Abstract

MORALES, Alejandra et al. Highly-polar Layered Double Hydroxides are Efficient Adsorbents of Low-concentrated Trihalomethanes Present in Water. J. Mex. Chem. Soc [online]. 2018, vol.62, n.3, pp.99-109.  Epub July 02, 2020. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v62i3.557.

Replacement of (Al(OH)6)3- blocks by (AlF6)3- was explored as a strategy to modify the dipolarity of layered double hydroxides materials (LDHs). The presence of fluorine augments the dipolarity/polarizability of LDHs. LDHs were tested as adsorbents of the trihalomethanes CHCl3 and CHBr3 that are present (low concentrated) in water. Fluorinated LDHs were significantly more efficient compared to that without fluorine. Thermal treated fluorinated LDHs are able to remove 95% and 90% of CHCl3 and CHBr3, respectively, present in low concentrated aqueous solutions. The effect of concentration of triahalomethanes, time of contact and structure of adsorbent were explored. Linear isotherms were obtained when un-fluorinated adsorbents were used but the isotherm turns to match that of Freundlich-type when adsorbent contains fluorine.

Keywords : Layered double hydroxides; Fluorine; Adsorption; Trihalomethanes; Water pollution.

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