聚乙烯亚胺凝胶涂层二氧化硅。高铀容量和快速动力学的凝胶包覆树脂

M. Chanda , G.L. Rempel
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引用次数: 50

摘要

研究了以预载Cu(II)为主离子,戊二醛为交联剂,在高比表面积二氧化硅上以弱碱性树脂聚乙烯亚胺(PEI)为薄层凝胶包覆二氧化硅的新工艺,然后用酸浸法去除主离子。发现与戊二醛反应引入的>NCH(OH)基团对U和Fe的吸附都有促进作用,但对后者的作用相对更明显。发现凝胶包覆PEI树脂的ON摩尔比为0.70时对U的吸附效果最佳。在pH值为4-5的UO2SO4的稀水溶液(0.1-0.4 mM)中,凝胶包覆树脂的U吸附能力比传统的珠状树脂Dowex-1X8高几倍。然而,含有大量低容量二氧化硅的树脂包覆二氧化硅吸附剂的容量仅在低溶液浓度下与珠状Dowex树脂的容量相当。与珠状Dowex树脂相比,凝胶包覆树脂也表现出明显更快的吸附平衡速率,吸附动力学受扩散控制,分布系数和有效扩散系数的乘积高达8.4 × 10−6 cm2/s。用2n H2SO4将吸附的U从凝胶包覆的吸附剂中剥离出来几乎是瞬间的。
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Polyethyleneimine gel-coat on silica. High uranium capacity and fast kinetics of gel-coated resin

A new process has been developed for gel-coating a weak-base resin polyethyleneimine (PEI) as a thin layer on high surface area silica using preloaded Cu(II) as the host ion on silica and glutaraldehyde as the cross-linking agent, followed by removal of the host ion by leaching with acid. The >NCH(OH) group introduced by the reaction with glutaraldehyde is found to enhance both U and Fe sorption, the effect, however, being relatively more pronounced on the latter. An ON mole ratio ∼0.70 of the gel-coated PEI resin is found to be optimum for U sorption. In U sorption from dilute (0.1–0.4 mM) aqueous solutions of UO2SO4 at pH 4–5, the gel-coated resin exhibits several times higher capacity than a conventional bead-form resin Dowex-1X8. However, the capacity of the resin-coated silica sorbent, containing a large percentage of low-capacity silica, is only comparable to that of the bead-form Dowex resin at low solution concentrations. The gel-coated resin also exhibits a significantly faster rate of attainment of equilibrium sorption as compared to the bead-form Dowex resin, the sorption kinetics being diffusion-controlled with a high value of 8.4 × 10−6 cm2/s for the product of distribution coefficient and effective diffusivity. The stripping of the sorbed U from the gel-coated sorbent with 2 N H2SO4 is nearly instantaneous.

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