Roh Hyelin, Kim Yonghwan, Kim Yun Kon, Harbottle David, Lee Jae W
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Republic of Korea
School of Chemical and Process Engineering, University of Leeds Leeds LS2 9JT UK.
RSC Adv. 2019 Jan 9;9(2):1106-1114. doi: 10.1039/c8ra09386e. eCollection 2019 Jan 2.
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 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 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 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.
合成了负载铁氰化铜钾（KCuHCF）的磁性壳聚糖珠（HMC），用于水溶液中铯的选择性去除和废吸附剂的简便回收。为了分散和固定大量的KCuHCF，将丙烯酸甲酯和二亚乙基三胺依次接枝到一步合成的磁性壳聚糖珠上。氨基官能团的额外引入导致珠表面富集铜离子，从而将KCuHCF纳入接枝基质中。因此，根据朗缪尔模型计算，HMC对铯的吸附容量高达136.47 mg/g，且在4小时内达到平衡。此外，HMC在4至11的宽pH范围内表现出优异的稳定性，在海水中（铯含量为1.11 mg/L）对铯具有出色的选择性（>97%）。从实际应用角度来看，HMC在连续五个吸附循环中保持稳定，并且通过磁铁易于回收，能够连续运行以净化大量废水。
