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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater
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A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater

机译：衍生自丙烯酸纤维的高效铀涂布器，用于从海水中提取铀

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摘要

Acrylic fiber can be chemically converted to an amidoxime and carboxylate containing chelating adsorbent by a two-step synthesis method for extraction of uranium from seawater. A portion of the nitrile groups in the fiber is first converted to amidoxime using hydroxylamine followed by conversion of another portion of the nitrile groups to carboxylate with NaOH. At an optimized ratio of amidoxime/carboxylate (about 1 : 1), the chelating fiber in real seawater shows a higher uranium adsorption capacity and shorter saturation time compared with similar high-surface-area chelating fibers developed recently using a radiation-induced grafting method. The saturation capacity of uranium is estimated to be 7.73 grams per kilogram of the adsorbent at 20 degrees C and the half-saturation time is about 15.7 days. The fiber shows a vanadium/uranium ratio of about 1 in real seawater tests. The low vanadium adsorption capacity of the fiber is attributed to the branched-chain amidoxime groups formed by the specified amidoximation process. This simple and low-cost synthesis method can be scaled up to mass produce the chelating fiber for recovering metals from various aquatic environments including production of uranium from seawater.
机译：丙烯酸纤维可以通过两步合成方法将含偕胺肟和羧酸酯化学转化为含偕胺肟和羧酸盐，用于从海水中萃取铀的两步合成方法。首先使用羟胺将纤维中的腈基的一部分腈基转化为偕胺肟，然后将另一部分腈基转化为与NaOH的羧酸盐。以偕胺肟/羧酸盐（约1：1）的优化比例，实际海水中的螯合纤维显示出更高的铀吸附能力和较短的饱和时间与最近使用辐射诱导的嫁接方法开发的类似的高表面积螯合纤维相比。铀的饱和容量估计为每千克吸附剂在20摄氏度下为7.73克，半饱和时间约为15.7天。纤维在真正的海水测试中显示出约1的钒/铀比。纤维的低钒吸附能力归因于通过规定的酰胺氧化过程形成的支链偕胺肟基团。这种简单且低成本的合成方法可以缩放到质量产生螯合纤维，用于从各种水生环境中回收金属，包括来自海水的铀。

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