Abstract

Two glycolamide based functionalized ionic liquids (ILs) having imidazolium cations namely L_I (mono-ionic) and L_II (di-ionic) were synthesized for the extraction of Pb(II) and Co(II) from waste water. The synthesized ligands were characterized by FTIR and NMR spectroscopy. The extraction efficiency of both mono- and di-ionic liquids was evaluated in terms of contact time, pH of the aqueous phase and metal ion concentration. The metal extraction was carried out at various pH values viz. 2, 4, 6, 8, and 10 whereas, at contact time of 15, 30, 45, 60, and 75 minutes. The optimized pH of 4 and equilibration time of 75 minutes was further utilized for extraction at various metal ions concentration (50, 100, 150, 200, and 250 ppm). L_I exhibited low equilibration time as compared to L_II whereas, both ligands showed maximum extraction at a pH of 4. A very high extraction efficiency of up to 99% for both metals was observed with L_I and L_II under optimized conditions. In addition to that effective separation of Co(II) and Pb(II) was observed at pH 10.

中文翻译：

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基于二甘醇酰胺的具有咪唑鎓阳离子的单离子和双离子液体可有效萃取和分离 Pb(II) 和 Co(II)

摘要

合成了两种具有咪唑鎓阳离子的基于乙醇酰胺的官能化离子液体 (IL)，即 L _I（单离子）和 L _II（双离子），用于从废水中提取 Pb（II）和 Co（II）。通过FTIR和NMR光谱表征合成的配体。根据接触时间、水相的 pH 值和金属离子浓度来评估单离子和双离子液体的提取效率。金属萃取在不同的 pH 值下进行，即。2、4、6、8和10，而在15、30、45、60和75分钟的接触时间。优化的 pH 值为 4，平衡时间为 75 分钟，进一步用于在各种金属离子浓度（50、100、150、200 和 250 ppm）下进行萃取。大号_我与 L _II相比，平衡时间较短，而两种配体在 pH 值为 4 时均表现出最大提取率。在优化条件下，使用 L _I和 L _II观察到两种金属的提取效率高达 99% 。此外，在 pH 10 下观察到 Co(II) 和 Pb(II) 的有效分离。