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Title: Kinetics, thermodynamics and ion exchange characteristics of thorium phosphate: An inorganic ion exchanger
Authors: Parangi, Tarun
Wani, Bina
Chudasama, Uma
Keywords: Inorganic ion exchanger;Ion exchanger;Cation exchanger;Thorium phosphate;Ion exchange thermodynamics
Issue Date: 3-Jun-2014
Abstract: Amorphous thorium phosphate, an inorganic cation exchanger of the class of tetravalent metal acid salts, has been synthesized by sol-gel method and subjected to physical, ion exchange and instrumental methods of characterization. Equilibrium constant values increase with increase in temperature for the transition metal ions (Co2+, Ni2+, Cu2+, Zn2+) and heavy metal ions (Cd2+, Hg2+, Pb2+) under study, indicating that the metal ions have higher affinity for the exchanger and that the mechanism is ion exchange. ∆G° values for all the exchange reactions are negative and become more negative with increasing temperature indicating increase in feasibility and spontaneity of the exchange process. ∆H° is positive in all cases indicating complete dehydration of ions for exchange to take place. R2 values are found to be close to unity for both Langmuir and Freundlich isotherms, providing a good fit to the experimental data for sorption of all the metal ions studied. Efficient metal ion separations have been performed which is supported by symmetrical bell shaped curves and the percentage of metal eluted. A study on regeneration and reuse of the ion exchanger shows that TP is effective up to four cycles without much decline in performance.
Page(s): 700-705
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.53A(06) [June 2014]

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