Chrome-Polymer Composite as a Precursor for Obtaining a Sorbent with Selective Propeties
V. Gutsanu, A.-M. Ipate, G. Lisa, M. Botnaru
Том 87 №3
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A composite based on a cross-linked ionic polymer containing functional groups [-N(CH3)3]+ and a Cr3+ cation was obtained and studied. As a result of the contact of the polymer with the KCr(SO4)2 solution, the jarosite mineral-type composite is formed: R4N[Cr3(OH)6(SO4)2], in which R4N+ is the polymer group. Considering that the composite can be used as a sorbent with selective properties, its stability in solutions of KCl, Na2CO3, Na2SO4, NaNO3, NaF and Na2S was investigated. In concentrated NaCl solutions, the original composite is transformed into another, as a result of the replacement of SO42- with Cl- ions. The regenerated polymer is capable of forming a composite again. Using FTIR, SEM EDX and thermogravimetry methods, the changes that occur in the polymer phase during composite formation and its regeneration were studied. It has been shown that the composite has selective sorption properties.