Efficient removal of uranium (VI) from aqueous solution by functionalized plate-like covalent organic frameworks

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-01-29 DOI:10.1007/s10967-024-09968-8

Jiahu Zhang, Dechun Liu, Jiyao Hu, Zhong Chen

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引用次数: 0

Abstract

A novel plate-like covalent organic framework (COF) adsorbent (AO-MA-ATA) was synthesized via a series of thermochemical methods using amidoxime-functionalized 2-aminoterephthalic acid (H₂ATA)-melamine (MA) and applied for the removal of radioactive uranium U(VI) under neutral aqueous conditions. The prepared materials were characterized using spectroscopic, X-ray, and microscopic imaging techniques, which confirmed the plate-like structure of the AO-MA-ATA COFs. Kinetic analysis indicated that U(VI) adsorption onto AO-MA-ATA followed a second-order model. The isothermal adsorption of U(VI) could be described by the Langmuir isotherm model, with a maximum adsorption capacity of 1111.1 mg g⁻¹ at 318 K and pH 7. Evaluation of the thermodynamic parameters showed that U(VI) adsorption by AO-MA-ATA was a spontaneous and exothermic process. The adsorption mechanism mainly involved chelation, rather than covalent bonding. Overall, the results presented herein indicate that AO-MA-ATA COFs can effectively remove U(VI) from aqueous solutions and are therefore promising candidates for treating uranium-containing wastewater.

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功能化板状共价有机骨架对水溶液中铀（VI）的高效去除

以偕胺肟功能化的2-氨基对苯二甲酸(H2ATA)-三聚氰胺（MA）为原料，通过一系列热化学方法合成了一种新型板状共价有机骨架（COF）吸附剂（AO-MA-ATA），并应用于中性水环境下对放射性铀U（VI）的去除。利用光谱、x射线和显微成像技术对制备的材料进行了表征，证实了AO-MA-ATA COFs具有板状结构。动力学分析表明，AO-MA-ATA对U（VI）的吸附符合二级模型。U（VI）的等温吸附符合Langmuir等温吸附模型，在318k和ph7条件下，U（VI）的最大吸附量为1111.1 mg g−1。热力学参数评价表明，AO-MA-ATA吸附U（VI）是一个自发的放热过程。吸附机制主要是螯合作用，而不是共价键作用。总体而言，本文的结果表明，AO-MA-ATA COFs可以有效地去除水溶液中的U(VI)，因此是处理含铀废水的有希望的候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.