Highly-polar layered double hydroxides are efficient adsorbents of low-concentrated trihalomethanes present in water

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Abstract

Replacement of (Al(OH) 6 ) 3- blocks by (AlF 6 ) 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 CHCl 3 and CHBr 3 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 CHCl 3 and CHBr 3 , 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.

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Morales, A., Hernández, M., Pérez, E., Guzmán, A., & Lima, E. (2018). Highly-polar layered double hydroxides are efficient adsorbents of low-concentrated trihalomethanes present in water. Journal of the Mexican Chemical Society, 62(3), 99–109. https://doi.org/10.29356/jmcs.v62i3.557

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