Abstract
In this work, the capacity of three different imidazolium-based ionic liquids (ILs) for atmospheric mercury capture has been evaluated. Theoretical calculations using monomer and dimer models of ILs showed that [BMIM]+[SCN]− and [BMIM]+[Cl]− ionic liquids capture gaseous Hg0, while [BMIM]+[PF6]− shows no ability for this purpose. These findings are supported by experimental data obtained using particle induced X-ray emission (PIXE) trace element analysis. Experimental and theoretical infrared data of the ILs were obtained before and after exposure to Hg. In all cases, no displacement of the bands was observed, indicating that the interaction does not significantly affect the force constants of substrate bonds. This suggests that van der Waals forces are the main forces responsible for mercury capture. Since the anion-absorbate is the driving force of the interaction, the largest charge-volume ratio of [Cl]− could explain the higher affinity for mercury sequestration of the [BMIM]+[Cl]− salt.
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Acknowledgments
This work is a result of the FONCICYT (Fondo de Cooperación Internacional en Ciencia y Tecnología) Mexico-EU ‘RMAYS’ network, Project Nº 94666. Partial support was also received by DGAPA UNAM (Dirección General Asuntos del Personal Académico Universidad Nacional Autónoma de México) under grants IN112609 and IN219609. We gratefully acknowledge the Laboratorio de Supercómputo y Visualización en Paralelo at Universidad Autónoma Metropolitana-Iztapalapa and the Dirección General de Cómputo y de Tecnologías de Información y Comunicación (DGTIC) at Universidad Nacional Autónoma de México for computer time.
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Iuga, C., Solís, C., Alvarez-Idaboy, J.R. et al. A theoretical and experimental evaluation of imidazolium-based ionic liquids for atmospheric mercury capture. J Mol Model 20, 2186 (2014). https://doi.org/10.1007/s00894-014-2186-8
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DOI: https://doi.org/10.1007/s00894-014-2186-8