Comparative study of the factors associated with the application of metal hexacyanoferrates for environmental Cs decontamination
Comparative study of the factors associated with the application of metal hexacyanoferrates for environmental Cs decontamination
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DOI：
10.1016/j.cej.2015.08.076
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发表时间：
2016-01-01
影响因子：
15.1
通讯作者：
Kawamoto, Tohru
中科院分区：
文献类型：
--
作者：
Parajuli, Durga;Takahashi, Akira;Kawamoto, Tohru
制备了海藻酸钙凝聚铁氰化铜（CuHCF）和铁氰化铁（FeHCF）微球，并研究了其对环境铯的净化能力。温度和溶液pH值的影响，这是有效的去污的关键参数进行了详细研究。在不同温度下进行的动力学研究表明，Cs到CuHCF上的吸附速度比FeHCF快，观察到的差异主要是由于材料的吸附容量的差异。此外，一个重要的环境问题，这是经常被忽略的，释放的亚铁氰化物离子到流出液中的可能性，进行了详细讨论。通过FeHCF的流出液中总氰化物的浓度相对非常高，超过pH 4。相反，其低于在pH低于4的CuHCF通过的溶液中。基于这些结果，FeHCF在高酸性溶液中是一个很好的选择，对于弱酸性至弱碱性pH，CuHCF是有效的。(C)2015 Elsevier B.V.版权所有。
Calcium alginate cohered beads of copper hexacyanoferrate (CuHCF), and iron hexacyanoferrate (FeHCF), were prepared and studied for their competence in the environmental Cs decontamination. The influence of temperature and solution pH, parameters which are crucial for effective decontamination are studied in detail. Kinetic study performed at varying temperatures showed that adsorption of Cs onto CuHCF is faster than on FeHCF, the difference observed mainly due to the difference in the adsorption capacities of the materials. Additionally, an important environmental issue, which is often omitted, the possibility of release of the ferrocyanide ion into the effluent solution, is discussed in detail. The concentration of total cyanide in the effluent solution passed through FeHCF is comparatively very high beyond pH 4. In contrary, it is lower than in CuHCF passed solution at pH below 4. Based on these results, FeHCF is a good option in highly acidic solutions, and for weakly acidic to slightly alkaline pH, CuHCF is effective. (C) 2015 Elsevier B.V. All rights reserved.