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Research Article

Adsorption kinetics, equilibrium and thermodynamics of gas-phase toluene onto char produced from almond shells

Sinan Kutluay, Orhan Baytar, Ömer Şahin

Department of Chemical Engineering, Siirt University, Siirt, Turkey

Keywords

Abstract


Adsorption; 

Char; 

Isotherms; 

Kinetics; 

Thermodynamics; 

Toluene

Toluene is the primary material in chemical process industries and is often used as a raw material in the production of many chemicals and as a solvent in many engineering processes. In this study, the material of char, which is used as an adsorbent, was produced from almond shells. The adsorption process of gas-phase toluene onto char was investigated using a laboratory-scale fixed-bed reactor under atmospheric pressure. The structure of the char was characterized by BET and FTIR. The influences of adsorption parameters such as nitrogen (N2) flow rate as the gas-phase toluene carrier, char amount, gas-phase toluene concentration at the inlet and the adsorption temperature on both the adsorption capacity and adsorption efficiency were examined. It was found that the adsorption of the gas-phase toluene onto char could be well represented by the pseudo-second-order kinetic model. Equilibrium isotherm data were analyzed by the Langmuir and Freundlich isotherm models and the results indicated that the adsorption process was described well by the Langmuir isotherm model. The maximum monolayer adsorption capacity (qmax) of the char was determined as 15.42 mg g-1 for 303 K. Thermodynamic parameters such as ΔG° = -7.93 kJ mol-1, ΔH°= -17.18 kJ mol-1, ΔS°= -0.013 kJ mol-1 K-1 showed that the adsorption process was spontaneous, exothermic and physical. The results showed that the material of char produced from almond shells could be used as a biosorbent to remove the material of gas-phase toluene from various industrial and natural sources through the adsorption method© 2019 MIM Research Group. All rights reserved.

DOI: http://dx.doi.org/10.17515/resm2019.73en1122                          Full Text

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25/12/2019 Most Cited Paper Award: The paper authored by Manoj Sahni and Sanjeev Sharma entitled as “Elastic-plastic deformation of a thin rotating solid disk of exponentially varying density" is awarded the 2019 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM).

25/12/2019 Best Paper Award: The paper authored by Marcelo Mesquita do Amaral, Matheus Wanglon Ferreira and Mauro de Vasconcellos Real entitled as “A simplified method for analysis of reinforced concrete beams exposed to fire situation” is awarded the 2019 Best Paper Award of Research on Engineering Structures and Materials (RESM).


13/11/2019 Data articles as a new type of submision: Editorial Board of our journal have decided to accept a new type of submission: data articles. The focus of these papers is only on data and how it is collected but not on its interpretation and drawn conclusions. For more see News section.


24/5/2019 Collaboration for THERMAM 2019: Editorial Board of our journal and Organizing Committee of 6th International Conference of Thermophysical and Mechanical Properties of Advanced Materials, 8th Rostocker International Conference of Thermophysical Properties for Technical Thermodynamics have agreed to collaborate. Extended versions of the selected papers from the conference will be published in our journal. For more see Events.


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LATEST AWARDS


2019 Most Cited Paper Award:

The paper authored by Manoj Sahni and Sanjeev Sharma entitled as “Elastic-plastic deformation of a thin rotating solid disk of exponentially varying density" is awarded the


2019 Best Paper Award:

The paper authored by Marcelo Mesquita do Amaral, Matheus Wanglon Ferreira and Mauro de Vasconcellos Real entitled as “A simplified method for analysis of reinforced concrete beams exposed to fire situation” is awarded the 


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Last Update:

15.02.2020

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