Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 505, Issue -, Pages 763-775Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.06.045
Keywords
TiO2 nanoparticles-co-GO nanoplates; Mixed matrix; Ion exchange; Electrodialysis; Transport behavior; Synergetic influence
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Funding
- Arak University
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In this paper, the synergetic influence of various weight ratios of TiO2 nanoparticles (NPs)/graphene oxide nanoplates (GONs) in the matrix of ion exchange membranes was examined in order to adapt their electrokinetic properties based on the combination of the high specific surface area of GONs and the antifouling ability of TiO2 nanoparticles. The morphology, physico-chemical features and ionic transport behavior of prepared membranes was studied. Scanning optical microscopy (SOM) and scanning electron microscopy (SEM) images showed a uniform surface for the lab-made membranes relatively. It was found that surface hydrophilicity of the membrane was increased in the presence of GONs and TiO2 NPs. All modified membranes showed a higher water uptake than unmodified membranes. Furthermore, a higher ion exchange capacity, fixed ionic concentration, ionic permeability and flux were observed for all modified membranes in comparison with unmodified membranes. The membrane potential, transport number and selectivity improved in NaCI solutions by using GONs and TiO2 nanoparticles. Furthermore, the membrane ionic conductivity showed an increasing trend by utilizing TiO2-co-GONs NPs. As an overall conclusion, the modified membrane containing 3 wt% GONs and 1 wt% TiO2 NPs with superior transport number and permselectivity (similar to 99%), highest current density and cation flux and the lowest areal electrical resistance (similar to 4-5 Omega cm(2)) showed the best performance. (C) 2017 Elsevier Inc. All rights reserved.
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