Zhang Yiming, Zhang Wei, Cházaro-Ruiz Luis F
School of Natural and Built Environments, University of South Australia, SA 5095, Australia E-mail:
División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, A.C., Camino a la Presa San José 2055, Lomas 4a Sección, SLP, San Luis Potosí, 78216, México C.P.
Water Sci Technol. 2018 May;77(9-10):2311-2319. doi: 10.2166/wst.2018.152.
In this work, polyvinylidene fluoride (PVDF)/polyaniline (PANI) heterogeneous anion-exchange membranes filled with pore-forming agents polyvinylpyrrolidone (PVP) and lithium chloride were prepared by the solution-casting technique using the solvent 1-methyl-2-pyrrolidone (NMP) and a two-step phase inversion procedure. Key properties of the as-prepared membranes, such as hydrophilicity, water content, ion exchange capacity, fixed ion concentration, conductivity and transport number were examined and compared between membranes in different conditions. The pore-forming hydrophilic additives PVP and lithium chloride to the casting solution appeared to improve the ion-exchange membranes (IEMs) by increasing the conductivity, transport number and hydrophilicity. The effects of increasing membrane drying time on the porosity of the as-prepared membranes were found to lower membrane porosity by reducing membrane water content. However, pore-forming agents were found to be able to stabilise membrane transport number with different drying times. As-prepared PVDF/PANI anion-exchange membrane with pore-forming agent is demonstrated to be a more efficient candidate for water purification (e.g. desalination) and other industrial applications.
在本研究中，采用溶液浇铸技术，以1-甲基-2-吡咯烷酮（NMP）为溶剂，通过两步相转化法制备了填充有造孔剂聚乙烯吡咯烷酮（PVP）和氯化锂的聚偏氟乙烯（PVDF）/聚苯胺（PANI）非均相阴离子交换膜。对制备的膜的关键性能，如亲水性、含水量、离子交换容量、固定离子浓度、电导率和迁移数进行了检测，并在不同条件下对膜之间进行了比较。向浇铸溶液中添加亲水性造孔剂PVP和氯化锂似乎通过提高电导率、迁移数和亲水性来改善离子交换膜（IEMs）。发现增加膜干燥时间对制备的膜的孔隙率有影响，通过降低膜含水量来降低膜孔隙率。然而，发现造孔剂能够在不同干燥时间下稳定膜的迁移数。结果表明，制备的含造孔剂的PVDF/PANI阴离子交换膜是水净化（如海水淡化）和其他工业应用中更有效的候选材料。
