Obtaining of Organo-Inorganic Sorbent by Modification of Vermiculite and Hydrolyzed Polyacrylonitrile Composite with Melamine

This work synthesises samples of organic-inorganic polymer sorbents and analyses their properties. To obtain an organic-inorganic sorbent exhibiting high sorbent properties, the method of obtaining a composite of 0.7 grade hydrolyzed polyacrylonitrile (GIPAN) and expanded and activated vermiculite (KFV) and the modification of this composite with melamine (MA) were presented. Vermiculite from Tebinbulok mine, a local mine, was used in the research. The sorption and desorption properties of the organic-inorganic ionite obtained as a result of the study were investigated. The experiment was conducted at 65 °C with a reflux condenser. The properties of the resulting composite were studied. Based on the IR-spectroscopic analysis of the synthesized sorbent, its composition was determined. According to the analysis of the obtained thermal stability, it was found that the sorbent does not change its composition at temperatures up to 262 °C. The structural and sorption properties of the organic-inorganic sorbent were analyzed using the Brunauer, Emmett and Teller (BET) method based on water vapour absorption at low pressure. It was found that the obtained sorbent has a high sorption property and a mesoporous structure. As a result of the research, it was found that the modified sorbent based on melamine with an amine group has the highest capacity in the study of the static exchange capacity of sorbents synthesized based on GIPAN-KFV.