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首页> 外文期刊>RSC Advances >Conversion of supramolecular organic framework to uranyl-organic coordination complex: a new “matrix-free” strategy for highly efficient capture of uranium
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Conversion of supramolecular organic framework to uranyl-organic coordination complex: a new “matrix-free” strategy for highly efficient capture of uranium

机译：超分子有机构架向铀酰-有机配位化合物的转化：一种新的“无基质”策略，用于高效捕获铀

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Herein, an innovative “matrix-free” strategy has been proposed for highly efficient uranium capture via uranyl-induced disassembly and reassembly of the two functional building blocks of the as-prepared hydrogen-bonded supramolecular organic framework (HSOF), which is composed of N-donor-containing melamine and O-donor-containing trimesic acid self-assembled through hydrogen bonding. The batch experimental results demonstrated that HSOF possesses excellent extraction capacity (qm = 444 mg g?1), >99% removal efficiency in the range of tested U(VI) concentration (20–130 ppm) with a considerably large KUd value of 1.3 × 107 mL g?1 at 130 ppm, and very fast extraction rate (<10 min) for UO22+. Especially, the uranium selectivity (SU = qe-U/qe-tol) of HSOF stays above 80% over the pH range tested in a uranium-containing solution with 11 competing cations, and distinctively, reaches the so far unreported 99% with a great capacity of 309 mg g?1 at pH 2.5. It is worth noting that a clear morphology transformation of HSOF nanowires to nanosheets of the uranyl-organic coordination complex (UOCC) after extraction has been observed only in the presence of uranyl ions. Moreover, according to experimental characterization and DFT studies, a possible mechanism for the efficient capture of uranium is proposed: the stronger coordination interaction among uranyl, TMA and MA could replace the weaker hydrogen-bond interaction originally linking the two building blocks in HSOF in the extraction process.
机译：本文提出了一种创新的“无基质”策略，用于通过铀酰诱导的组装和氢键结合的超分子有机框架的两个功能结构块高效地捕获铀。 HSOF），由通过氢键自组装的含N供体的三聚氰胺和含O供体的偏苯三酸组成。批处理实验结果表明，HSOF具有优异的提取能力（ q m = 444 mg g ？1 ），在测试的U（ VI ）浓度（20–130 ppm）范围内， K 的去除效率> 99％ U d 值为1.3×10 7 mL g < small> ？1 在130 ppm时，UO 2 <的提取速度非常快（<10分钟） sup> 2 + 。特别是铀的选择性（ S U = q eU < HSOF的/ small> / q e-tol ）在含11种竞争铀的含铀溶液中测试的pH范围内保持在80％以上迄今为止，阳离子的最大吸附量为309 mg g ？1 ，迄今尚未达到报告的99％。值得注意的是，仅在存在铀酰离子的情况下，才观察到提取后HSOF纳米线向铀酰-有机配位复合物（UOCC）纳米片的清晰形态转化。此外，根据实验表征和DFT研究，提出了一种有效捕集铀的可能机制：铀酰，TMA和MA之间较强的配位相互作用可以代替原先连接HSOF中两个结构单元的较弱的氢键相互作用。提取过程。

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