Equilibrium, kinetic and thermodynamic studies for adsorption of BTEX onto Ordered Mesoporous Carbon (OMC).

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Abstract

Chemical and petrochemical industries produce substantial amounts of wastewater everyday. This wastewater contains organic pollutants such as benzene, toluene, ethylbenzene and xylenes (BTEX) that are toxic to human and aquatic life. Ordered Mesoporous Carbon (OMC), the adsorbent that possesses the characteristics of an ideal adsorbent was investigated to understand its properties and suitability for BTEX removal. Adsorption isotherms, adsorption kinetics, the effects of initial BTEX concentrations and temperatures on the adsorption process were studied. The OMCs were characterized using surface area and pore size analyzer, transmission electron microscopy (TEM), elemental analysis, thermogravimetric analysis (TGA) and fourier transform infrared spectroscopy (FTIR). The results suggested that the Langmuir Isotherm and Pseudo-Second-Order Models described the experimental data well. The thermodynamic parameters, Gibbs free energy (ΔG°), the enthalpy change (ΔH°) and the entropy change (ΔS°) of adsorption indicated that the adsorption processes were physical, endothermic, and spontaneous. In addition, OMC had 27% higher overall adsorption capacities compared to granular activated carbon (GAC).

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Author and article information

Journal

Journal ID (iso-abbrev): J. Hazard. Mater.

Title: Journal of hazardous materials

Publisher: Elsevier BV

ISSN (Electronic): 1873-3336

ISSN (Print): 0304-3894

Publication date (Electronic): May 01 2017

Volume: 336

Affiliations

[1 ] Department of Chemical Engineering, University of Louisiana at Lafayette, P. O. Box 43675, Lafayette, LA, 70504, USA.

[2 ] Department of Civil Engineering, University of Louisiana at Lafayette, P. O. Box 43598, Lafayette, LA, 70504, USA.

[3 ] Department of Chemical Engineering, University of Louisiana at Lafayette, P. O. Box 43675, Lafayette, LA, 70504, USA; Center for Environmental Technology, The Energy Institute of Louisiana, P. O. Box 43597, Lafayette, LA, 70504, USA.

[4 ] Department of Civil Engineering, University of Louisiana at Lafayette, P. O. Box 43598, Lafayette, LA, 70504, USA; Center for Environmental Technology, The Energy Institute of Louisiana, P. O. Box 43597, Lafayette, LA, 70504, USA. Electronic address: Gang@louisiana.edu.

Article

Publisher Item ID: S0304-3894(17)30334-5

DOI: 10.1016/j.jhazmat.2017.04.073

PubMed ID: 28501747

SO-VID: 287bf021-9b49-4c30-a756-3550fe700595

History

Keywords: Ordered mesoporous carbon,Thermodynamics,Adsorption,BTEX,Kinetics

Data availability:

Keywords: Ordered mesoporous carbon, Thermodynamics, Adsorption, BTEX, Kinetics

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