A novel ionic liquid-impregnated chitosan application for separation and purification of fission ⁹⁹Mo from alkaline solution

Abstract

In this investigation, a novel application of Aliquat 336 (tricaprylmethylammonium chloride)-impregnated chitosan (AICS) for the separation and purification of 99Mo from some fission products, such as 137Cs, 85Sr and 131I, in alkaline solution is presented. Before impregnation, pristine chitosan experienced no adsorption affinity for Mo. However, this situation dramatically changed after the impregnation. The structure of AICS was elucidated by FTIR, SEM and EDX spectra. The influence of contact time, solution pH, weight of AICS, initial Mo concentration and temperature on the adsorption process was studied. Kinetic studies revealed that the rate of adsorption was impressively very fast and only 3 min were sufficient to reach equilibrium. The pH influence showed that Mo could be effectively adsorbed over a wide range of pH 3–11. The equilibrium data fitting to isotherms models followed the order Langmuir > Freundlich > Dubinin-Radushkevich. Based on the Langmuir model, the maximum adsorption capacity was computed at 60.1 mg/L. Thermodynamic studies indicated that the adsorption process is spontaneous and endothermic in nature. Finally, a pure solution of 99Mo with a purity >99 % was obtained from a real sample. The data obtained confirmed that AICS is a promising candidate for separation and purification of 99Mo from alkaline media.

Facile fabrication of a phosphonium-based ionic liquid impregnated chitosan adsorbent for the recovery of hexavalent chromium

“…Moreover, N–H bending and C–H, C–O, and C O stretching vibrations were observed at 1569, 2880, 1154, and 1657 cm −1 , respectively. 14,23 Changes were observed after the impregnation process, such as the shifting and broadening of the hydroxyl peak from 3400 to 3451 cm −1 . Moreover, shifting also occurred in the C–N bending vibrations from 1375 to 1359 cm −1 , and the occurrence of two additional peaks at 2938 and 2881 cm −1 was assigned to the IL C–H 2 .…”

“…12 Chitosan-IL has also been applied to the adsorption of Cr(VI), Hg(II), Ce(II), Sr(II), and Mo(II). 13,14 Aside from metal adsorption, chitosan-IL has also been used in the removal of dyes and herbicides. 15,16 Lin et al reported an interesting application for the immobilization of IL using a chitosan-based capsule.…”

Preparation and Evaluation of a material containing both micropores and mesopores as a dual-function adsorbent for removal of cationic and anionic species from aqueous solutions

“…Sorption of these isotopes, especially anionic ones such as 99 Tc (t1/2 2.13×10 5 y) and 93 Mo (t1/2 4×10 3 y) has been challenging. 99 Tc and 93 Mo are weakly sorbed by most solid phases [22,31].…”

Application of solid waste as an adsorbent for capture of 137 Cs, 85 Sr and 131 I from environmental water

“…Various technologies are employed to remove the radioisotopes from radioactive wastewater, including adsorption [9][10][11], impregnation [12], ion exchange [13][14][15][16],…”