Experimental investigation of density, viscosity, and surface tension of aqueous tetrabutylammonium-based ionic liquids
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GREEN TECHNOLOGIES FOR SUSTAINABLE WATER
Experimental investigation of density, viscosity, and surface tension of aqueous tetrabutylammonium-based ionic liquids Muthumari Perumal 1 & Ambedkar Balraj 1 & Dhanalakshmi Jayaraman 1 & Jagannathan Krishnan 1 Received: 1 May 2020 / Accepted: 6 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The physical properties such as density, dynamic viscosity, and surface tension of aqueous tetrabutylammonium-based ionic liquids were measured experimentally by varying temperature (283.4 to 333.4 K) and concentration of ILs (10–50 wt%) at an interval of 10 K and 10 wt% respectively. In this study, the aqueous tetrabutylammonium-based ionic liquids namely tetrabutylammonium acetate [TBA][OAC], tetrabutylammonium bromide [TBA][Br], and tetrabutylammonium hydroxide [TBA][OH] was used to investigate the influence of temperature and concentration of ILs on the physical properties data was examined. It is observed that both density and surface tension increase with increasing concentration of [TBA][Br], whereas the opposite trend is observed for [TBA][OAC] and [TBA][OH] respectively. This is due to stronger molecular interaction between [TBA][Br] and water compared to other ILs. The dynamic viscosity of all aqueous ILs increases with increasing IL concentration. The measured physical properties of ILs decrease as temperature increases. Furthermore, the experimental data is correlated and compared with that of the calculated model; the agreement was satisfactory. Keywords Ionic liquids . Density . Dynamic viscosity . Surface tension
Introduction Ionic liquids are molten salts consist of asymmetric organic cation, accompanying with organic or inorganic anion. The Highlights • Physical properties such as density, viscosity, and surface tension of aqueous tetrabutylammonium-based ionic liquids have been investigated experimentally by varying ionic liquid (IL) concentration and temperatures. • The density and surface tension increases with increasing concentration of [TBA][Br], whereas the opposite trend is observed for [TBA][OAC] and [TBA][OH] respectively. • Dynamic viscosities of all aqueous ammonium-based ILs increases as IL concentration increases. • All the measured physical properties decrease with increasing temperature. • Further, the experimental physical properties data has been correlated using an empirical model. Responsible Editor: Philippe Garrigues * Dhanalakshmi Jayaraman [email protected]; [email protected] 1
Carbon Capture Lab, Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, Tamilnadu 603110, India
attractive features of ILs are negligible vapor pressure, nonvolatile, high thermal and chemical stability, and low melting point (Farahipour et al. 2016; Bazargani and Sabzi 2016; Shahrom et al. 2016; Shahrom et al. 2019; Kudłak et al. 2015; Roy et al. 2015; Siedlecka and Stepnowski 2009). Owing to these features, ILs are thus named environmentally friendly solvents or
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