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

Journal of Chemical Sciences

Chudasama Uma1¹  Amin Jignasa¹  Thakkar Rakesh¹ 

[1] Applied Chemistry Department, Faculty of Technology and Engineering, MS University of Baroda, Vadodara 390 001$$

关键词: Kinetics of ion exchange;    zirconium titanium phosphate;    cation exchanger;    tetravalent metal acid salts;    inorganic ion exchanger.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

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) vs 𝑡 (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.

【 授权许可】

Unknown