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首页> 外文期刊>RSC Advances >Amino-functionalized magnetic chitosan beads to enhance immobilization of potassium copper hexacyanoferrate for selective Cs+ removal and facile recovery
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Amino-functionalized magnetic chitosan beads to enhance immobilization of potassium copper hexacyanoferrate for selective Cs+ removal and facile recovery

机译：氨基官能化的壳聚糖磁珠可增强六氰合铁酸钾铜的固定化，以选择性去除Cs +和轻松回收

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摘要

Potassium copper hexacyanoferrate (KCuHCF)-incorporated magnetic chitosan beads (HMC) were synthesized for both selective Cs ~(+) removal in aqueous solutions and facile recovery of the spent adsorbent. To disperse and immobilize large amounts of the KCuHCF, methyl acrylate and diethylenetriamine were sequentially grafted onto the one-step synthesized magnetic chitosan beads. The additional introduction of amino functionality led to the enriched Cu ~(2+) ions on the bead surface to incorporate KCuHCF into the grafting matrix. Consequently, the HMC exhibited a high Cs ~(+) capacity calculated to be 136.47 mg g ~(?1) from the Langmuir model, and the equilibrium was established within 4 h. Moreover, the HMC exhibited excellent stability in a wide pH range from 4 to 11 and an outstanding Cs ~(+) selectivity (>97%) in seawater (1.11 mg L ~(?1) Cs ~(+) ). From a practical point of view, the HMC was stable during five successive adsorption cycles and easily recovered by magnets, enabling continuous operation to decontaminate a large volume of wastewater.
机译：合成了六氰合高铁酸钾铜（KCuHCF）结合的磁性壳聚糖珠（HMC），用于水溶液中的选择性Cs〜（+）去除和轻度回收废吸附剂。为了分散和固定大量的KCuHCF，将丙烯酸甲酯和二亚乙基三胺顺序接枝到一步合成的磁性壳聚糖磁珠上。氨基官能团的额外引入导致珠表面上富集的Cu〜（2+）离子将KCuHCF引入接枝基质中。因此，HMC表现出高的Cs〜（+）容量（根据Langmuir模型计算为136.47 mg g〜（？1）），并且在4小时内建立了平衡。此外，HMC在4至11的宽pH范围内均表现出优异的稳定性，并且在海水（1.11 mg L〜（？1）Cs〜（+））中具有出色的Cs〜（+）选择性（> 97％）。从实用的角度来看，HMC在五个连续的吸附循环中保持稳定，并且很容易被磁铁回收，从而能够连续运行以净化大量废水。

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