Separation of thorium using new solvent extractant derived from recycling discarded plastic bottles

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-07-12 DOI:10.1016/j.hydromet.2025.106533

Ahmed Orabi , Hend Salem , Nagwa Falila , Doaa Ismaiel , Magd Badr

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引用次数: 0

Abstract

Due to the non-biodegradable nature of plastic bottle waste, this work offers a method to recycle this waste by converting it into a valuable and efficient extractor for thorium separation from spent ore. A new promising extractant (Rec-UPEST) was successfully synthesized based on the glycolysis of plastic bottle waste by utilizing a mixture of glycerol and diethylene glycol, followed by esterification using the natural fatty acid of linolenic acid. Several characterizations, such as FTIR spectrometry, ¹H NMR analysis, and MS analysis, were performed to ensure its felicitous preparation. The produced material (Rec-UPEST) dissolved in CHCl₃ could extract Th(IV) efficiently with the maximum loading capacity of 1.08 g L⁻¹ at 15 min, organic to aqueous ratio = 1:1, T = 298 K, and pH = 2. Infrared data confirmed that the extraction was achieved by the bonding of the extractant to the thorium through glycol and ester oxygen atoms. The slope analysis technique inferred that Rec-UPEST has been able to extract Th as a complex with a 2:1 (Rec-UPEST: Th) molar ratio. In two stages, as shown by the resulting McCabe-Thiele diagrams, Th can be successfully extracted and stripped. Thermodynamic calculations showed that Rec-UPEST /Th extraction is an exothermic process. The stripping process of Th (99.8 %) was achieved using 2 mol L⁻¹ HNO₃. To compile all of the recovery steps of Th from the waste residue of the mineralized microgranite dike used in this research, a proposed flow diagram was created.

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利用回收废旧塑料瓶提取的新型溶剂萃取剂分离钍

由于塑料瓶废弃物的不可生物降解性，本工作提供了一种回收方法，将其转化为一种有价值的高效萃取剂，用于从废矿石中分离钍。利用甘油和二甘醇的混合物对塑料瓶废弃物进行糖酵解，然后利用天然脂肪酸亚麻酸进行酯化，成功合成了一种新的有前途的萃取剂（Rec-UPEST）。进行了一些表征，如FTIR光谱，1H NMR分析和MS分析，以确保其制备得当。制作材料(Rec-UPEST)溶解在CHCl3可以有效提取Th (IV)的最大装载量1.08 g L−1 15分钟,有机水比 = 1:1,T = 298 K, pH值 = 2。红外数据证实萃取剂是通过乙二醇和酯氧原子与钍键合而实现萃取的。斜率分析技术推断Rec-UPEST已经能够以2:1 （Rec-UPEST: Th）的摩尔比提取配合物Th。如所得的McCabe-Thiele图所示，可以通过两个阶段成功地提取和剥离Th。热力学计算表明，Rec-UPEST /Th萃取是一个放热过程。以2 mol L−1 HNO3为溶剂，实现了Th（99.8 %）的溶出。为编制本研究利用的矿化微花岗岩脉废渣中回收Th的所有步骤，建立了建议的流程图。

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

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.