Recovery and purification of ionic liquids from solutions: a review

Zhou, Jingjing; Sui, Hong; Jia, Zhen; Yang, Ziqi; He, Lin; Li, Xingang

doi:10.1039/c8ra06384b

Cited by 202 publications

(132 citation statements)

References 213 publications

(299 reference statements)

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“…Number of processes have been described for separation and purification of ILs, including adsorption, extraction, membrane separation, crystallization, distillation, and supercritical‐CO 2 ‐based extraction or precipitation, i.e., with supercritical CO 2 playing the role of either a cosolvent or an antisolvent, respectively. Unfortunately, many of these processes are high cost and/or require high‐energy input, and the purity of the recovered IL is yet an issue, mainly in terms of remaining water content . Among them, adsorption is particularly interesting as it is a robust and nondestructive process for the recovery of ILs.…”

mentioning

confidence: 99%

Highly Efficient and Recyclable Carbon‐Nanofiber‐Based Aerogels for Ionic Liquid–Water Separation and Ionic Liquid Dehydration in Flow‐Through Conditions

et al. 2019

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www.advmat.degraphene-based 3D architectures with superhydrophobic and superoleophilic properties have demonstrated a remarkable performance for separation and absorption of oils or organic solvents from water. For instance, hydrophobic CNT sponges prepared from randomly (i.e., nonaligned) interconnected CNTs and exhibiting a contact angle of about 156° for water droplets were of great utility for environmental applications because of their capability to absorb and remove different types of oil from aqueous biphasic systems. [11,12] Meanwhile, graphene sponges have been more widely used for the absorption and separation of petroleum products, vegetable oils, and organic solvents from water. [13][14][15] In recent years, substitution of regular organic solvents by ionic liquids (ILs)molten salts with melting points below 100 °C-occurred in many diverse fields including catalysis, electrochemistry, separation and purification, or cellulose dissolution, among others., [16,17] For instance, in electrochemistry, the negligible vapor pressure of ILs makes them safer than regular organic electrolytes while preserving a wide operational electrochemical window-more so than that of aqueous ones. [18][19][20][21] However, hygroscopicity is quite common in ILs (even in hydrophobic ones) [22][23][24] becoming eventually a serious limitation for their practical use as electrolytes. [25] Moreover, ILs have also been used as catalysts or CO 2 sorbents, thus being regarded as "green solvents" because their negligible vapor pressure offered a more friendly alternative, in environmental terms, to common organic solvents used in industrial processes. Nonetheless, recent works have reported on contamination of aquatic environments with toxic and/or nonbiodegradable ILs. [26,27] Number of processes have been described for separation and purification of ILs, including adsorption, [28] extraction, [29] membrane separation, [30] crystallization, [31] distillation, [32,33] and supercritical-CO 2 -based extraction or precipitation, [34,35] i.e., with supercritical CO 2 playing the role of either a cosolvent or an antisolvent, respectively. Unfortunately, many of these processes are high cost and/or require high-energy input, and the purity of the recovered IL is yet an issue, mainly in terms of remaining water content. [36] Among them, adsorption is particularly interesting as it is a robust and nondestructive process for the recovery of ILs. In this regard, activated carbons Ionic liquids (ILs) are being widely used in many diverse areas of social interest, including catalysis, electrochemistry, etc. However, issues related to hygroscopicity of many ILs and the toxic and/or nonbiodegradable features of some of them limit their practical use. Developing materials capable of IL recovery from aqueous media and dehydration, thus allowing their recycling and subsequent reutilization, in a single and efficient process still poses a major challenge. Herein, electrically conductive aerogels composed of carbon nanofibers (CNFs) with remarkable sup...

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confidence: 99%

Highly Efficient and Recyclable Carbon‐Nanofiber‐Based Aerogels for Ionic Liquid–Water Separation and Ionic Liquid Dehydration in Flow‐Through Conditions

et al. 2019

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“…High-purity water (18.25 MU cm) was used to prepare all aqueous solutions. 1 H NMR, 13 C NMR and 1 H-1 H 2D ROESY NMR measurements were performed on Bruker Avance-400 spectrometer operating at 400 MHz. ESI-MS was carried out on a mass spectrometer (6120 Single Quad, Agilent).…”

Section: Materials and Apparatusmentioning

confidence: 99%

“…Compared the TG curve of AD-C 11 im/b-CD inclusion complexes with physical mixtures, it is not difficult to nd that the inclusion complexes possessed high decomposition temperature, which implies that the AD-C 11 im@2b-CD host-guest inclusion complexes were indeed formed. 1 H-1 H 2D ROESY NMR, which can reect the interaction between hydrogen atoms with space distance less than 0.5 nm, is an effective way to study host-guest inclusion interaction. In order to conrm the formation of inclusion complexes between AD-C 11 im and b-CD at different molar ratios, 2D ROESY spectra of AD-C 11 im/b-CD inclusions in proportion of 1 : 1 and 1 : 2 were performed and data were exhibited in Fig.…”

Section: Nmr Characterization For Ad-c 11 Im/b-cd Inclusionsmentioning

confidence: 99%

“…Ionic liquids (ILs), which are composed of various ions, have successfully aroused the interest of many scientists during the past few years. 1 Compared with traditional organic solvents, ILs have many unique properties and are widely used in catalysis and chemosynthesis, 2,3 materials, medicine, energy applications, 4,5 carbon dioxide capture, 3,6 analytical applications, 7 and so on. ILs have been the frontier and hotspots of international green chemistry and chemical industry.…”

Section: Introductionmentioning

confidence: 99%

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Self-assembly of supra-amphiphiles building block fabricated by β-cyclodextrin and adamantane-based ionic liquid

Zhong

Yan

et al. 2019

RSC Adv.

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A new adamantane-based ionic liquid, (11-(((-adamantane-1-carbonyl)oxy)undecyl)-1-methylimidazol-3-ium bromide (AD-C 11 im), was synthesized from 1-adamantanecarboxylic acid and observed that it can aggregate into micelles in aqueous solution. A number of experiments were conducted to understand the self-assembly of supra-amphiphiles building block fabricated by b-cyclodextrin (b-CD) and adamantane-based ionic liquid at diverse molar ratios. Studies revealed that host-guest interaction between the adamantane group and b-CD occurred and AD-C 11 im@1b-CD building block formed when same amount b-CD was added. Then the micelles aggregates formed by AD-C 11 im only turned into spherical vesicles, which was confirmed by AFM, DLS and TEM.Besides, according to the results of AFM, it can be confirmed that the vesicles were monolayer structure. When double amount b-CD was added, both the adamantane group and the hydrophobic chain were encapsulated by b-CD and AD-C 11 im@2b-CD building block formed. Thus the aggregations changed from vesicles to net-like nanofiber, which was observed by TEM. When the b-CD concentration increased to 40 mM, the formation of light blue hydrogel was observed during the self-assembling process of AD-C 11 im@2b-CD building block.

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“…Amongst the mentioned groups, ammonium, imidazolium, pyridinium and phosphonium ions-substituted cationic polymers draw a lot of attention to them due to their similar peptide-like structures which result in a highly active antimicrobial property [4][5][6][7][8]. Ionic liquids, by definition, are considered as the salts with a melting point less than 100 °C which are consisted of poorly coordinated molten cations and anions [9,10]. These compounds have been known to scientists for more than a century, but due to their unique properties, they have been under strict security protections, and just recently have been made available to the public as proper solvents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of two novel alanine-based antibacterial and antioxidant chiral ionic liquids

Matavos-Aramyan¹,

Matavos-Aramyan²,

Soukhakian³

2019

SN Appl. Sci.

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Ionic liquids have drawn a lot of attraction due to their unique properties. In this paper, a simple, inexpensive, easy to handle, and efficient method for the synthesis of 1-(4-((1-carboxyethyl)carbamoyl)benzyl)pyridin-1-ium chloride and 1-(4-(((1-carboxyethyl)carbamothioyl)carbamoyl)benzyl)pyridin-1-ium chloride as two novel chiral ionic liquids based on the L-(+)-alanine amino acid is introduced. Their structures were confirmed via 1 H-NMR, 13 C-NMR and FT-IR spectroscopies. Minimum inhibitory concentration method was used to study their antibacterial properties. Their antioxidant properties were investigated on 2,2-diphenyl-1-picrylhydrazyl as a free radical. Results confirmed these compounds as strong antibacterial and antioxidant ionic liquids, capable of replacing many antibiotic, and potentially, anticancer compounds.

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Recovery and purification of ionic liquids from solutions: a review

Abstract: Recovery and purification of ionic liquids from solutions.

Cited by 202 publications

References 213 publications

Highly Efficient and Recyclable Carbon‐Nanofiber‐Based Aerogels for Ionic Liquid–Water Separation and Ionic Liquid Dehydration in Flow‐Through Conditions

Highly Efficient and Recyclable Carbon‐Nanofiber‐Based Aerogels for Ionic Liquid–Water Separation and Ionic Liquid Dehydration in Flow‐Through Conditions

Self-assembly of supra-amphiphiles building block fabricated by β-cyclodextrin and adamantane-based ionic liquid

Synthesis of two novel alanine-based antibacterial and antioxidant chiral ionic liquids

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