ИСТИНА

Graphite oxide is a layered material obtained by oxidation of graphite in an acidic environment. There are two main ways to obtain graphite oxide - Hammers’ and Brodie’s methods. The materials obtained by these methods (HGO and BGO) differ in degree of oxidation, composition of the oxygen-containing groups as well as ability to swell in polar liquids; HGO swells more compared to BGO. The membranes prepared from graphite oxide are capable of retaining gases and sorbing, separating, and purifying many polar liquids. At present work, the data on sorption of acetonitrile and water by HGO and BGO, as well as by membranes manufactured from these powders by vacuum filtration method, was obtained, and compared with the orientational order of the membranes. Ordering of the graphene oxide layers in the membranes was determined using spin probe technique. The orientational order parameters of spin probes in various membranes were found to be significantly different and were in the range of P20= 0.2 – 0.5. Also it was shown that the equilibrium sorption values for acetonitrile at room temperature were different as for different membranes and for membranes and corresponding powders. In contrast, the equilibrium sorption values for water were the same for graphite oxide powders and all membranes formed from these powders. The experimental data obtained indicate that the sorption properties of graphene oxide membranes depend on their internal structure; however, this dependence is complex and requires further study.