Dipartimento di Scienze Biologiche Chimiche e Farmaceutiche, Università degli Studi di Palermo, Viale delle Scienze Ed. 17, 90128, Palermo, Italy.
Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, 90128, Palermo, Italy.
Chempluschem. 2020 Feb;85(2):301-311. doi: 10.1002/cplu.202000017.
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.
当前对可持续性和环境的关注使得低影响材料成为环境修复的理想选择，特别是在废水处理方面。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。在对凝胶进行特性分析，并研究凝胶-溶胶转变温度、凝胶形成动力学、流变性能和形态后，将这些凝胶用作吸附剂，从水溶液中去除阳离子染料。分析了 pH 值、染料性质、体积和废水浓度的影响，结果发现基于 l-苯丙氨酸的共晶凝胶的效果最佳。它可以至少重复使用 9 次而不会降低效率，即使是在处理染料混合物时也是如此。有趣的是，这种凝胶可以装在柱子上对流动溶液进行脱色，仅需 10 分钟即可达到 85%的去除效率，并且至少可以重复使用 4 个周期。就吸附容量而言，这种共晶凝胶与高效的基于凝胶的染料吸附剂系统具有竞争力，在高浓度罗丹明 B（479mg/L）时达到 1930mg/g 的值。
