Adsorption of imidazolium-based ionic liquids with different chemical structures onto various resins from aqueous solutions

Li, Luyang; Wang, Yu; Qi, Xinhua

doi:10.1039/c5ra04191k

Cited by 20 publications

(7 citation statements)

References 37 publications

(34 reference statements)

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“…Similar behavior was observed in the adsorption of ILs onto other adsorbents, such as activated carbons and soils [37,38]. The enhanced adsorption capacity for IL with longer alkyl chains is mainly attributed to higher van der Waals and polar interactions between the IL and the resins [25].…”

Section: Adsorption Isothermssupporting

confidence: 72%

“…Among the reported adsorbents (e.g., activated carbons [20,21], clays [22], and bacterial biosorbents [23], etc. ), ion-exchange resins are considered to be candidates for treatment of low-concentration ionic liquids solutions [24][25][26][27] due to the high adsorption efficiency and reusability. Sun et al [24] investigated removal of the cationic part of 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) from aqueous solution by twelve ion-exchange resins.…”

mentioning

confidence: 99%

“…The sulfonic acid ion-exchange resins showed the most efficient adsorption, while the particle size and crosslinking degree of resin exerted slight influence on the uptake of [Emim] cations. Li and coworkers [25] demonstrated that the anions of imidazolium-based ILs insignificantly affected the adsorption performance of ion-exchange resins, and enhanced adsorption capacity was observed for ILs with longer alkyl chains. However, the regeneration and reusing of the ion-exchange resins were not studied in their work.…”

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confidence: 99%

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Removal of Ionic Liquids from Oil Sands Processing Solution by Ion-Exchange Resin

Zhou

Niu

et al. 2018

Applied Sciences

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Featured Application: The work provides some fundamental understanding on the pretreatment and concentration of the ionic liquids solution, especially those with extremely low concentration of ionic liquids. This kind of method could be potentially combined with other methods, such as distillation, crystallization, etc., in the removal or recovery or purification of ionic liquids from solutions or waste solids. Abstract: Ionic liquids (ILs) have been reported to be good process aids for enhanced bitumen recovery from oil sands. However, after the extraction, some ionic liquids are left in the residual solids or solutions. Herein, a washing-ion exchange combined method has been designed for the removal of two imidazolium-based ILs, ([Bmim] [BF 4 ] and [Emim][BF 4 ]), from residual sands after ILs-enhanced solvent extraction of oil sands. This process was conducted as two steps: water washing of the residual solids to remove ILs into aqueous solution; adsorption and desorption of ILs from the solution by the sulfonic acid cation-exchange resin (Amberlite IR 120Na). Surface characterization showed that the hydrophilic ionic liquids could be completely removed from the solid surfaces by 3 times of water washing. The ionic liquids solution was treated by the ion-exchange resin. Results showed that more than 95% of [Bmim] [BF 4 ] and 90% of [Emim] [BF 4 ] could be adsorbed by the resins at 20 • C with contact time of 30 min. The effects of some typical coexisted chemicals and minerals, such as salinity, kaolinite (Al 4 [Si 4 O 10 ](OH) 8 ), and silica (SiO 2 ), in the solution on the adsorption of ionic liquids have also been investigated. Results showed that both kaolinite and SiO 2 exerted a slight effect on the uptake of [Bmim] [BF 4 ]. However, it was observed that increasing the ionic strength of the solution by adding salts would deteriorate the adsorption of [Bmim] + on the resin. The adsorption behaviors of two ILs fit well with the Sips model, suggesting the heterogeneous adsorption of ionic liquids onto resin. The adsorption of ionic liquids onto Amberlite IR 120Na resin was found to be pseudo-second-order adsorption. The regeneration tests showed stable performance of ion-exchange resins over three adsorption-desorption cycles.2 of 15 attracted increasing attention of researchers due to their unique characteristics, such as low vapor pressure, non-flammability under ambient conditions, high solvent capacity, a wide electrochemical window, and so forth [1,2]. The physical and chemical properties (e.g., solubility, polarity, viscosity, and acidity) of ILs could be designed simply by careful selection of the ions, thereby allowing "IL tailoring" for a particular application [3]. These unique and versatile properties suggest ILs as potential substituents for traditional volatile organic solvents in a wide range of fields such as synthesis and separation [4,5].Recently, some imidazolium-based ILs have been used to enhance solvent extraction of bitumen from oil sands. Compared to conventional solvent extractio...

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Section: Adsorption Isothermssupporting

confidence: 72%

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confidence: 99%

mentioning

confidence: 99%

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Removal of Ionic Liquids from Oil Sands Processing Solution by Ion-Exchange Resin

Zhou

Niu

et al. 2018

Applied Sciences

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“…If this were the only interaction present, changes to the MW would be rather small. ,, It is possible that the results of size-exclusion chromatography are in response to the lasting adsorption of imidazolium-based ILs on the surface of cellulose (Schemes and ). This would serve to increase the observed MW of the polymer due to its increased apparent physical size. , Interrogation of the IR spectra of the substrate and the recovered cellulose showed new C–H stretching vibrations at 2988 and 2960 cm –1 consistent with methyl groups, likely corresponding to the alkyl chains of the IL (Supporting Information, Figure S2). In addition, the specific solvent–solute interactions are evidenced by a decrease of characteristic bands for cellulose at 1428 (CH 2 scissors vibration), 1335 (OH in-plane deformation), 1315 (CH 2 tip vibration), and 1103 cm –1 (ring antisymmetric stretch). , In contrast to MCC, the dissolution of bulk cellulose required extended processing times (6 h).…”

Section: Results and Discussionmentioning

confidence: 85%

Dissolution of Cellulose: Are Ionic Liquids Innocent or Noninnocent Solvents?

Bodachivskyi

Page

Kuzhiumparambil

et al. 2020

ACS Sustainable Chem. Eng.

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Cellulose is a naturally abundant and readily accessible substrate for large scale biorefinery technologies. There has been a significant focus on ionic liquids as alternative solvents for the valorization of cellulosic substances. Ionic liquids dissolve cellulose in varying degrees, facilitating ready chemical transformations. However, there is no self-contained set of knowledge and information on the influence (or not) of the simple dissolution process on the cellulose molecule. Herein, we detail the dissolution, recovery, and characterization of cellulose in various classes of ionic solvents in a systematic study. This provides a view of the stability of cellulose in each solvent. We consider the major classes of ionic liquids commonly employed for cellulose chemistry, the dissolution in zinc chloride hydrate systems, quaternary ammonium salts, and deep eutectic solvents under varied processing conditions. We regenerate cellulosic material from the solvent and characterize the polymer employing gravimetric analysis, IR spectroscopy, and size exclusion chromatography. Surprisingly, most ionic liquids employed caused reduction in the MW of the cellulose.

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“…Influence of the chemical structures of imidazolium based ILs on the adsorption behavior onto ion exchange resins was studied by Li et al 152 It is found that the adsorption of ILs on resins was almost independent on the anions ([Cl] − , [PF 6 ] − and [Tf 2 N] − ) of the ILs. However, increasing the length of alkyl chains was observed to facilitate the adsorption of ILs on the resins.…”

Section: Methods For Recovery and Purification Of Ionic Liquids From ...mentioning

confidence: 99%

Recovery and purification of ionic liquids from solutions: a review

et al. 2018

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Adsorption of imidazolium-based ionic liquids with different chemical structures onto various resins from aqueous solutions

Abstract: The adsorption behavior of a series of imidazolium-based ionic liquids with different chemical structures onto various resins was investigated.

Cited by 20 publications

References 37 publications

Removal of Ionic Liquids from Oil Sands Processing Solution by Ion-Exchange Resin

Removal of Ionic Liquids from Oil Sands Processing Solution by Ion-Exchange Resin

Dissolution of Cellulose: Are Ionic Liquids Innocent or Noninnocent Solvents?

Recovery and purification of ionic liquids from solutions: a review

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