Current concerns for sustainability and the environment make low-impact materials desirable for environmental remediation and, in particular wastewater treatment. We obtained supramolecular gels of l-amino acids in the deep eutectic solvent formed by choline chloride and phenylacetic acid. After gel characterization, and investigating gel-sol transition temperatures, gelation kinetics, rheological properties, and morphology, the gels were applied as sorbents to remove cationic dyes from aqueous solutions. The effects of the pH, dye nature, volume, and concentration of wastewater were analyzed, and the best result was obtained with a l-phenylalanine-based eutectogel. It can be reused for at least 9 times without losing efficiency, also with dye mixtures. Interestingly, this gel can be loaded onto columns to decolorize flowing solutions, achieving 85 % of removal efficiency in only 10 minutes and allowing its reuse for at least 4 cycles. In terms of adsorption capacity, this eutectogel is competitive with efficient gel-based dye sorbent systems, with a value 1930 mg/g reached at a high concentration of rhodamine B 479 mg/L.

中文翻译：

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包含l-氨基酸和深共晶溶剂的环保型共晶凝胶：用于废水处理的高效材料。

当前对可持续性和环境的关注使得低影响力的材料可用于环境修复，尤其是废水处理。我们在由氯化胆碱和苯乙酸形成的深共熔溶剂中获得了l-氨基酸的超分子凝胶。表征凝胶并研究凝胶-溶胶的转变温度，凝胶动力学，流变性质和形态后，将凝胶用作吸附剂，以从水溶液中去除阳离子染料。分析了pH值，染料性质，废水量和废水浓度的影响，使用基于L-苯丙氨酸的共晶凝胶可获得最佳结果。染料混合物也可以重复使用至少9次而不会降低效率。有趣的是，可以将这种凝胶上样到色谱柱上以使流动的溶液脱色，仅需10分钟即可达到85％的去除效率，并至少可重复使用4个周期。就吸附能力而言，该共晶凝胶与高效的基于凝胶的染料吸附剂系统具有竞争性，在高浓度若丹明B 479 mg / L时达到了1930 mg / g的值。