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首页> 美国卫生研究院文献>Polymers >Adsorption of Ethylenediaminetetraacetic Acid on a Gel-Type Ion-Exchange Resin for Purification of Liquid Waste Containing Cs Ions
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Adsorption of Ethylenediaminetetraacetic Acid on a Gel-Type Ion-Exchange Resin for Purification of Liquid Waste Containing Cs Ions

机译：凝胶型离子交换树脂对乙二胺四乙酸的吸附，纯化含铯离子废液

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摘要

Because of its excellent chelating property, ethylenediaminetetraacetic acid (EDTA) is used as a complex agent, not only for heavy metals, but also for radioactive isotopes during the decontamination of nuclear facilities. The removal of EDTA was investigated by adsorption with commercially available, gel-type, anion-exchange resins (AERs), which are based on cross-linked polystyrene with positive tertiary amine groups. Because of the positive charge on AERs, they could adsorb EDTA effectively even in a solution mixed with ions of cesium (Cs) via electrostatic attraction. Because EDTA adsorption by cation-exchange resins (CERs) was not possible, it was concluded that the negative charges on CERs do not contribute to the interaction with EDTA. The maximum adsorption capacity (qmax) of AER (2 g/L) for EDTA removal, calculated by the Langmuir isotherm model was 0.47 mmol/g for initial EDTA concentrations in the range of 0.01–1 mM in the EDTA/Cs mixed solution. The Langmuir isotherm model was found to be suitable for EDTA adsorption on AERs, indicative of monolayer adsorption. The results clearly suggested that the AERs could efficiently remove EDTA, regardless of the presence of nuclides, such as Cs ions in the aqueous solution.
机译：乙二胺四乙酸（EDTA）由于其出色的螯合性能，不仅在重金属中用作络合剂，而且在核设施的净化过程中也用作放射性同位素。通过用市售的凝胶型阴离子交换树脂（AER）吸附来研究EDTA的去除，该树脂基于具有正叔胺基团的交联聚苯乙烯。由于AER上带有正电荷，因此即使在通过静电吸引与铯（Cs）离子混合的溶液中，它们也可以有效地吸附EDTA。由于不可能通过阳离子交换树脂（CER）吸附EDTA，因此可以得出结论，CER上的负电荷不会促进与EDTA的相互作用。由Langmuir等温模型计算得出，对于EDTA / Cs混合溶液中初始EDTA浓度为0.01-1 mM的AER（2 g / L），最大吸附容量（qmax）为0.47 mmol / g。发现Langmuir等温线模型适用于AER上的EDTA吸附，表明单层吸附。结果清楚地表明，无论水溶液中是否存在诸如Cs离子之类的核素，AER都能有效去除EDTA。

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