Hosseini S M, Ahmadi Z, Nemati M, Parvizian F, Madaeni S S
Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran E-mail:
Membrane Research Centre, Department of Chemical Engineering, Faculty of Engineering, Razi University, Kermanshah 67149, Iran.
Water Sci Technol. 2016;73(9):2074-84. doi: 10.2166/wst.2016.030.
In the current study mixed matrix heterogeneous cation exchange membranes were prepared by solution casting technique. The effect of SiO(2) nanoparticles in the polymeric solution on the physicochemical properties of prepared membranes was studied. Scanning optical microscope images showed uniform particle distribution and relatively uniform surfaces for the prepared membranes. The membrane water content was reduced by silica nanoparticles in the membranes' matrix. The membrane ion exchange capacity, membrane potential, transport number and selectivity were improved initially by an increase of SiO(2) nanoparticles concentration up to 1%wt in prepared membranes and then showed a decreasing trend with a further increase in additive ratio from 1 to 4%wt. The ionic permeability and flux were also decreased initially by an increase of silica nanoparticles concentration up to 0.5%wt in the membrane matrix and then increased again with a further increase in nanoparticles concentration from 0.5 to 4%wt. Moreover, the results exhibited that using silica nanoparticles in the membrane matrix caused an obvious decrease in areal electrical resistance. The opposite trend was found for membrane mechanical strength using SiO(2) nanoparticles.
在当前研究中，通过溶液浇铸技术制备了混合基质异质阳离子交换膜。研究了聚合物溶液中二氧化硅纳米颗粒对所制备膜的物理化学性质的影响。扫描光学显微镜图像显示所制备的膜具有均匀的颗粒分布和相对均匀的表面。膜基质中的二氧化硅纳米颗粒降低了膜的含水量。在所制备的膜中，随着二氧化硅纳米颗粒浓度增加至1%wt，膜的离子交换容量、膜电位、迁移数和选择性最初有所提高，然后随着添加剂比例从1%wt进一步增加至4%wt，呈现下降趋势。膜基质中二氧化硅纳米颗粒浓度增加至0.5%wt时，离子渗透性和通量最初也降低，然后随着纳米颗粒浓度从0.5%wt进一步增加至4%wt再次升高。此外，结果表明在膜基质中使用二氧化硅纳米颗粒会导致面电阻明显降低。对于使用二氧化硅纳米颗粒的膜的机械强度，发现了相反的趋势。
