MODIFICATION OF SODIUM HUMATE WITH ALUMINUM DIHYDROPHOSPHATE DEPENDING ON TIME AND THE RATIO OF SOLID AND LIQUID PHASES

Abstract

Abstract. Introduction. Due to their high chemical activity, humic compounds participate in various reactions. A large number of functional groups opens up wide possibilities for the humic compounds chemical modification. Most studies on the modification of humic substances are focused on studying the structure of humic substances, as well as on the factors influencing the completeness of the release of one humic substances fraction. The purpose of the work is to study the patterns of modification processes of sodium humate with aluminum dihydrogen phosphate, to determine the composition and properties of the resulting organomineral composite materials. Methods. Chemical analysis, infrared spectroscopy, X-ray analysis. Results and discussion. The composition and properties of organo-mineral composite materials obtained by conversion of sodium humate with aluminum dihydrogen phosphate have been determined. With an increase in the S:L ratio from 1:0.5 to 1:1.5, the yield of humic compounds increases from 15.62 to 21.92%, and the amount of phosphorus and nitrogen, on the contrary, the S:L=1:1.5 decreases, that is, the amount of phosphorus decreases from 37.51 to 32.19%, and the amount of nitrogen decreases from 1.78 to 1.11%. This is due to the improvement of diffusion conditions by reducing the medium viscosity and increasing the rate of primary components interaction. And the reduction in the amount of nitrogen occurs due to a decrease in ammonia consumption due to the humic substances neutralizing ability. Conclusion. It has been shown that the conversion of humic compounds with aluminum dihydrogen phosphate leads to a change in its composition and properties; the resulting products are enriched with phosphorus and nitrogen, and have good physicochemical and physicomechanical properties. After the macromolecules of humic compounds modification with aluminum dihydrogen phosphate, the number of oxygen-containing functional groups increases as a result of which the ion-exchange, complexing, sorption, detoxification and growth-stimulating properties is observed.

Keywords: sodium humate, aluminum dihydrogen phosphate, chemical modification, organomineral composite material, carboxyl and phenolic groups, complexation