the boundary thickness supports this observation. (C) 2009 Elsevier Ltd. All rights reserved

引用

页码：433 / 438

页数：6

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