• Thakkar Rakesh

      Articles written in Journal of Chemical Sciences

    • A study on equilibrium and kinetics of ion exchange of alkaline earth metals using an inorganic cation exchanger – zirconium titanium phosphate

      Amin Jignasa Thakkar Rakesh Chudasama Uma

      More Details Abstract Fulltext PDF

      An advanced inorganic cation exchange material of the class of tetravalent metal acid (TMA) salt, zirconium titanium phosphate (ZTP), has been synthesized by a modified sol-gel technique. ZTP has been characterized by elemental analysis (ICP-AES), thermal analysis (TGA), FTIR and X-ray diffraction studies. The Nernst-Planck equation has been used to study the forward and reverse ion exchange kinetics of Mg (II), Ca (II), Sr (II) and Ba (II) with H (I) at four different temperatures. The mechanism of exchange is particle diffusion, as confirmed by the linear τ (dimensionless time parameter) vst (time) plots. The exchange process is thus controlled by the diffusion within the exchanger particles for the systems studied herein. Further, various kinetic parameters like self-diffusion coefficient (D0), energy of activation (Ea) and entropy of activation (ΔS*) have been evaluated under conditions favouring a particle diffusion-controlled mechanism.

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