2018 (3) 6

https://doi.org/10.15407/polymerj.40.03.184

Сross-linked polysaccharide konjac glucomannan: synthesis, characterization and phenol adsorption

K.S. Didenko, N.V. Kozak, V.V. Klepko

Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine; didenko.katherina@gmail.com

Polym. J., 2018, 40, no. 3: 184-189

Section: Synthesis polymers.

Language: English.

Abstract:

New polymeric adsorbents based on water soluble polysaccharide konjac glucomannan cross-linked with blocked alkyl- and aryl-, di- or polyisocyanate were synthesized and used for phenol adsorption from aqueous solutions. The interaction of polysaccharide with е-caprolactam blocked isocyanates was confirmed by pyrolysis mass-spectrometry. Glycopolymers based on cross-linked konjac glucomannan demonstrate good phenol sorption ability. To describe phenol adsorption on glycopolymers Langmuir and Freundlich models were used. The influence on phenol adsorption capacity of polysaccharide hydroxyl group substitution degree, isocyanate structure as well as pH value was analyzed. Adsorption equilibrium had been reached after 24 hours contact with phenol, nevertheless, 75–80% of phenol is adsorbed during first 6–8 hours. The highest phenol adsorption capacity onto GP had been reached at neutral medium whereas adsorption capacities at acid and alkali media are slightly lower. In contrast to glycopolymers based on aliphatic diisocyatate glycopolymers based on aromatic ones show higher adsorption capacity. This indicates the important role of p–p interactions between aromatic rings of adsorbate and polymeric matrix during adsorption.

Keywords: phenol adsorption, glycopolymers, konjac glucomannan, blocked isocyanates, adsorption isotherm.

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