Indian Journal of Advances in Chemical Science Volume: 6, Issue 2: , April 2018

 
             
   
   

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI: 10.22607/IJACS.2018.602005

 

   

Research Article

 

      Removal of Fluoride from Aqueous Solution by Adsorption on Perchloric Acid Cross-linked Calcium Alginate    
Vijaya Yarramuthi*, Jaya Malathi Jagadeeson, Karuna Devi Rachapudi, Raja Kumar Challagundla
 
ABSTRACT
 

A novel biosorbent was developed by the crosslinking of an anionic biopolymer, calcium alginate (CA), with perchloric acid (PCA). The PCA cross-linked was characterized by Fourier-transform infrared, scanning electron microscopy (SEM), transmission electron microscopy, X-ray diffraction, and surface area analysis. Experimental parameters affecting the adsorption process such as pH, agitation time, concentration of adsorbate, and amount of adsorbent were studied. Langmuir and Freundlich isotherms were used to fit the experimental data. The best interpretation for the equilibrium data was given by the Langmuir isotherm. The maximum adsorption capacity for fluoride was 44 mg/g based on the Langmuir equation at a temperature of 28°C, a solution pH of 3.0, a adsorbent dosage of 0.7 g/100 mL, and a contact time of 120 min. The experimental data were analyzed using three sorption kinetic models, namely, pseudo-first-order, pseudo-second-order, and intraparticle diffusion model. Results show that the pseudo-second-order equation provides the best correlation for the adsorption process. The findings of the present study indicate that PCA can be successfully used for the removal of fluoride ions from aqueous solutions.

     
     

Key words: Perchloric acid, Defluoridation, Adsorption, Isotherms, Kinetics.

 

 

[Download Full Article PDF]

               
     
                 
     
                 
                 
                 
               
                 
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     

Copyright © 2012 KROS Publications