一种新型四齿双吡啶双（吡唑）配体在Eu3+上从HNO3溶液中高效选择性萃取Am3+

IF 1.8 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Solvent Extraction and Ion Exchange Pub Date : 2023-02-15 DOI:10.1080/07366299.2023.2173014

Lianjun Song, Xueyu Wang, Long Li, Zhuang Wang, Lanlan He, Qiuju Li, Qingjiang Pan, Songdong Ding

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引用次数: 0

摘要

摘要研究了6,6′-双(5-烷基- 1h -吡唑-3-基)-2,2′-联吡啶(BPzBPy, alkyl = i-Bu, n-Bu, n-Oct)从HNO3介质中萃取Am3+和Eu3+的工艺及BPzBPy与Eu3+的络合反应。以间硝基苯并三氟(F-3)为稀释剂，iBu-BPzBPy配体与2-溴己酸结合，可在Eu3+上提取Am3+，萃取效率显著高，萃取动力学较快，易溶出。斜率分析表明形成了1:2的金属/配体萃取物。电喷雾电离质谱(ESI-MS)、傅里叶变换红外光谱(FT-IR)和时间分辨激光荧光光谱(TRLFS)分析表明，萃取物的组成为[Eu(H2O)L2]A3 (L =配体;HA = 2-溴己酸)。iBu-BPzBPy配体与Eu3+的络合是一个焓驱动的自发、放热、熵降低的过程。并通过紫外-可见分光光度法测定了配合物的稳定性常数。结合溶剂萃取和络合研究的结果，提出了阳离子交换萃取模型。图形抽象

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A Novel Type of Tetradentate Dipyridyl-Derived Bis(pyrazole) Ligands for Highly Efficient and Selective Extraction of Am3+ Over Eu3+ From HNO3 Solution

ABSTRACT The extraction of Am3+ and Eu3+ with 6,6’-bis(5-alkyl-1H-pyrazol-3-yl)-2,2’-bipyridine (BPzBPy, alkyl = i-Bu, n-Bu, n-Oct) from HNO3 medium and the complexation of BPzBPy with Eu3+ were investigated. By using meta-nitrobenzotrifluoride (F-3) as a diluent, iBu-BPzBPy ligand in combination with 2-bromohexanoic acid was able to extract Am3+ over Eu3+ with the nature of significantly high efficiency, relatively fast extraction kinetics, and easy stripping. Slope analysis showed the formation of a 1:2 metal/ligand extraction species. The analyses of electrospray ionization mass spectrometry (ESI-MS), Fourier transform infrared (FT-IR) and time-resolved laser fluorescence spectrum (TRLFS) revealed that the composition of the extracted complex was [Eu(H2O)L2]A3 (L = ligand; HA = 2-bromohexanoic acid). The complexation of iBu-BPzBPy ligand with Eu3+ was an enthalpy-driven spontaneous, exothermic, and entropy-decreasing process. Besides, the complex stability constants were also obtained via UV–vis spectrophotometric titration. Combining the results of solvent extraction and complexation studies, a cation exchange extraction model was also proposed. GRAPHICAL ABSTRACT

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来源期刊

Solvent Extraction and Ion Exchange 化学-化学综合

CiteScore

4.40

自引率

5.00%

发文量

审稿时长

8.4 months

期刊介绍： Solvent Extraction and Ion Exchange is an international journal that publishes original research papers, reviews, and notes that address all aspects of solvent extraction, ion exchange, and closely related methods involving, for example, liquid membranes, extraction chromatography, supercritical fluids, ionic liquids, microfluidics, and adsorption. We welcome submissions that look at: The underlying principles in solvent extraction and ion exchange; Solvent extraction and ion exchange process development; New materials or reagents, their syntheses and properties; Computational methods of molecular design and simulation; Advances in equipment, fluid dynamics, and engineering; Interfacial phenomena, kinetics, and coalescence; Spectroscopic and diffraction analysis of structure and dynamics; Host-guest chemistry, ion receptors, and molecular recognition.