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DJPS

Diyala Journal For Pure Science

Scientific Refereed Journal Published By College of Science - University of Diyala

 

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djps.1402.409B

Diyala Journal For Pure Sciences DJPS

ISRA Impact Factor:3.715

P- ISSN:2222-8373, E-ISSN:2518-9255

Volume 14, Issue 2 , April . 2018

 

 

Thermodynamic Study of The Adsorption of Some Azo Dyes on Activated Carbon

 

Emad Abdulilah Salih Al-Hyali , Mohammad Thamer Hamed Al-Neemy        

 

Year: 2018, Volume: 14, Issue: 2

 

Pages: 203-220 , DOI: http://dx.doi.org/10.24237/djps.1402.409B

 

Language: English

 

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Abstract


 

This work is concerned with studying the adsorption of some azo dyes better on commercial activated carbon. The dyes were synthesized by considering the resorcinol as constant part in their structure which is reacted with a number of para substituted aniline via dizonium ions and used as adsorbate for achieving this study. These dyes were identified by a number of physical tests and the available spectroscopic methods. Three models of adsorption isotherms namely, Freundlich, Langmuir , and Tempken are applied to fit the experimented data of adsorption at equilibrium in the range of concentration (1*10-4- 5*10-4)M at various temperatures (292-328)K, and using (1gm/L) of the Adsorbent (Activated Carbon). The results showed that, the Freundlich isotherm is better fitted to the experimental data of the studied systems, although Langmuir isotherm exhibited good fit. This work included performing thermodynamic, depending on calculating the equilibrium constants by different methods, which represented by Freundlich constant Kf, Langmuir constant (KL) and finally is described by Tempkin constant (TK). The results showed good consistency among the four sets of functions in terms of their values and physical meaning. This consistency gave good indication for the accuracy of such kind of calculation.

 

Key words: adsorption, azo dye, Adsorption isotherms, Thermodynamic study.

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