Adsorption of the Uranyl Ions on an Amidoxime-Based Polyethylene Nonwoven Fabric Prepared by Preirradiation-Induced Emulsion Graft Polymerization

Abstract

A polyethylene (PE) nonwoven fabric adsorbent with amidoxime (AO) groups denoted as PE-g-PAO is prepared by preirradiation-induced emulsion graft polymerization of acrylonitrile (AN) and subsequent amidoximation of the nitrile groups of the poly(acetonitrile) (PAN) grafting chains with hydroxylamine (NH2OH). The chemical structure, thermal stability, and mechanical intensity are evaluated by means of Fourier transform infrared, thermogravimetric analysis, differential scanning calorimetry, and tensile tests, respectively. The adsorption behavior of the uranyl ions in low initial concentrations over a range of 3–50 μg/L on the PE-g-PAO nonwoven fabric is studied by the batch technique at a pH value of 7.5 at different temperatures. It can be found that the temperature induces a positive effect on the adsorption process and the adsorption capacity increases with an increase of the uranyl ion initial concentration. The adsorption data obtained under the corresponding conditions are correlated with the pseudo-first-order and pseudo-second-order kinetic and Freundlich isotherm models, respectively.

Poly(amidoxime)-reduced graphene oxide composites as adsorbents for the enrichment of uranium from seawater

“…The related thermodynamic parameters calculated from the temperature-dependent isotherms are listed in Table 4. The positive values of standard enthalpy changes (∆H 0 ) indicated an endothermic process for the adsorption of UO 2 2+ on 2.0PAO/rGO composite that was consistent with our observed results and the literature [15,16,36]. The negative values of Gibbs free energy change (∆G 0 ) indicated that UO 2 2+ adsorption on 2.0PAO/ rGO was a spontaneous process [37].…”

“…Therefore, the introduction of proper functional groups onto GO surfaces is crucial for its real application in the high extraction of UO 2 2+ from seawater. Owing to its excellent affinity with UO 2 2+ , amidoxime (AO) was widely accepted as one of the most promising binding sites for UO 2 2+ due to its specific binding affinity with UO 2 2+ [15][16][17][18]. For this reason, modification of the GO surface with AO would thought to result in the high extraction of UO 2 2+ from seawater.…”

A novel benzimidazole-functionalized 2-D COF material: Synthesis and application as a selective solid-phase extractant for separation of uranium

“…Sorption amount q e (mg g À1 ) and distribution coefficient K d (mL g À1 ) of either uranium(VI) or other metal ions were calculated according to the following formulae [30][31][32].…”

Preparation of amidoximated polymer composite based on CMK-3 for selective separation of uranium from aqueous solutions

“…2. It was clear that the peaks at 927 cm -1 and 1647 cm -1 of AO/CMK-3 were corresponded to stretching vibration of -C=N-bond and -N-O-bond respectively, and the peak at 2940 cm -1 was attributed to symmetrical stretching vibration of C-H bond [34].…”