Obtaining expanded graphite by heat treatment

Abstract

One of the promising materials of the 21st century is expanded graphite or thermally expanded graphite. The preparation of nanostructure and thermally expanded graphite with improved specific surface, bulk density and expansion along the trigonal axis of the graphite matrix is associated with the thermal shock of intercalated graphite The general principle of these methods is the introduction into graphite of either gaseous substances or compounds that, during thermal heating of the intercalated compound of graphite or their derivatives, transform into a gaseous state and there by create an intralayer pressure that expands the graphite particle. In the given work thermally expanded graphite, obtained during the heat treatment crystalline hydrates of metals and nature graphite obtain expanded graphite material. The expanded graphite obtained was used as a sorbent. The performed studies in this work demonstrated the potential use of the sorbents as adsorbents for the removal of thin oil films. In this paper, it can be seen that the optimum mixture ratio of graphite to other contents (graphite : Zn(NO3)2×6H2O : graphite : FeCl3×6Н2O) is 2(g) : 8(g) : 2(g) : 8(g), which obtained the best expansion volume. Here, we propose a simple, effective method to prepare expanded graphite in which the intercalation and expansion of graphite are realized by only one step not involving any sophisticated devices.