In this work, a series of cellulose acetate (CA)/poly(vinylpyrrolidone) (PVP) membranes composed of different CA/PVP ratios were synthesized using 2-stage phase inversion protocol. The ions dialysis separation performance of the membranes was investigated using dialysis process with mix solution containing K⁺, Na⁺, Ni²⁺ and Zn²⁺ ions for separation of following pair of ions: K⁺/Zn²⁺, K⁺/Ni²⁺, Na⁺/Ni²⁺ and Na⁺/Zn²⁺. The membrane with the highest separation factor was selected for further modification with varying amount (0.1-0.7 wt. %) of acid functionalized single-walled carbon nanotubes (f-SWCNTs). The f-SWCNT infused membranes were then characterized for their hydrophilicity, thermal stability, morphology, water uptake, contact angle, pure water flux and ion dialysis separation. The FTIR spectroscopy was also used to investigate the interactions between f-SWCNTs and membrane matrix. TGA thermograms indicated improved thermal stability of f-SWCNTs infused membranes. The morphological analysis revealed asymmetric structure and uniform distribution of f-SWCNT in the membranes. The hydrophilicity of modified membranes was found to be increased as confirmed by water uptake and contact angle analysis. Water flux was found to be decreasing with the increase in infusion of f-SWCNTs. The membranes demonstrated enhanced ions separation factor with the increase in infusion of f-SWCNTs; whereas, ions permeation flux declined. It has been found that the CPC3 membrane infused with 0.5 wt. % of f-SWCNTs demonstrated almost similar ions separation properties with higher water flux as that of CPC4 and was termed as the best performing membrane.

在这项工作中，使用两阶段相转化方案合成了由不同CA / PVP比组成的一系列醋酸纤维素（CA）/聚（乙烯基吡咯烷酮）（PVP）膜。使用含有K ⁺，Na ⁺，Ni ²⁺和Zn ²⁺离子的混合溶液通过渗析工艺研究膜的离子渗析分离性能，以分离以下离子对：K ⁺ / Zn 2 ⁺，K ⁺ / Ni ²⁺，Na ⁺ / Ni ²⁺和Na ⁺ / Zn ²⁺。选择具有最高分离系数的膜进行不同量的进一步改性（0.1-0.7 重量 ％）的酸官能化单壁碳纳米管（f-SWCNTs）。然后表征f-SWCNT注入的膜的亲水性，热稳定性，形态，吸水率，接触角，纯净水通量和离子渗析分离。FTIR光谱也用于研究f-SWCNT与膜基质之间的相互作用。TGA热分析图表明，f-SWCNTs注入膜的热稳定性有所提高。形态分析显示f-SWCNT在膜中具有不对称结构和均匀分布。如通过吸水和接触角分析所证实的，发现改性膜的亲水性增加。发现水流量随着f-SWCNTs注入量的增加而降低。随着f-SWCNTs注入量的增加，膜表现出增强的离子分离因子。离子渗透通量下降。已经发现，CPC3膜注入了0.5 重量 ％的f-SWCNTs表现出与CPC4几乎相同的离子分离特性和更高的水通量，被认为是性能最好的膜。