Adsorption Of U(Ⅵ) In Aqueous Solution By Chitosan Based Materials

A large amount of contaminated ground water due to uranium which produced by uranium hydrometallurgy process should deal with advanced treatment.In this work, magnetic hydrothermal cross-linking chitosan(HCC-Fe3O4), ion-imprinted hydrothermal cross-linking chitosan(ion-imprinted HCC) and Sodium tripolyphosphate with hydrothermal cross-linking chitosan(HCC-TPP) were prepared. The adsorption of U(VI) on the materials from aqueous solutions was investigated.The magnetic hydrothermal cross-linking chitosan(HCC-Fe3O4) was produced by hydrothermal carbonization. The characteristics of sorbent of adsorbing U(VI) from aqueous solutions were investigated and results showed that maximum adsorbed amount of sorbent were 263.2 mg/g at U(VI) concentration of 50 mg/L, volume of 100 mL. The experiment data correlated with Langmuir model and pseudo-second-order model, and the uranium adsorption capacity increased from 327.1 to 368.7mg/g under the optimum pH 7.0. Sorption of uranium was endothermic and reaction was spontaneous. The Sodium tripolyphosphate(STPP) hydrothermal cross-linking chitosan(HCC-TPP) was produced which was rich in amino and phosphate groups. The characteristics of sorbent of adsorbing uranium(VI) from aqueous solutions were investigated. The U(VI) sorption capacity was 392.2 mg/g at pH of 7.0,contact time of 180 min and sorbents of 0.01 g.The selective experiments illustrated that HCC-TPP had higher selectivity.