POLYDENTATE ADSORBENT BASED ON LINEN CELLULOSE MODIFIED BY HYPERBRANCHED POLYESTER POLYBENZOYLTHIOCARBAMATE
UDC 661.728; 542.91; 544.23
Abstract
A highly efficient hybrid adsorbent based on an industrially available, biodegradable, non-toxic linencellulose modified with hyperbranched polyesterpolybenzoylthiocarbamate has been synthesized.The synthesis was carried out using as a linkertoluene diisocyanate.The second-generation hyperbranched polyesterpolybenzoylthiocarbamate according to 1H, 13C NMR and IR spectroscopy contains 8 terminal benzoylthiocarbamate and 8 hydroxyl groups.In the first stage, the reaction of toluene diisociant with linen cellulose was carried out. By potentiometric titration, the content of toluene diisociant was found to be 27%. Then, hyperbranched polyesterpolybenzoylthiocarbamate was added to the modified linen cellulose. The content of hyperbranched polymer in cellulose, determined by the weight method, is 5%. Unreacted isocyanate groups are neutralized with isobutyl alcohol. The structure of the hybrid material is proven by IR spectroscopy. The adsorption properties of the polydentate adsorbent were studied with respect to Cu(II) ions. It was found that the adsorption capacity of the adsorbent is 6.93 mg/g. Using DSC and TGA analysis, the temperature characteristics, thermal effects, and mass loss of the obtained polydentate compound and its complexes were determined.It was shown that in an acidic medium at pH 3-4, desorption of Cu (II) and Co (II) ions occurs with the regeneration of a hybrid adsorbent.
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