Phosphate-Based Ultrahigh Molecular Weight Polyethylene Fibers for Efficient Removal of Uranium from Carbonate Solution Containing Fluoride Ions.
Phosphate-Based Ultrahigh Molecular Weight Polyethylene Fibers for Efficient Removal of Uranium from Carbonate Solution Containing Fluoride Ions.
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磷酸盐基超高分子量聚乙烯纤维可有效去除含氟离子碳酸盐溶液中的铀
DOI：
10.3390/molecules23061245
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发表时间：
2018-05-23
期刊：
影响因子：
--
通讯作者：
Wu G
中科院分区：
文献类型：
--
作者：
Li R;Li Y;Zhang M;Xing Z;Ma H;Wu G
这项工作为制备用于从含NaF的碳酸盐溶液中去除铀(U(VI))的功能性聚合物纤维提供了一种经济有效的方法。采用甲基丙烯酸缩水甘油酯接枝、磷酸开环反应制备了磷酸基超高相对分子质量聚乙烯(UHMWPE-g-PO4)纤维。UHMWPE-g-PO4纤维对铀(VI)的吸附能力依赖于磷酸根密度(dpo，∙g−1)。DPO为2.01mmoL∙g−1的UHMWPE-g-PO4纤维在没有NaF存在的情况下，从Na2CO3溶液中去除99.5%的U(VI)。此外，当NaF浓度为3g∙L−1时，U(VI)的去除效果仍能达到92%。吸附过程符合准二级动力学和Langmuir等温线模型。实验测得UHMWPE-g-PO4纤维对铀(VI)的最大吸附容量(Qmax)达到110.7 mg∙g−1，与朗缪尔方程计算的Qmax(117.1 mg∙g−1)接近。与F-−相比，Cl-−、NO_3-−和SO_4-−对U(VI)的去除效果不明显，但H_2PO_4-−和CO_3-−显著降低U(VI)的去除效果，其顺序为F-−>；H_2PO_4-−&G_(32)−。循环U(VI)吸附-解吸实验表明，UHMWPE-g-PO4纤维是可重复使用的。这些结果支持了UHMWPE-g-PO4纤维可以有效地去除碳酸盐溶液中的铀(VI)。
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.
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