Highly Efficient Composite Polysulfone Beads Containing a Calix[4]arene–Monocrown-6 Ligand and a Room Temperature Ionic Liquid for Radiocesium Separations: Remediation of Environmental Samples

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• 作者：Rajesh B. Gujar ; Seraj A. Ansari ; Prasanta K. Mohapatra
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：December 7, 2016
• 年：2016
• 卷：55
• 期：48
• 页码：12460-12466
• 全文大小：391K
• ISSN：1520-5045

文摘

Composite polymeric beads (CPBs) containing bis(octyloxy)calix[4]arene–monocrown-6 (BOCMC), room temperature ionic liquid, and polysulfone were prepared by a phase inversion technique for the selective separation of radiocesium from aqueous feeds. The CPBs displayed excellent stability with respect to the leaching of BOCMC. Experimental sorption data indicated that maximum sorption of cesium occurred within the aqueous phase of pH 4–10. However, the sorption kinetics was slow, and about 2 h of equilibration was necessary for obtaining the equilibrium conditions. The sorption kinetics data could be best fitted in the pseudo-second-order kinetics rate equation and interparticle diffusion model. The metal-ion sorption onto the beads followed the Langmuir monolayer sorption phenomenon with a cesium ion sorption capacity of 1.56 ± 0.03 mg per 1 g of CPBs. The Langmuir chemisorption process was validated from the sorption energy obtained from the Dubinin–Radushkuvich and Temkin isotherm models. In a bid to apply the sorption data for real samples, column studies were subsequently carried out. The polymeric beads, tested for the sorption of cesium from natural water samples, yielded excellent results. Trace amounts of cesium were preconcentrated from a synthetic feed of 1 L to a few millileters (volume reduction factor >100) using a column prepared by packing the CPBs with an overall recovery of 97.4%.