Composition, structure and properties of composites рolyvinyl alcohol – natural zeolite
Abstract
This article is devoted to the problem of developing inexpensive and environmentally friendly organomineral
sorbents. Adsorption modification of zeolite-containing rocks of the Kholinsk and Shivyrtuy deposits
with an industrial polymer - polyvinyl alcohol, was carried out in the work. Objective: to establish a connection
of «composition – structure – properties» of composites based on PVA and clinoptilolite for creating
sorption materials with improved properties.
Synthesis was performed by impregnating finely divided fraction of mechanically activated natural
zeolite with aqueous solutions of PVA 4, 6 and 8 wt. %. The mixture was homogenized and the solvent was
removed. The formation of the surface adsorption complex confirmed by calculating the relative intensities
of the absorption bands in the IR spectra, by the apparent activation energy and the pre-exponential factor in
equation of S. Arrhenius, describing dehydration of samples by means curves of differential thermogravimetry.
The frequencies at 3620, 3440, 2850-2950 cm-1 were chosen as criteria for evaluating the adsorption interaction
of PVA and active surface centers of zeolites.
The density, hygroscopic humidity and total exchange capacity samples by аmmonium cations were
calculated. The samples with best retention of water were ХЦ-ПВС4 (1: 1) and ШЦ-ПВС8 (1: 2).
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References
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