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Thermodynamics of Organic Dyes Adsorption onto Thermal Modified Rectorite

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Abstract:

Adsorption behavior of Rhodamine B (RhB) onto thermal modified rectorite (TM-R) has been thermodynamically investigated. The thermal modified rectorite prepared at different temperatures was characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The analysis of the isotherm equilibrium data using the Langmuir and Freundlich equations by linear methods showed that the data fitted better with Freundlich model than the Langmuir model. Thermodynamic parameters were calculated based on Van’t Hoff equation. The average change of standard adsorption heat of RhB was 88.96 kJ/mol. The adsorption Gibbs free energy changes are in the range of -26.88～-34.52 kJ/mol, The negative of adsorption Gibbs free energy changes in all cases are indicative of the spontaneous nature of the adsorption interaction, and the values of adsorption entropy changes are positive.

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Advanced Materials Research II View Preview

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Periodical:

Advanced Materials Research (Volumes 463-464)

Pages:

194-197

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.463-464.194

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Online since:

February 2012

Authors:

Jing Yan Song, Ling Rong He

Keywords:

Adsorption, Methylene Blue (MB), Rectorite, Thermal Modification, Thermodynamic

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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