Dipartimento STEBICEF-Sezione di Chimica-Università degli Studi di Palermo, Viale delle Scienze, Parco d'Orleans II, 90128 Palermo, Italy.
Dipartimento STEBICEF-Sezione di Chimica-Università degli Studi di Palermo, Viale delle Scienze, Parco d'Orleans II, 90128 Palermo, Italy.
J Colloid Interface Sci. 2018 May 1;517:182-193. doi: 10.1016/j.jcis.2018.01.111. Epub 2018 Feb 2.
Nanostructured sorbents and, in particular, supramolecular gels are emerging as efficient materials for the removal of toxic contaminants from water, like industrial dyes. It is also known that ionic liquids can dissolve significant amounts of dyes. Consequently, supramolecular ionic liquids gels could be highly efficient sorbents for dyes removal. This would also contribute to overcome the drawbacks associated with dye removal by liquid-liquid extraction with neat ionic liquids which would require large volumes of extractant and a more difficult separation of the phases.
Herein we employed novel supramolecular ionic liquid gels based on diimidazolium salts bearing naturally occurring or biomass derived anions, to adsorb cationic and anionic dyes from wastewaters. We also carried out a detailed investigation of thermal, structural, morphological and rheological features of our gels to identify which of them are key in designing better sorbents for environmental remediation.
The most effective gels showed fast and thorough removal of cationic dyes like Rhodamine B. These gels could also be reused up to 20 times without any loss in removal efficiency. Overall, our ionic gels outperform most of gel-based sorbents systems so far reported in literature.
纳米结构的吸附剂，特别是超分子凝胶，作为从水中去除有毒污染物（如工业染料）的有效材料而崭露头角。人们还知道离子液体可以溶解大量染料。因此，超分子离子液体凝胶可以成为去除染料的高效吸附剂。这也将有助于克服使用纯离子液体进行液-液萃取去除染料所带来的缺点，因为使用纯离子液体需要大量的萃取剂，并且相的分离更加困难。
本文采用新型基于二咪唑鎓盐的超分子离子液体凝胶，这些盐带有天然存在或源自生物质的阴离子，用于从废水中吸附阳离子和阴离子染料。我们还对我们的凝胶的热、结构、形态和流变学特性进行了详细研究，以确定哪些特性是设计用于环境修复的更好吸附剂的关键。
最有效的凝胶对阳离子染料如罗丹明 B 具有快速而彻底的去除效果。这些凝胶甚至可以重复使用 20 次以上，而去除效率没有任何损失。总的来说，我们的离子凝胶优于迄今为止文献中报道的大多数基于凝胶的吸附剂系统。
