Study of the possibility of the absorption and desorption of manganese ions and its amino acid complexes by acrylic hydrogel
Abstract
At present, the search for effective methods of irrigation and enrichment of agricultural lands with microelements is an urgent task. One such method is the use of superabsorbents, as they combine the ability to retain large volumes of water solutions and prolonged absorption and desorption of fertilisers and biopreparations. One of the microelements additionally introduced into the soil for normal plant development is manganese. In recent years, it has been proved that using organic complex compounds of micronutrients as fertilisers is much more effective compared to the use of their inorganic salts.
The aim of this study was to consider the processes of absorption and desorption of manganese ions and its amino acid complexes from aqueous solutions by acrylic hydrogel. By IR spectroscopy and spectrophotometry, we determined the mechanisms of interaction of manganese ions and its compounds with the studied hydrogel, obtained kinetic curves of sorption and desorption, and quantified the absorption and desorption rates at different hydrodynamic modes and initial concentrations of manganese ions in solutions.
It was shown that the absorption of manganese ions from aqueous solutions of both manganese sulphate and bisglycinate proceeds mainly by the formation of chelate complexes with the participation of hydrogel functional groups as ligands. The optimal sorption parameters (process time, hydrodynamic mode, and initial concentrations of solutions) were determined experimentally. When the concentration of manganese ions exceeded 15 mg/dm3, the shares of absorbed and released manganese decreased, indicating additional cross-linking of the hydrogel. We demonstrated the possibility of manganese re-release from the polymer mesh.
The obtained results showed that the hydrogel based on potassium acrylate, acrylamide, and acrylic acid monomers studied in this work can be used as a source of irrigation and additional nutrition for plants.
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