氧化石墨烯/改性碳纳米管复合膜的制备及其分离水中Pb^(2+)的效果

Preparation and Pb^(2+) Separation Effect from Water of Graphene Oxide/Modified Carbon Nanotube Composite Membrane

以改进Hummers法制备的氧化石墨烯(GO)和氧化改性碳纳米管(CNT)为原料,按照不同质量比混合后,通过超声分散→离心→真空抽滤制备了氧化石墨烯/改性碳纳米管复合膜,分析了复合膜的结构、组成和形貌,并测试了该复合膜分离水中Pb^(2+)的效果。结果表明:该复合膜的结构呈片层状,改性CNT进入GO的层间使其层间距增大,且增加了膜层缺陷;当GO和改性CNT的质量比由1…2增至1…0时,复合膜的Pb^(2+)截留率由85%快速增至99%以上,水通量则由550×10^(-5) L·m^(-2)·h^(-1)·Pa^(-1)降至35×10^(-5) L·m^(-2)·h^(-1)·Pa^(-1);GO和改性CNT质量比为1…1时制备的复合膜性能较佳,Pb^(2+)截留率达到99%以上,水通量达到518×10^(-5) L·m^(-2)·h^(-1)·Pa^(-1)。

The graphene oxide（GO）obtained by a modified Hummers method and the oxidation modified carbon nanotubes（CNT）were mixed with different mass ratios.After ultrasonic dispersion→centrifugalization→vacuum filtration,the GO/modified CNT composite membranes were prepared.The structure,composition and morphology of the composite membranes were analyzed.The effects of the composite membranes on the separation of Pb^（2＋）from water were also measured.The results show that the composite membranes showed a laminar structure.The interlayer spacing of GO increased due to the intercalation of modified CNT,which also increased defects of the membrane.When the mass ratio of GO to modified CNT increased from 1：2 to 1：0,the Pb^（2＋） rejection rate of the composite membrane increased from 85% to 99% rapidly,while the water permeation decreased from 550×10^（-5） L·m^（-2）·h^（-1）·Pa（-1） to 35×10^（-5） L·m^（-2）·h^（-1）·Pa^（-1）.When the mass ratio of GO to modified CNT was 1…1,the performance of the membrane was relatively good with a Pb^（2＋）rejection rate of 99% and water permeation of 518×10^（-5） L·m^（-2）·h^（-1）·Pa^（-1）.