管式氧化石墨烯膜用于乙醇脱水过程

Tubular graphene oxide membrane for dehydration of ethanol

为了研究新型二维氧化石墨烯膜材料在乙醇脱水过程中的应用,采用改进的Hummers法制备氧化石墨烯,通过傅里叶变换红外光谱仪(FT-IR)、热分析仪(TG-DSC)和场发射扫描电子显微镜(FESEM)等表征氧化石墨烯的微结构及性质。以管式陶瓷超滤膜为支撑体,采用浸渍提拉法制备完整无缺陷的氧化石墨烯膜。结果表明:将所制备的氧化石墨烯陶瓷复合膜用于乙醇脱水过程,此膜对水分子表现出优先选择透过性。当原料液中水质量分数为10%,操作温度为60℃时,乙醇-水的分离因子可以达到36以上,渗透通量达到2.5 kg/(m2·h)。氧化石墨烯陶瓷复合膜可以操作100 h以上,并保持一定的分离性能,具有较好的稳定性。

To investigate the dehydration of ethanol by using 2D graphene oxide as membrane materials,graphene oxide was prepared by a modified Hummers method and characterized by Fourier-transform infrared spectrum（ FT-IR）,thermal analysis（ TG-DSC）,and field emission scanning electron microscope（ FESEM）. Graphene oxide membrane was prepared by a dip-coating method on the outer surface of a tubular ultrafiltration alumina membrane. As-prepared membrane was applied to the dehydration of ethanol in pervaporation process and the result showed a selective permeability for water. The separation factor of water to ethanol was about 36 and the permeability was about 2. 5 kg /（ m^2·h） when the pervaporation process was carried out at 60 ℃ and the content of water was 10% in the feed. After operated for 100 h,the graphene oxide membrane showed a stable performance for the dehydration of ethanol.