TITLE:
Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions
AUTHORS:
Chiraz Hannachi, Fatma Guesmi, Khaoula Missaoui, Hana Tounakti, Béchir Hamrouni
KEYWORDS:
Resin; Modification; Polyethyleneimine; Factorial Design; Binary System Isotherm; Selectivity Coefficient
JOURNAL NAME:
Journal of Water Resource and Protection,
Vol.5 No.11,
November
27,
2013
ABSTRACT: In order to improve the selectivity of anion exchange resin, the surface
of gel type anion exchange resin was modified with polyethyleneimine (PEI). In the
proposed work an attempt to the utilization of commercial anion exchange resin modified
by adsorption of polyethyleneimine was investigated. Many conditions of modification
of anion exchange resin surface were studied. The influent parameters on the DOWEX
1X8 resin modification were determined using a factorial experimental design. The
ion exchange reactions were studied for modified and unmodified resin and electrolyte
solutions containing Cl-，NO3-，SO42-. All experiments were performed at constant ionic strength I
= 0.3 mol·L-1 and constant
temperature T = 298 K. Ionic exchange isotherms were established for the binary
systems:Cl-/NO3-，Cl-/SO42- and NO3-/SO42-. The obtained results show that nitrate ion was more sorbed than
chloride and sulfate. The order of preference for the anions studied in this investigation
is:NO3->Cl->SO42-. All the results given by this
resin were compared with those obtained with the AMX anion exchange membrane. Selectivity
coefficients and thermodynamic constants
for the three binary systems and for the two resins were determined. The
modified resin became more selective towards monovalent anions.