用于海水淡化的氧化石墨烯/聚酰亚胺复合薄膜的性能研究

Properties of Graphene Oxide/Polyimide Composite Film for Seawater Desalination

将改进Hummer法合成的氧化石墨烯(GO)分散到聚酰亚胺(PI)基体中,运用真空抽滤装置制备用于海水淡化的GO/PI复合薄膜,对复合薄膜的性能进行研究。结果表明:适量的GO(质量分数为0.010)能够明显改善薄膜的表面形貌,消除或减少薄膜表面孔洞和裂纹;与PI薄膜相比,GO/PI复合薄膜的亲水性能和拉伸性能提高;加入适量的GO(质量分数为0.010)后,复合薄膜具有较好的脱盐性能,且随着温度升高,脱盐性能提高,当温度达到75℃时,其具有较大的离子去除率(99.4%)和水渗透量(36.1 kg·m^-2·h^-1);经多次试验后,复合薄膜的脱盐性能仍能保持较高水平,稳定性较好。GO/PI复合薄膜有望成为一种用于海水淡化的新型反渗透薄膜。

The graphene oxide(GO)synthesized by the improved Hummer method was dispersed in the polyimide(PI)matrix,the GO/PI composite film for the seawater desalination was prepared by using a vacuum filtration device,and the properties of the composite film were studied.The results showed that,with the appropriate amount of GO(mass fraction was 0.010),the surface morphology of the film was significantly improved,and the surface holes and cracks of the films were eliminated or reduced.Compared with PI film,the hydrophilic property and tensile property of GO/PI composite films were improved.After adding an appropriate amount of GO(mass fraction was 0.010),the composite film had better desalination property,and as the temperature increasing,the desalination property was improved.When the temperature reached 75℃,the composite film had a large ion removal rate(99.4%)and water permeability(36.1 kg·m^-2·h^-1).After several tests,the desalination property of the composite films could still be maintained at a high level,showing good stability.GO/PI composite film showed great potential to be used as the reverse osmosis film for the seawater desalination.