چكيده به لاتين
Abstract
Ion exchange membranes are a sample of advanced separation membranes that have wide
applications in various industries. Electrodialysis is one of the most important applications of
these membranes. Ion exchange membranes should have suitable selectivity, low electrical
resistance, and high chemical, mechanical and thermal stability. So in this research, the
synthesis of heterogeneous cation exchange membranes with the aim of improving their
properties has been investigated. At first, heterogeneous cation exchange membranes were
synthesized with 1:0.5 (polymer to resin ratio) by using polysulfone polymer and two types of
cation exchange resin particles i.e., Purolite C100-E and Amberlite IR-120. The synthesized
membranes with C100-E resin has better electrochemical properties. Then, the effect of resin
particle loading was investigated for this resin. By increasing the resin ratio, the properties of
membranes such as ion exchange capacity, fixed ions concentrations, transport number,
permselectivity and electrical resistance were improved. Due to the some problems about
synthesis of PSF membranes in high percentage of resin particles, polyvinyl chloride (PVC)
was selected as the polymer matrix. PVC membranes with the ratio of 1:1 (polymer: resin)
were easily synthesized and had appropriate electrochemical properties. In order to improve
the membranes properties, Cerium Oxide (CeO2), pure Polyaniline (PANI) and modified
Polyaniline (PANI/SiO2) nanoparticles were selected as addetives. CeO2 nanoparticles
improved the properties of the membrane because of their electrical adsorption properties. The
best membrane was obtained with t+ = 0.970 and Rm = 5.42 (Ω.cm2
) in 4/100 nanoparticle to
total solid ratio. PANI nanoparticles improved the properties of membranes due to their
conductivity, adsorption and ion exchange properties. The appropriate membrane was obtained
with t+ = 0.955 and Rm = 5.63 (Ω.cm2
) in 0.4/100 nanoparticle to total solid ratio. The
PANI/SiO2 nanoparticles, in addition to the higher adsorption properties, have very high
specific surface area. The best membrane was synthesized with t+ = 0.962 and Rm = 5.14
(Ω.cm2
) in 0.4/100 nanoparticle to total solid ratio.
Keywords: Electrodialysis, Heterogeneous cation exchange membrane, Cerium oxide
nanoparticle, Polyaniline nanoparticle.
