Nanostructured potassium copper hexacyanoferrate-cellulose hydrogel for selective and rapid cesium adsorption
Nanostructured potassium copper hexacyanoferrate-cellulose hydrogel for selective and rapid cesium adsorption
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DOI：
10.1016/j.cej.2016.10.136
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发表时间：
2017-04-01
影响因子：
15.1
通讯作者：
Lee, Jae W.
中科院分区：
文献类型：
--
作者：
Kim, Yonghwan;Kim, Yun Kon;Lee, Jae W.
合成了六氰合铁酸铜钾（KCuHCF），并将其固定在由羧甲基纤维素（CMC）和羟乙基纤维素（HEC）组成的纤维素基水凝胶中，用于吸附水溶液中的铯离子。与纤维素基水凝胶的固定化促进了纳米尺寸的KCuHCF颗粒的分散，显示出前所未有的吸附能力的复合材料。在Cs+去除实验中，KCuHCF-纤维素水凝胶复合材料（HCF-凝胶）表现出优异的Cs+吸附容量（2.06-2.32 mmol g（-1）），这归因于纤维素水凝胶中存在离子交换位点（COO-Na+）。HCF-凝胶也表现出快速的Cs+去除（90.1%去除0.15 mmol L-1的Cs+在1小时内）的吸收反应动力学表示的伪二级动力学模型。值得注意的是，在含有0.11 mmol L-1 Cs+的海水中，HCF凝胶可以选择性地吸附Cs+（> 90%）。这种具有快速动力学的特异性是由于水凝胶的固有性质和复合材料中高度分散的KCuHCF纳米颗粒的高离子可及性。(C)2016爱思唯尔B. V.保留所有权利。
Potassium copper hexacyanoferrate (KCuHCF) was synthesized and immobilized in a cellulose-based hydrogel made of carboxymethyl cellulose (CMC) and hydroxyethyl cellulose (HEC) for the adsorption of cesium ions in aqueous solutions. The immobilization with the cellulose-based hydrogel facilitated the dispersion of nano-sized KCuHCF particles, showing the unprecedented adsorption capacity of the composite. In Cs+ removal experiments, KCuHCF-cellulose hydrogel composites (HCF-gels) exhibited exceptional Cs+ adsorption capacities (2.06-2.32 mmol g(-1)) which was attributed to the presence of ion-exchangeable sites (COO-Na+) in the cellulose hydrogel. The HCF-gels also exhibited a rapid Cs+ removal (90.1% removal for 0.15 mmol L-1 of Cs+ in 1 h) with the uptake reaction kinetics expressed by a pseudo-second order kinetics model. Notably, the HCF-gels could adsorb Cs+ selectively (> 90%) in seawater containing 0.11 mmol L-1 Cs+. Such specificity with fast kinetics is due to the high ion accessibility from the inherent nature of hydrogels and the highly dispersed KCuHCF nanoparticles in the composites. (C) 2016 Elsevier B.V. All rights reserved.