Review and Perspectives for Effective Solutions to Grand Challenges of Energy and Fuels Technologies via Novel Deep Eutectic Solvents

Aparício, Santiago

doi:10.1021/acs.energyfuels.1c00303

Cited by 52 publications

(32 citation statements)

References 206 publications

(316 reference statements)

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“…The industrial transition to green and sustainable production processes has led to intensive research into alternatives to organic solvent-based processing. In this context, Natural Deep Eutectic Solvents (NADES) have attracted the interest of researchers from a diverse range of different analytical and applications fields [ 35 ], biotechnology [ 36 ], energy [ 37 ], water remediation [ 38 ], food industry [ 39 ], cosmetics and pharmaceutics [ 40 , 41 ], etc. NADES are solvents of great interest in chemistry, due to their unique solvent properties, including high extraction ability for some natural products and high solubilisation strength of a wide range of organic and inorganic compounds [ 35 , 42 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

et al. 2021

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Raman spectroscopy is a label-free, non-destructive, non-invasive analytical tool that provides insight into the molecular composition of samples with minimum or no sample preparation. The increased availability of commercial portable Raman devices presents a potentially easy and convenient analytical solution for day-to-day analysis in laboratories and production lines. However, their performance for highly specific and sensitive analysis applications has not been extensively evaluated. This study performs a direct comparison of such a commercially available, portable Raman system, with a research grade Raman microscope system for the analysis of water content of Natural Deep Eutectic Solvents (NADES). NADES are renewable, biodegradable and easily tunable “green” solvents, outcompeting existing organic solvents for applications in extraction from biomass, biocatalysis, and nanoparticle synthesis. Water content in NADES is, however, a critical parameter, affecting their properties, optimal use and extraction efficiency. In the present study, portable Raman spectroscopy coupled with Partial Least Squares Regression (PLSR) is investigated for rapid determination of water content in NADES samples in situ, i.e., directly in glassware. Three NADES systems, namely Betaine Glycerol (BG), Choline Chloride Glycerol (CCG) and Glucose Glycerol (GG), containing a range of water concentrations between 0% (w/w) and 28.5% (w/w), were studied. The results are directly compared with previously published studies of the same systems, using a research grade Raman microscope. PLSR results demonstrate the reliability of the analysis, surrendering R2 values above 0.99. Root Mean Square Errors Prediction (RMSEP) of 0.6805%, 0.9859% and 1.2907% w/w were found for respectively unknown CCG, BG and GG samples using the portable device compared to 0.4715%, 0.3437% and 0.7409% w/w previously obtained by analysis in quartz cuvettes with a Raman confocal microscope. Despite the relatively higher values of RMSEP observed, the comparison of the percentage of relative errors in the predicted concentration highlights that, overall, the portable device delivers accuracy below 5%. Ultimately, it has been demonstrated that portable Raman spectroscopy enables accurate quantification of water in NADES directly through glass vials without the requirement for sample withdrawal. Such compact instruments provide solvent and consumable free analysis for rapid analysis directly in laboratories and for non-expert users. Portable Raman is a promising approach for high throughput monitoring of water content in NADES that can support the development of new analytical protocols in the field of green chemistry in research and development laboratories but also in the industry as a routine quality control tool.

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Section: Introductionmentioning

confidence: 99%

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

et al. 2021

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“…Most of DESs are obtained by mixing appropriate hydrogen bond donors (HBDs) and hydrogen bond acceptors (HBAs). The applications of DESs in many fields have been investigated so far, such as organic synthesis, extractions processes, catalytic reactions and electrochemistry [3][4][5][6]. Moreover, DESs have been widely studied as absorbents for CO 2 capture [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

CO2 Absorption Mechanism by the Deep Eutectic Solvents Formed by Monoethanolamine-Based Protic Ionic Liquid and Ethylene Glycol

Cheng

Gao

et al. 2022

IJMS

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Deep eutectic solvents (DESs) have been widely used to capture CO2 in recent years. Understanding CO2 mechanisms by DESs is crucial to the design of efficient DESs for carbon capture. In this work, we studied the CO2 absorption mechanism by DESs based on ethylene glycol (EG) and protic ionic liquid ([MEAH][Im]), formed by monoethanolamine (MEA) with imidazole (Im). The interactions between CO2 and DESs [MEAH][Im]-EG (1:3) are investigated thoroughly by applying 1H and 13 C nuclear magnetic resonance (NMR), 2-D NMR, and Fourier-transform infrared (FTIR) techniques. Surprisingly, the results indicate that CO2 not only binds to the amine group of MEA but also reacts with the deprotonated EG, yielding carbamate and carbonate species, respectively. The reaction mechanism between CO2 and DESs is proposed, which includes two pathways. One pathway is the deprotonation of the [MEAH]+ cation by the [Im]− anion, resulting in the formation of neutral molecule MEA, which then reacts with CO2 to form a carbamate species. In the other pathway, EG is deprotonated by the [Im]−, and then the deprotonated EG, HO-CH2-CH2-O−, binds with CO2 to form a carbonate species. The absorption mechanism found by this work is different from those of other DESs formed by protic ionic liquids and EG, and we believe the new insights into the interactions between CO2 and DESs will be beneficial to the design and applications of DESs for carbon capture in the future.

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“…[9][10][11][12][13][14] When the melting point is low enough, DES can be utilized as solvents for use in many chemical and industrial applications, including battery technologies, catalysis, separations, and waste processing. 1,[15][16][17][18][19][20][21][22] Deep eutectic solvents are composed of a hydrogen bond acceptor (HBA) and a hydrogen bond donor (HBD), and are classified by what is used as the HBA and HBD. For example, type III DES have a quaternary ammonium salt as HBA, and the HBD is an organic molecule, whereas type V DES have organic molecules as the HBA and HBD.…”

Section: Introductionmentioning

confidence: 99%

Chiral Solvent Discovery: Exploring Chiral Eutectic Mixtures and Deep Eutectic Solvents

Hopkins

VandenElzen

Nelson

et al. 2022

Preprint

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Deep eutectic solvents (DES) are mixtures that have a melting point much lower than either component. Because the properties of a DES, such as chiral discrimination, can be controlled through choice of components, DES have potential as solvents in many chemical and industrial applications. However, the large number of potential components makes high throughput methods of DES discovery critical for their development. In this study, mixtures of small quantities of HBAs and chiral HBDs were mixed at 55 C and cooled to 20 C to screen for potential liquid formation. Variable molar ratios of 10 HBAs were mixed with 93 chiral HBDs to measure a total of 1250 mixtures, and 356 mixtures were liquid at 20 C. All of the results are provided in a publicly available database. Several of the mixtures were prepared in larger quantities to characterize their physical properties, including melting points, densities, and viscosities. The results of this study can be used to guide the discovery and development of new chiral DES.

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Review and Perspectives for Effective Solutions to Grand Challenges of Energy and Fuels Technologies via Novel Deep Eutectic Solvents

Cited by 52 publications

References 206 publications

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

CO2 Absorption Mechanism by the Deep Eutectic Solvents Formed by Monoethanolamine-Based Protic Ionic Liquid and Ethylene Glycol

Chiral Solvent Discovery: Exploring Chiral Eutectic Mixtures and Deep Eutectic Solvents

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