Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran.
Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran.
J Colloid Interface Sci. 2017 Nov 1;505:763-775. doi: 10.1016/j.jcis.2017.06.045. Epub 2017 Jun 15.
In this paper, the synergetic influence of various weight ratios of TiO 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 TiO 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 TiO 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 NaCl solutions by using GONs and TiO nanoparticles. Furthermore, the membrane ionic conductivity showed an increasing trend by utilizing TiO-co-GONs NPs. As an overall conclusion, the modified membrane containing 3wt% GONs and 1wt% TiO NPs with superior transport number and permselectivity (∼99%), highest current density and cation flux and the lowest areal electrical resistance (∼4-5Ωcm) showed the best performance.
本文研究了不同比例的 TiO2 纳米颗粒（NPs）/氧化石墨烯纳米片（GONs）在离子交换膜基质中的协同影响，以调整其电动特性，结合 GONs 的高比表面积和 TiO2 纳米颗粒的抗污染能力。研究了制备膜的形态、物理化学特性和离子传输行为。扫描光学显微镜（SOM）和扫描电子显微镜（SEM）图像显示，实验室自制膜的表面相对均匀。结果发现，GONs 和 TiO2 NPs 的存在增加了膜的表面亲水性。所有改性膜的吸水率均高于未改性膜。此外，与未改性膜相比，所有改性膜的离子交换容量、固定离子浓度、离子渗透率和通量均有所提高。在 NaCl 溶液中，使用 GONs 和 TiO2 纳米颗粒可以提高膜电位、迁移数和选择性。此外，通过使用 TiO2-co-GONs NPs，膜的离子电导率呈上升趋势。总的来说，含有 3wt%GONs 和 1wt%TiO2 NPs 的改性膜具有优异的迁移数和选择透过性（约 99%）、最高的电流密度和阳离子通量以及最低的比电阻（约 4-5Ωcm），表现出最佳的性能。
