10.1021/je500523n.s001
Md. Dilwar Alam Khan
Md.
Dilwar Alam Khan
Arshia Akhtar
Arshia
Akhtar
Syed Ashfaq Nabi
Syed Ashfaq
Nabi
Kinetics
and Thermodynamics of Alkaline Earth and Heavy Metal Ion Exchange
under Particle Diffusion Controlled Phenomenon Using Polyaniline-Sn(IV)iodophosphate
Nanocomposite
American Chemical Society
2014
0.03 M solution
activation
Heavy Metal Ion Exchange
ion exchange
ion exchange process
metal ion exchange
particle diffusion
Particle Diffusion Controlled Phenomenon
2014-08-14 00:00:00
Journal contribution
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
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 (<i>R</i><sup>2</sup> > 0.98). The kinetic and thermodynamic parameters like
diffusion coefficient (<i>D</i><sub>o</sub>), energy of
activation (<i>E</i><sub>a</sub>), enthalpy of activation
(Δ<i>H</i>*), entropy of activation (Δ<i>S</i>*), and free energy of activation (Δ<i>G</i>*) 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 (Δ<i>H</i>*) indicate
the endothermic nature of the ion exchange process. The ion exchange
follows an associative mechanism as indicated by Δ<i>S</i>* < −130 J mol<sup>–1</sup> K<sup>–1</sup>. The comparatively fast kinetics of ion exchange by the nanocomposite
depicts its applicability for environmental remediation.