Box-Behnken design for removal of uranium VI from aqueous solution using poly ethylene glycol based dicationic ionic liquid impregnated chitosan

Authors : Süleyman İNAN, Taşkın MUMCU, Serap Seyhan BOZKURT

Pages : 756-774

View : 17 | Download : 1

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Poly ethylene glycol bis methylimidazolium di[bis trifluoromethylsulfonyl imide] was synthesized as an ionic liquid and impregnated onto chitosan. The removal of uranium VI ions from aqueous solution was investigated with batch sorption tests using ionic liquid impregnated chitosan. Response surface methodology based on 3 level Box-Behnken design was applied to analyze the effect of initial pH 4-6 , initial concentration 20-60 mg L$^{-1} $, contact time 15-105 min , and temperature 30-50 $^{\circ}$C C on the uptake capacity of uranium VI . Main effect of initial concentration, quadratic effect of contact time, and dual effect of initial pH and contact time were found statistically significant based on analysis of variance ANOVA . Probability F-value F $=$ 1.49 x 10$^{-6} $ and correlation coefficient R$^{2} \, =$ 0.96 point out that the proposed model is compatible with experimental data. The maximum uptake capacity of uranium VI was found as 28.48 mg g$^{-1}$ at initial pH 4, initial concentration 60 mg L$^{-1}$, contact time of 70 min, and a temperature of 50 $^{\circ}$C C. Sorption kinetics followed a pseudo-second-order model and Freundlich model was obtained to fit the sorption data. The presence of competing ions slightly reduced uranium VI sorption and the selectivity order can be given as UO$_{2}^{2+}$ \textgreater Zn$^{2+}$ \textgreater Ni$^{2+}$.
Keywords : Uranium VI, sorption, dicationic ionic liquid, poly ethylene glycol, chitosan, Box Behnken design