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    STUDIA CHEMIA - Issue no. 2 / 2022  
         
  Article:   REMOVAL OF A BASIC TEXTILE DYE BY RELEASES OF DJEBEL ONK PHOSPHATES.

Authors:  OUISSAM BIBA, SAMIRA MESKI, HAFIT KHIRDDINE.
 
       
         
  Abstract:  
DOI: 10.24193/subbchem.2022.2.03

Published Online: 2022-06-30
Published Print: 2022-06-30
pp. 45-66

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The modified natural phosphate of djebel onk was investigated for the removal of cationic textile dye Methylene blue (MB) from aqueous solution. The modified natural phosphate rock powder (MNP) was characterized by means of XRD, IR spectroscopic and thermal analysis. Adsorption studies were carried out under various parameters such as pH, contact time, initial dye concentration and temperature. The equilibrium data were analyzed using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models, the results of modeling adsorption of Methylene blue (MB) on modified natural phosphate rock (MNP) show that the Langmuir model presents a good coefficient of correlation compared to other models. The kinetics of adsorption were best described by pseudo-second order and the thermodynamic parameters (ΔH°, ΔS° and ΔG°) of the adsorption were also evaluated. The adsorption process was found not-spontaneous and exothermic.

Keywords: Algerian phosphate, adsorption, methylene blue, isotherme
 
         
     
         
         
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