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PREPARATION AND CHARACTERIZATION OF PHENOL SORBENTS BASED ON KONJAC GLUCOMANNAN AND WATER-SOLUBLE BLOCKED ISOCYANATES

Kateryna Didenko1, Natalia Kozak1,Valerii Klepko1
Affiliation: 
1 Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske Hwy., 02160 Kyiv, Ukraine
DOI: 
https://doi.org/10.23939/chcht11.03.270
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Keywords:

Abstract: 
In this work water-soluble blocked alkyl- or aryl-diisocyanate and glycopolymers based on konjac glucomannan and the blocked diisocyanate were synthesized and characterized. Their phenol sorption ability has been studied. Adsorption experiments were carried out to evaluate the effects of structure of isocyanate, polysaccharide hydroxyl group substitution degree, solution pH, contact time, on the phenol removal efficiency. Langmuir and Freundlich models were applied to describe the adsorption isotherms of phenol, and adsorption parameters were evaluated. The determined values of adsorption capacities vary from 12.8 to 25.0 mg/g depending on diisocyanate structure and polysaccharide group substitution degree. It was shown that neutral and weakly alkali mediums are favourable for phenol adsorption by the new glycopolymers.
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