Selective Preconcentration of U(VI) and Th(IV) in Trace and Macroscopic Levels Using Malonamide Grafted Polymer from Acidic Matrices
Selective Preconcentration of U(VI) and Th(IV) in Trace and Macroscopic Levels Using Malonamide Grafted Polymer from Acidic Matrices
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DOI：
10.1007/s00604-005-0373-0
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发表时间：
2005-06
影响因子：
5.7
通讯作者：
Chinthalapati Siva Kesava Raju;M. S. Subramanian
中科院分区：
文献类型：
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作者：
Chinthalapati Siva Kesava Raju;M. S. Subramanian
以N，N,N ',N ' -四己基丙二胺为原料，对Merrifield氯甲基化树脂进行改性，制备了一种用于从高酸性废水中选择性提取U（VI）和Th（IV）的新型高分子吸附剂。通过FT-IR、CPMAS NMR、CHN元素分析和热重分析对树脂进行了表征。采用静态和动态两种方法研究了用于金属离子定量提取的各种理化参数。该树脂对U（VI）和Th（IV）的吸附量分别为0.645和0.558 mmol g−1，具有较快的交换速率（可在20 min内饱和）和较高的吸附量（0.01 ~ 10 M）。用0.5 M (NH4) 2co3对两种分析物进行定量金属解吸。该树脂的显著特点是可以进行顺序分离，并且能够仅用水洗脱U(VI)，从而为U（VI）和Th（IV）的顺序分离提供了可能。对常见的金属离子、稀土离子和电解质进行了干扰研究。两种分析物的富集因子分别为400和350，定量限分别为20 ng mL - 1和50 ng mL - 1。所有分析数据的RSD均在3.8%以内，反映了方法的重现性和可靠性。
A novel polymeric sorbent for selective extraction of U(VI) and Th(IV) from highly acidic wastes was prepared by modifying Merrifield chloromethylated resin withN,N,N′,N′-tetrahexylmalonamide. The functionalized resin was characterized by FT-IR spectroscopy, CPMAS NMR spectroscopy, CHN elemental analysis and thermo-gravimetric analysis. Various physiochemical parameters responsible for quantitative extraction of metal ions were studied by static and dynamic methods. The resin exhibited very good extractability over a wide range of acidity (0.01–10 M) with a faster exchange rate (saturation possible within 20 min) and high sorption capacities (0.645 and 0.558 mmol g−1) for U(VI) and Th(IV), respectively. Quantitative metal desorption was achieved by using 0.5 M (NH4)2CO3for both analytes. The significant feature of the resin is the possibility of sequential separation and the ability to elute only U(VI) with water, thus offering the possibility of sequential separation of U(VI) and Th(IV). Interference studies with commonly encountered metal ions, rare earth ions and electrolytes were conducted. Enrichment factors of 400 and 350 with a limit of quantification of 20 ng mL−1and 50 ng mL−1were achieved for the two analytes. All the analytical data were within 3.8% RSD, reflecting the reproducibility and reliability of the method.