Solvent-assisted synthesis of potassium copper hexacyanoferrate embedded 3D-interconnected porous hydrogel for highly selective and rapid cesium ion removal
Solvent-assisted synthesis of potassium copper hexacyanoferrate embedded 3D-interconnected porous hydrogel for highly selective and rapid cesium ion removal
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DOI：
10.1016/j.jece.2017.01.026
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发表时间：
2017-02-01
影响因子：
7.7
通讯作者：
Lee, Jae W.
中科院分区：
文献类型：
--
作者：
Kim, Yun Kon;Kim, Yonghwan;Lee, Jae W.
采用两步法制备了铁氰化钾铜包埋的聚乙烯醇-柠檬酸水凝胶膜（HPC）。在预形成的水凝胶中的扩散衍生的KCuHCF形成促进了3D互连的水凝胶结构的保存和KCuHCF纳米颗粒的分散。使用丙酮作为非溶剂，掺入的Cu在水凝胶基质中的反向扩散受到阻碍;因此大量的KCuHCF负载在基质中。HPC在吸附容量、动力学和选择性方面表现出显著增强的Cs+去除性能。从吸附等温线，HPC表现出非常高的Cs+吸收667 mg/g KCuHCF。此外，吸附剂显示稳定和高Cs+去除效率为99.9%，在很宽的pH范围从2到10。Cs+去除的动力学是非常迅速的，从稀Cs+溶液（9.18 ppm）中在30分钟内达到99.5%的去除率。当使用海水时，HPC表现出几乎不变的Cs+去除效率高于99.5%，并且在极低的Cs+浓度（0.67 ppm，V/m = 1000 ml/g）下具有7.7 × 10（5）ml/g的高分配系数K-d值，这突出了对Cs+的巨大亲和力。(C)2017爱思唯尔有限公司版权所有
Potassium copper hexacyanoferrate-embedded poly( vinyl alcohol)-citric acid hydrogel film ( HPC) was prepared via a two-step method of Cu immobilization, followed by the diffusion of potassium hexacyanoferrate accelerated by acetone evaporation. The diffusion-derived KCuHCF formation in the preformed hydrogel facilitated the preservation of the 3D-interconnected hydrogel structure and dispersion of the KCuHCF nanoparticles. Using acetone as a non-solvent, reverse diffusion of the incorporated Cu in the hydrogel matrix was hindered; hence a large amount of KCuHCF was loaded in the matrix. The HPC exhibited substantially enhanced Cs+ removal properties in terms of adsorption capacity, kinetics and selectivity. From the adsorption isotherm, the HPC showed a very high Cs+ uptake of 667 mg/g KCuHCF. Moreover, the adsorbent revealed stable and high Cs+ removal efficiency of 99.9% across a wide pH range from 2 to 10. The kinetics of Cs+ removal was remarkably rapid with 99.5% removal achieved within 30 min from a dilute Cs+ solution ( 9.18 ppm). When using seawater, the HPC exhibited almost unaltered Cs+ removal efficiency above 99.5%, and high distribution coefficient K-d value of 7.7 x 10(5) ml/g at an extremely low Cs+ concentration ( 0.67 ppm, V/m = 1000 ml/g), which highlighted the tremendous affinity for Cs+. (C) 2017 Elsevier Ltd. All rights reserved.