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Complete process for the selective recovery of textile dyes using aqueous two-phase system

机译：使用两相系统选择性恢复纺织品的完整方法

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Environmental problems arising from the release of dyes through industrial aqueous effluents are an emerging concern. To mitigate the problem, this work provides an experimental study on the use of aqueous two-phase systems (ATPS) for the selective separation and posterior recovery of dyes. Additionally, the complete recycling of the phase forming components is achieved. Azo dyes used in real textile industries, Direct Red 80 - DR80 and Direct Yellow 86 - DY86, were used. An initial screening of the ATPS forming elements was performed and the ATPS composed of 63 wt% acetonitrile (ACN) + 20 wt% cholinium bitartrate ([Ch] [Bit]) + water at 25 degrees C were selected. An extraction efficiency of around 91% of DY86 to the ACN-rich phase and of approximately 99% of DR80 to the [Ch] [Bit]-richphase was obtained. The Kamlet-Taft parameters of the ATPS coexisting phases were measured aiming to understand the partitioning mechanism, especially for the migration of DY86 to the ACN-rich phase. The recovery of the DR80 from [Ch] [Bill-rich phase was of about 93% using a chitosan adsorbent (1:75, m/v) under constant stirring and at 45 degrees C, while ACN was completely recovered by evaporation. It was herein demonstrated that an ATPS based on a common organic solvent and a cholinium-based ionic liquid has potential for the separation and recovery of textile dyes.
机译：通过工业水溶液释放染料产生的环境问题是一种新兴的关注。为了减轻问题，这项工作提供了对使用两相系统（ATP）的使用的实验研究，用于选择性分离和染料后恢复。另外，实现了相形成组分的完全再循环。使用真正的纺织工业，直接红色80 - DR80和直接黄色86-DY86中使用的偶氮染料。进行初始筛选ATP形成元件，选择由63wt％乙腈（ACN）+ 20重量％的丙酸胆碱（[CH] [比特]）+水为25℃。获得约91％的DY86至富含ACN的相的提取效率，并获得约99％的DR80至[CH] [位] - 溴化酶。测量ATP共存相的Kamlet-Traft参数，其旨在了解分配机制，特别是用于迁移DY86至富含ACN的相。在恒定搅拌下在恒定搅拌下和45℃下，使用壳聚糖吸附剂（1:75，m / v）和45℃，富含蛋白质吸附剂（1:75，m / v）回收DR80的回收率约为93％。通过蒸发完全回收ACN。本文证明，基于常见的有机溶剂和基于胆碱基离子液体的ATP具有纺织染料的分离和恢复的可能性。

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