%0 Journal Article %A Dilwar Alam Khan, Md. %A Akhtar, Arshia %A Nabi, Syed Ashfaq %D 2014 %T Kinetics and Thermodynamics of Alkaline Earth and Heavy Metal Ion Exchange under Particle Diffusion Controlled Phenomenon Using Polyaniline-Sn(IV)iodophosphate Nanocomposite %U https://acs.figshare.com/articles/journal_contribution/Kinetics_and_Thermodynamics_of_Alkaline_Earth_and_Heavy_Metal_Ion_Exchange_under_Particle_Diffusion_Controlled_Phenomenon_Using_Polyaniline_Sn_IV_iodophosphate_Nanocomposite/2264557 %R 10.1021/je500523n.s001 %2 https://ndownloader.figshare.com/files/3900562 %K 0.03 M solution %K activation %K Heavy Metal Ion Exchange %K ion exchange %K ion exchange process %K metal ion exchange %K particle diffusion %K Particle Diffusion Controlled Phenomenon %X The poly­aniline-Sn­(IV)­iodo­phosphate nanocomposite (PANI-SnIP) has been synthesized, and its various kinetic and thermo­dynamic parameters for alkaline earth and heavy metal ion exchange were evaluated. Above 0.03 M solution of metal ions, the particle diffusion controlled phenomenon is found to be predominant (R2 > 0.98). The kinetic and thermo­dynamic parameters like diffusion coefficient (Do), energy of activation (Ea), enthalpy of activation (ΔH*), entropy of activation (ΔS*), and free energy of activation (ΔG*) were evaluated under particle diffusion controlled phenomenon. The fractional attainment of equilibrium was faster at an elevated temperature, and the rate of exchange is predominated by Hg­(II) ions in the case of multi­component systems. The positive values of the standard enthalpy change (ΔH*) indicate the endothermic nature of the ion exchange process. The ion exchange follows an associative mechanism as indicated by ΔS* < −130 J mol–1 K–1. The comparatively fast kinetics of ion exchange by the nanocomposite depicts its applicability for environmental remediation. %I ACS Publications