Evaluation of charge density and the theory for calculating membrane potential for a nano-composite nylon-6,6 nickel phosphate membrane
Abstract
A new crystalline organic–inorganic nano-composite nylon-6,6 nickel phosphate membrane was
synthesised subsequent to which (a) the physico-chemical characteristics of the membrane were
evaluated employing FTIR, SEM, EDX, TEM, XRD and porosity measurements, and
(b) membrane potential measurements were conducted employing different concentrations
(0.0001 r c (M) r 1) of KCl, NaCl and LiCl 1 : 1 electrolyte solutions. The Teorell, Meyer and
Sievers (TMS) theoretical method was employed for evaluating the charge density of the
synthesised membranes, and the observed data were utilised to calculate membrane potentials
using the extended TMS theory. Charge density for 1 : 1 electrolyte solutions was found to
decrease in the order KCl > NaCl > LiCl, which is in accordance with a decrease in the size of
the cation. The synthesised membrane was found to be cation-selective with the measured
membrane potentials found to be positive in all instances, decreasing in the order
LiCl > NaCl > KCl, which is in accordance with an increase in the size of the cation for the
chosen electrolytes. Observed potential data were used to calculate the transference numbers,
mobilities, distribution coefficients, and charge effectiveness of ions and the theoretically calculated
potential values were found to be in good agreement with the experimentally observed values
URI
http://hdl.handle.net/10394/17570http://pubs.rsc.org/en/content/articlelanding/2012/cp/c2cp42683h
http://dx.doi.org/10.1039/C2CP42683H