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  Global Journal of Physical Chemistry. Volume 2, Issue 3 (2011) pp. 264-276
  Research Article
 
Kinetic studies of some hazardous metal ions in the particles of polyacrylamide Sn(IV) molybdophosphate as 'organic – inorganic' composite cation – exchanger
  I. M. El-Naggar a, E. A. Mowafy a, E. A. Abdel-Galil a,*, M. F. El-Shahat b  
     
a Atomic Energy Authority, Hot Labs. Centre, P. No. 13759, Egypt
b Chemistry Department, Faculty of Science, Ain Shams University, Egypt

   
  Abstract  
 

The mechanism of diffusion of Fe3+, Co2+, Cu2+, Zn2+, Cd2+, Cs+, Pb2+ and Eu3+ in the H -form of polyacrylamide Sn(IV) molybdophosphate composite as cation exchanger was studied as a function of particle size, concentration of the exchanging ions, reaction temperature, drying temperature and pH. The exchange rate was controlled by particle diffusion mechanism as a limited batch technique and is confirmed from straight lines of B versus 1/r2 plots. The values of diffusion coefficients, activation energy and entropy of activation were calculated and their significance was discussed. The data obtained have been compared with that reported for other organic and inorganic exchangers.

     
  Keywords  
  Synthesis; diffusion; ion exchange; polyacrylamide Sn(IV) molybdophosphate; composite; thermodynamic parameters  
     
   
   
   
   
     

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