Adsorption of Uranium (VI) from Copper solution using Varion-AP and A500 resins: Kinetics and isotherm study

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2025-02-21 DOI:10.1016/j.molstruc.2025.141830

Amirhossein Wizan , Davood Ghoddocynejad , Mohammad Outokesh , Seyed Mohammad Davachi

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Abstract

This study investigates the adsorption of uranium (VI) using Varion-AP and Purolite A500 resins. These two resins offer significant advantages due to their high adsorption capacity, selectivity, reusability, ease of use, and environmental compatibility. The main objective of this study was to examine the equilibrium. Batch experiments were designed and conducted with varying solution volumes (50–300 mL) and resin. The effects of pH (2.25–4.25), contact time (up to 4 h), and different resin dosages on the adsorption efficiency were studied, and the optimal adsorption was observed at pH 3.25. The Langmuir and Freundlich isotherm models were employed to analyze the equilibrium data at a constant temperature (25 °C) and to determine the adsorption capacity. The adsorption kinetics followed a pseudo-second-order model. The maximum adsorption capacity of Varion-AP and A500 for uranium (VI) was found to be 67.5 mg/g and 51.5 mg/g, respectively. Desorption experiments at different temperatures (25 °C, 40 °C, and 60 °C) revealed optimal desorption points of 480 mg/lit and 400 mg/lit for Varion-AP and A500 resins, respectively. These results suggest the potential of both resins for uranium (VI) recovery.

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Varion-AP和A500树脂对铜溶液中铀（ⅵ）的吸附动力学和等温研究

研究了Varion-AP和Purolite A500树脂对铀（ⅵ）的吸附作用。这两种树脂由于其高吸附能力，选择性，可重复使用，易用性和环境相容性而具有显着优势。本研究的主要目的是检验平衡。设计并进行了不同溶液体积（50-300 mL）和树脂的批量实验。考察了pH（2.25 ~ 4.25）、接触时间（最长4 h）和不同树脂用量对吸附效率的影响，以pH为3.25时吸附效果最佳。采用Langmuir和Freundlich等温线模型分析了恒温（25℃）下的平衡数据，并确定了吸附量。吸附动力学服从准二阶模型。Varion-AP和A500对铀（VI）的最大吸附量分别为67.5 mg/g和51.5 mg/g。在不同温度（25°C、40°C和60°C）下的解吸实验表明，Varion-AP和A500树脂的最佳解吸点分别为480 mg/lit和400 mg/lit。这些结果表明了这两种树脂回收铀（VI）的潜力。

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 Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.