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用于增强从水溶液中去除铯（I）和锶（II）的海藻酸钠-聚乙烯亚胺珠粒的膦酸化

Phosphonation of Alginate-Polyethyleneimine Beads for the Enhanced Removal of Cs(I) and Sr(II) from Aqueous Solutions.

作者信息

Salih Khalid A M, Zhou Kanggen, Hamza Mohammed F, Mira Hamed, Wei Yuezhou, Ning Shunyan, Guibal Eric, Salem Waheed M

机构信息

School of Metallurgy and Environment, Central South University, Changsha 410083, China.

School of Nuclear Science and Technology, University of South China, Hengyang 421001, China.

出版信息

Gels. 2023 Feb 11;9(2):152. doi: 10.3390/gels9020152.

DOI:10.3390/gels9020152
PMID:36826322
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9957171/
Abstract

Although Cs(I) and Sr(II) are not strategic and hazardous metal ions, their recovery from aqueous solutions is of great concern for the nuclear industry. The objective of this work consists of designing a new sorbent for the simultaneous recovery of these metals with selectivity against other metals. The strategy is based on the functionalization of algal/polyethyleneimine hydrogel beads by phosphonation. The materials are characterized by textural, thermo-degradation, FTIR, elemental, titration, and SEM-EDX analyses to confirm the chemical modification. To evaluate the validity of this modification, the sorption of Cs(I) and Sr(II) is compared with pristine support under different operating conditions: the pH effect, kinetics, and isotherms are investigated in mono-component and binary solutions, before investigating the selectivity (against competitor metals) and the possibility to reuse the sorbent. The functionalized sorbent shows a preference for Sr(II), enhanced sorption capacities, a higher stability at recycling, and greater selectivity against alkali, alkaline-earth, and heavy metal ions. Finally, the sorption properties are compared for Cs(I) and Sr(II) removal in a complex solution (seawater sample). The combination of these results confirms the superiority of phosphonated sorbent over pristine support with promising performances to be further evaluated with effluents containing radionuclides.

摘要

虽然铯（I）和锶（II）并非战略性和有害金属离子，但从水溶液中回收它们对核工业而言至关重要。这项工作的目标是设计一种新型吸附剂，用于同时回收这些金属，并对其他金属具有选择性。该策略基于通过膦酸化对藻类/聚乙烯亚胺水凝胶珠进行功能化。通过结构、热降解、傅里叶变换红外光谱（FTIR）、元素分析、滴定以及扫描电子显微镜 - 能谱分析（SEM - EDX）对材料进行表征，以确认化学改性。为评估这种改性的有效性，在不同操作条件下将铯（I）和锶（II）的吸附与原始载体进行比较：在研究选择性（针对竞争金属）和吸附剂再利用可能性之前，在单组分和二元溶液中研究了pH效应、动力学和等温线。功能化吸附剂对锶（II）表现出偏好，具有增强的吸附容量、更高的循环稳定性以及对碱金属、碱土金属和重金属离子的更高选择性。最后，比较了在复杂溶液（海水样品）中去除铯（I）和锶（II）的吸附性能。这些结果的综合证实了膦酸化吸附剂相对于原始载体的优越性，其具有有前景的性能，有待进一步用含放射性核素的废水进行评估。

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