Guerrero Medina, Jennifer

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    Structural, textural and gas adsorption properties of M(bdc)(ted)0.5 (M = Zn, Cu or Ni) upon spontaneous dispersion of metal salts
    (2016) Guerrero Medina, Jennifer; Hernández Maldonado, Arturo J.; College of Engineering; Martinez Iñesta, María M.; Méndez Román, Rafael; Raptis, Raphael G.; Department of Chemical Engineering; Hernández Rivera, Samuel P.
    Metal-organic frameworks (MOFs) are a family of nanoporous materials that have been well-studied during the past decades. Their high surface area, well defined pores, ease of assembly and good thermal stability are some of the characteristics that captured the researcher’s attention. Additionally, their potential use in different applications such as catalysis, sensors, drug delivery, separations and storage. In this work, a MOFs of the type M(bdc)(ted)0.5 (M = Zn, Ni or Cu) were functionalized via impregnation and spontaneous thermal metal dispersion techniques. The dispersed moieties consisted of a series of individuals metallic salts namely LiCl, NaCl, NaI and LiI. Different characterization techniques were implemented to understand the extent and effect of the inclusion of the salts. X-ray diffraction (XRD) patterns were collected to verify the crystalline phase of the samples prior to and after the dispersion process. The thermal stability of the materials was verified using thermogravimetric analysis (TGA) and the textural properties with N2 adsorption isotherms at -196 ºC. XRD patterns were also collected after adsorption and desorption of CO2 in an attempt to correlate the uptake hysteretic behavior observed in the LiCl containing materials to structural changes. Moreover, spectroscopy techniques including magic angle spinning nuclear magnetic resonance infrared and Raman were employed to study the local range structural changes observed upon inclusion of LiCl and the adsorption-desorption of CO2. Fractional uptake data were collected for CO2 and CH4 in Zn(bdc)(ted)0.5 prior to and after the dispersion of LiCl. Analyses of the data along with equilibrium selectivity values based on the ideal adsorbed solution theory (IAST) and isosteric heat of adsorption and desorption showed that LiCl containing samples are more selective toward CO2 when compared to CH4.