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Summarizing the Effect of Acidity and Water Content of Deep Eutectic Solvent-like Mixtures—A Review

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  • Veronika Jančíková

    (Department of Wood, Pulp and Paper, Institute of Natural and Synthetic Polymers, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia)

  • Michal Jablonský

    (Department of Wood, Pulp and Paper, Institute of Natural and Synthetic Polymers, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia)

  • Katarína Voleková

    (Department of Wood, Pulp and Paper, Institute of Natural and Synthetic Polymers, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia)

  • Igor Šurina

    (Department of Wood, Pulp and Paper, Institute of Natural and Synthetic Polymers, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia)

Abstract

Deep eutectic solvent-like (DES-like) mixtures re-emerged in green chemistry nineteen years ago and yet have led to a large number of publications covering different research areas and different application industries. DES-like mixtures are considered a special class of green solvents because of their unique properties, such as high solubilization ability, remarkable biocompatibility, low production cost, low volatility, relatively simple synthesis methods, and considerable stability. Several studies have been published that analyze the effect of acidity/alkalinity and water content in DES-like mixtures on their physicochemical properties and behavior. This work summarizes the characterization of green solvents and, subsequently, the influence of various factors on the resulting pH values of green solvent systems. Part of this work describes the influence of water content in DES-like mixtures on their physical and chemical properties. The acidity/alkalinity effect is very important for green solvent applications, and it has the main impact on chemical reactions. As the temperature increases, the pH of DES-like mixtures decreases linearly. The type of hydrogen bond donors has been shown to have an important effect on the acidity of DES-like mixtures. The water content also affects their properties (polarity, solubilization capacity of DES-like mixtures).

Suggested Citation

  • Veronika Jančíková & Michal Jablonský & Katarína Voleková & Igor Šurina, 2022. "Summarizing the Effect of Acidity and Water Content of Deep Eutectic Solvent-like Mixtures—A Review," Energies, MDPI, vol. 15(24), pages 1-23, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9333-:d:998588
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    References listed on IDEAS

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    1. Zedong Teng & Liyan Wang & Bingqian Huang & Yue Yu & Jianwei Liu & Tinggang Li, 2022. "Synthesis of Green Deep Eutectic Solvents for Pretreatment Wheat Straw: Enhance the Solubility of Typical Lignocellulose," Sustainability, MDPI, vol. 14(2), pages 1-11, January.
    2. Zhou, Man & Fakayode, Olugbenga Abiola & Ahmed Yagoub, Abu ElGasim & Ji, Qinghua & Zhou, Cunshan, 2022. "Lignin fractionation from lignocellulosic biomass using deep eutectic solvents and its valorization," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
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