The Regularities of Sorption of Substances of Different Nature by pH-Sensitive Acrylic Hydrogels for Plant Nanofertilizer Formation
At present, great attention is focused on learning about the interaction of pH-sensitive acrylic hydrogels with external medium and its influence on their properties. The synthetic polymeric hydrogels — acrylamide and acrylic acid copolymer (AA-AA), acrylamide and acrylonitrile copolymer (AA-AN), polyacrylamide hydrogel (PAAG) — were used in the study. The acrylic hydrogels are able to sorb substances of different nature. According to their affinity to the polymeric gels, they have the sequence: organic stain (positively and negatively charged) > Fe3+ > Cu2+ > Mn2+ > MnO4− > (Cu-Humate)− > (Fe-Humate)− > H2PO4−. Overall, the degree of their desorption has the opposite order. This points out that compounds of different nature are quite firmly held in the hydrogel matrix and only partially desorbed into the environment. The swelling of the pH-sensitive gels is observed simultaneously with sorbate sorption at alkaline pH values. Collapse of the hydrogels and desorption of the sorbed substances takes place in acidic medium. The results obtained may be considered as an experimental base for a formation of plant nanofertilizer of prolonged action.
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