Role of the surface layer of epoxy resin

Abstract

Water pollution threatens human health, and the safe supply of drinking water has been recognized as a problem worldwide. The increasing accumulation of heavy metals in water from various sources has led to the search for effective and environmentally friendly treatment methods and materials for their removal. To impart the necessary characteristics to minerals, in particular to improve sorption properties, one of the methods is modification. Modern technologies using sorbents require qualitatively new sorption materials with increased capacity and high selectivity of action. Epoxy resins are widely used as a base material in the coating field due to their advantages including adsorption properties. In this work, shungite from the Koksu deposit and Shankhanai zeolite were used as natural sorbents for modification. The purpose of this work is to study the interaction of epoxy resin ED-20 with the surface of a natural sorbent through a layer of polyethylene polyamine. Methodology. To study the surface of the prepared samples, methods such as infrared spectroscopy, gravimetry and the temperatureprogrammed desorption method were used. Results and discussion. This article presents the results of IR spectroscopic analysis of natural sorbents shungite and zeolite modified with epoxy resin ED-20 and polyethylene polyamine. The obtained surface epoxy layers were studied for resistance to aqueous environments of varying acidity for 90 days. The acid-base properties of the surface layers of modified sorbents were studied by the method of temperature-programmed ammonia desorption. Conclusion. By modifying shungites and zeolites with polyethylene polyamine, followed by cross-linking them on the surface of a natural mineral with ED-20 epoxy resin, a durable layer of epoxy resin was obtained.