Abstract
New derivatives of low- and high-molecular-weight chitosan (LMWC and HMWC), containing various functional groups, were prepared. The solubility of the compounds in aqueous solutions at pH 1–10 and the sorption and complexation of radionuclides with these compounds were studied. Water-insoluble preparations based on LMWC and HMWC efficiently sorbed 90Y and 233UO22+ with the distribution coefficients Kd > 103 ml g−1 at a phase contact time of 1 h and V/m = 100. The water-soluble preparations based on LMWC showed high complexing power toward 233UO22+ and virtually completely retained hydrolyzed U(VI) species in solutions in a wide pH range. In the presence of N-sulfosuccinyl-LMWC (N-SSLMWC), 233UO2SO4 solutions with pH 8–9 and U(VI)/N-SSLMWC weight ratio of 0.5 remained stable for 200 days, with no precipitation of hydrolyzed 233UO22+ species.
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