Complete removal of textile dyes from aqueous media using ionic-liquid-based aqueous two-phase systems

Ferreira, Ana M.; Coutinho, João A. P.; Fernandes, Ana M.; Freire, Mara G.

doi:10.1016/j.seppur.2014.02.036

Cited by 158 publications

(74 citation statements)

References 50 publications

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“…However, it should be kept in mind that the non stoichiometric partition of the DES components and the volatile nature of short chain carboxylic acids make the design of an integrated and sustainable separation process more complex than that required, for instance, with IL based ABS. 36 ■ ASSOCIATED CONTENT…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Are Aqueous Biphasic Systems Composed of Deep Eutectic Solvents Ternary or Quaternary Systems?

Passos

Tavares

Ferreira

et al. 2016

ACS Sustainable Chem. Eng.

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Deep eutectic solvents (DES) have emerged in the past few years as a new class of solvents with promising applications in several fields. In the present work, the application of DES (formed by binary mixtures of cholinium chloride and carboxylic acids or urea) as phase forming components of aqueous biphasic systems (ABS) is inves tigated. The mechanisms associated with the phases demixing of ABS composed of DES, as well as the DES stability in aqueous solutions, are investigated to address the critical question whether DES based ABS are in fact ternary or quaternary mixtures. It is shown that the DES integrity is destroyed in ABS by the disruption of the hydrogen bonding interactions of the complex (a result of the isolated components preferential solvation by water), and as confirmed by a nonstoichiometric partition of the DES components between the coexisting phases. As a result, there are no "real" DES based ABS; instead, there is the formation of ABS composed of four components, where the carboxylic acid used as the hydrogen bond donor species seems to act as an additive. Finally, it is shown that these ABS have an outstanding potential to be used in extraction processes, as it is here demonstrated with the complete separation of two dyes. However, the volatile nature of short chain carboxylic acids and the nonstoichiometric partition of the DES components in ABS make the development of recovery and recycling steps more difficult to accomplish. The formation of DES results from the formation of strong hydrogen bonds between the two starting materials, namely, a hydrogen bond donor (HBD) and a hydrogen bond acceptor (HBA). The formation of ion−HBD complexes leads to a lower entropic difference of the phase transition and to the further depression of the freezing temperature.5−7 The first reported DES (composed of [N 111(2OH) ]Cl and urea) 1 remains the most widely investigated. However, DES can be formed by mixing other substituted tetralkylammonium or phosphonium salts with a HBD, such as amines, carboxylic acids, and carbohydrates, among others. 8−10Many DES share some of the unique characteristics of ionic liquids (ILs), namely, a low volatility, high conductivity, wide liquid temperature range, and high solvation ability for a large number of compounds.3,4 DES are also able to overcome some of the disadvantages related to ILs. They are easier to prepare, by a simple mixture of the starting materials at moderate temperatures, without requiring a reaction step. Furthermore, the addition of an agent able to disrupt hydrogen bonding interactions can lead to the recovery of at least one of the initial compounds. 3,4,11,12 The starting materials are usually cheaper, toxicologically well characterized, and often derived from renewable resources, which results in low cost and more environmentally friendly products. 3,4,11,12 As in ILs, innumer ous combinations of the starting materials can be attempted, and therefore, DES may also be classified as "designer solvents". Since DES have fewer restrictions ...

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Section: ■ Results and Discussionmentioning

confidence: 99%

Are Aqueous Biphasic Systems Composed of Deep Eutectic Solvents Ternary or Quaternary Systems?

Passos

Tavares

Ferreira

et al. 2016

ACS Sustainable Chem. Eng.

Self Cite

183

114

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“…ATPS systems formed by potassium salts and polyethylene glycol (PEG) using ionic liquids as adjuvant have also been reported by Souza et al [16] for the partitioning of dyes chloranilic acid and rhodamine 6G. Recently, Ferreira et al [4] achieved extraction efficiencies of 100% when employing IL-ATPS for the extraction of dyes chloranilic acid, indigo blue and sudan III. In respect of these systems, little is known about the driving force that dictates how these dyes partition between the phases.…”

Section: Introductionmentioning

confidence: 80%

“…They have been successfully employed to separate several solutes such as: sulfonamides in milk [32], cytochrome C [33], bovine serum albumin [34], antibiotics in honey [35], textile dyes [4], among others. Fig.…”

Section: Partition Behavior Of Yr In Il-salt Aqueous Two-phase Systemmentioning

confidence: 99%

“…Despite the wide application of dyes, their disposal into the environment and contamination of water is a major problem that has aroused concern due to their adverse effects on human health, to fauna and to flora [2,3]. In view of the toxicity and undesirable effects to aquatic environments, environmental regulations have become increasingly stricter [4] and spurred a demand for efficient methodologies for the removal of toxic waste products.…”

Section: Introductionmentioning

confidence: 99%

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Partition study of textile dye Remazol Yellow Gold RNL in aqueous two-phase systems

Alvarenga

Fideles

Silva

et al. 2015

Fluid Phase Equilibria

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“…Dyes are widely used in different industries such as textile, leather, paper, plastics, and food [1,2]. There are more than 100,000 different synthetic dyes and their annual production is about 7·10 5 tonnes [3].…”

Section: -Introductionmentioning

confidence: 99%

Application of PVDF ultrafiltration membranes to treat and reuse textile wastewater

Buscio

Crespi

Gutiérrez‐Bouzán

2015

Desalination and Water Treatment

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In this work, the feasibility of polyvinylidene difluoride (PVDF) ultrafiltration membranes to treat textile wastewater was studied. The C.I. Disperse Orange 30 and C.I. Disperse Rubine 73 were selected as pollutant for the membrane filtration study.The results showed about 90% and 96% of COD decrease and dye removal, respectively. In addition, very low fouling was observed which demonstrated the feasibility of applying this type of membranes to treat textile wastewater.Finally, after the membrane treatment, 100% of the obtained permeate was reused.Fabrics dyed with the reused water were evaluated respect to references carried out with softened tap water. No significant colour differences were observed between reference fabrics and the fabrics dyed with the permeate.

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Complete removal of textile dyes from aqueous media using ionic-liquid-based aqueous two-phase systems

Cited by 158 publications

References 50 publications

Are Aqueous Biphasic Systems Composed of Deep Eutectic Solvents Ternary or Quaternary Systems?

Are Aqueous Biphasic Systems Composed of Deep Eutectic Solvents Ternary or Quaternary Systems?

Partition study of textile dye Remazol Yellow Gold RNL in aqueous two-phase systems

Application of PVDF ultrafiltration membranes to treat and reuse textile wastewater

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