Carbon-based electroactive ion exchange materials: Ultrahigh removal efficiency and ion selectivity for rapid removal of Cs+ ions
Carbon-based electroactive ion exchange materials: Ultrahigh removal efficiency and ion selectivity for rapid removal of Cs+ ions
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碳基电活性离子交换材料：超高去除效率和离子选择性，快速去除Cs离子
DOI：
10.1016/j.seppur.2021.119056
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发表时间：
2021
影响因子：
8.6
通讯作者：
Guoqing Guan
中科院分区：
文献类型：
--
作者：
Yaqin Rong;Shuai Li;Junjian Niu;Zhongde Wang;Xiaogang Hao;Chengwen Song;Tonghua Wang;Guoqing Guan
放射性铯（137Cs）离子具有高能伽马辐射和较长的半衰期。当它们进入水体时，往往会产生严重的环境问题和对人体的危害。通过在煤基管状碳膜（CTCM）表面和内壁均匀沉积六氰高铁酸镍（NiHCF）纳米颗粒，制备了一种电活性复合膜，可快速、选择性地分离废水中的Cs+。该NiHCF合并CTCM管在长时间内具有极高的去除率（超过99.99%）。同时，即使在高共存离子浓度的溶液中（如Cs+:Na+= 1:99, Cs+:K+= 1:99），它也表现出极强的Cs+选择性。这种快速、选择性的Cs+吸收/释放可能是由于NiHCF纳米颗粒在CTCM管内对Cs+具有高选择性的分散，从而减小了传质距离，增加了流体湍流，加快了传质速率。这种含CTCM的NiHCF管有望成为分离放射性铯离子的一种有前途的替代材料。
Radioactive cesium (137Cs) ions exhibit high-energy gamma radiation and long half-life. When they enter water body, serious environmental problems and damage to the human body are always generated. Herein, an electroactive composite membrane was facilely prepared by uniformly deposition of nickel hexacyanoferrate (NiHCF) nanoparticles on the surface and inner wall of coal-based tubular carbon membrane (CTCM) for rapid and selective separation of Cs+from wastewater. This NiHCF incorporated CTCM tube exhibited an extremely high removal rate (over 99.99%) over a long period. Meanwhile, it also demonstrated extreme Cs+selectivities even in the solutions with high coexisting ion concentrations (e.g., Cs+:Na+= 1:99, Cs+:K+= 1:99). The rapid and selective Cs+uptake/release should be attributed to the better dispersion of NiHCF nanoparticles with high selectivity to Cs+in the CTCM tube, which reduced the mass transfer distance, increased fluid turbulence and accelerated mass transfer rate. It is expected that such a NiHCF incorporated CTCM tube could be a promising alternative of conventional materials for the separating of radioactive Cs+ions.