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Molecules 2018, 23(6), 1245; https://doi.org/10.3390/molecules23061245

Phosphate-Based Ultrahigh Molecular Weight Polyethylene Fibers for Efficient Removal of Uranium from Carbonate Solution Containing Fluoride Ions

1
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2
Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editors: Melissa A. Denecke and Laura Leay
Received: 24 April 2018 / Revised: 17 May 2018 / Accepted: 22 May 2018 / Published: 23 May 2018
(This article belongs to the Special Issue Radiation Chemistry for New Materials and Applications)
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Abstract

This work provides a cost-effective approach for preparing functional polymeric fibers used for removing uranium (U(VI)) from carbonate solution containing NaF. Phosphate-based ultrahigh molecular weight polyethylene (UHMWPE-g-PO4) fibers were developed by grafting of glycidyl methacrylate, and ring-opening reaction using phosphoric acid. Uranium (U(VI)) adsorption capacity of UHMWPE-g-PO4 fibers was dependent on the density of phosphate groups (DPO, mmol∙g−1). UHMWPE-g-PO4 fibers with a DPO of 2.01 mmol∙g−1 removed 99.5% of U(VI) from a Na2CO3 solution without the presence of NaF. In addition, when NaF concentration was 3 g∙L−1, 150 times larger than that of U(VI), the U(VI) removal ratio was still able to reach 92%. The adsorption process was proved to follow pseudo-second-order kinetics and Langmuir isotherm model. The experimental maximum U(VI) adsorption capacity (Qmax) of UHMWPE-g-PO4 fibers reached 110.7 mg∙g−1, which is close to the calculated Qmax (117.1 mg∙g−1) by Langmuir equation. Compared to F, Cl, NO3, and SO42 did not influence U(VI) removal ratio, but, H2PO4 and CO32 significantly reduced U(VI) removal ratio in the order of F > H2PO4 > CO32. Cyclic U(VI) sorption-desorption tests suggested that UHMWPE-g-PO4 fibers were reusable. These results support that UHMWPE-g-PO4 fibers can efficiently remove U(VI) from carbonate solutions containing NaF. View Full-Text
Keywords: ultrahigh molecular weight polyethylene fibers; radiation induced graft polymerization; glycidyl methacrylate; phosphate group; removal of uranium from carbonate solution ultrahigh molecular weight polyethylene fibers; radiation induced graft polymerization; glycidyl methacrylate; phosphate group; removal of uranium from carbonate solution
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Li, R.; Li, Y.; Zhang, M.; Xing, Z.; Ma, H.; Wu, G. Phosphate-Based Ultrahigh Molecular Weight Polyethylene Fibers for Efficient Removal of Uranium from Carbonate Solution Containing Fluoride Ions. Molecules 2018, 23, 1245.

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