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Adsorption Isotherm Measurement and Correlation of Toluene and n-Hexane on Activated Carbon in an Aqueous Solution

Nguyen, My Ann Hoa (2005) Adsorption Isotherm Measurement and Correlation of Toluene and n-Hexane on Activated Carbon in an Aqueous Solution. Universiti Teknologi Petronas. (Unpublished)

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Abstract

Thenumber of hazardous waste disposals reported has increased in recentyearsdue to improper management of chemical generated by chemical and petrochemical industries. Volatile organic compounds are one of the major pollutants to the environment. Two of the volatile organics compounds selected for this study are toluene and n-hexane are The adsorption measurement in aqueous solutions has been carried out by using batch system at 35°C, 55°C and 65°C with the range of initial concentration between 10 to 200ppm. There are three types of activated carbon that have been used, which are Granular Activated Carbon (GAC) 2.5mm, Granular Activated Carbon 0.25mm, and Powder Activated Carbon. The objectives of this study are to determine the adsorption isotherms of toluene and n-hexane on activated carbon through the adsorption process, to investigate the effect of temperature on the adsorption capacity of toluene and n-hexane, and to model the experimental adsorption isotherm databy using the established adsorption isotherm equations on activated carbon. The equilibrium concentrations have been analyzed using UV-Vis Spectrophotometer and Gas Chromatography with Purge and Trap after the solutions were adsorbed for 24 hours. The toluene adsorption isotherm has the S-shaped form and of type V isotherm based on the classification of Brunaeur, Deming, Deming and Teller (BDDT). Among the three temperature conditions, it is found that the adsorption favors the lowest temperature (35°C). This indicates that adsorption process is exothermic, lower the temperature will shift the adsorption equilibrium to adsorption rather than desorption. GAC 2.5 mm is found to have the highest adsorption capacityamongthe others. It is impossible to carry out the experimentwith n-hexane due to its high volatility. The amount of n-hexane is considered negligible in aqueous solution and adsorption process does not require. Freundlich isotherm is the most popular model which is widely used in the correlation of liquid adsorption. Sips isotherm which is the combination between Langmuirand Freundlichequation is an alternative model. However, the techniques were not successful with toluene isotherm measurement.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:46
URI: http://utpedia.utp.edu.my/id/eprint/7597

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