Fluoride compounds are widely distributed in nature and are generated in many industrial processes. In many parts of the world, significant causes of diseases are associated with elevated concentrations in drinking water. In comparison with other techniques, adsorption onto a solid surface (activated alumina, activated charcoal, zeolites, etc.) is a simple, versatile, and appropriate process for removal the fluoride. In this study, we synthesized Gamma alumina (γ-Al 2 O 3 ) by homogeneous precipitation and compared its effectiveness at removing fluoride from water to a commercial brand activated charcoal. Process was carried out at pH 5 and 7. Fibrillar morphology of the γ-Al 2 O 3 powder presents high porosity in comparison with the activated charcoal that has many small pores in its compact structure. Mesoporous γ-Al 2 O 3 powder has a lower surface area (332 m 2 • g -1 ) than microporous charcoal powder (601 m 2 • g -1 ), as determined by both gas nitrogen adsorption-desorption and scanning electron microscopy. However, γ-Al 2 O 3 has a higher zeta potential and lower particle size than that determined for the activated charcoal. Adsorption isotherms of the fluoride removal concur with the Langmuir model for both adsorbents. γ-Al 2 O 3 removes up to 95.5% of fluoride ions, significantly more than the activated charcoal (26%) at pH 5. Thus, based on results obtained, the adsorption process is controlled by the diffusion of fluoride ions in liquid immediately adjacent the outer surface of the adsorbent material. RESUMENLos compuestos de fluoruro están ampliamente distribuidos en la naturaleza y se generan en varios procesos industriales. En muchas partes del mundo, las causas importantes de enfermedades están asociadas con concentraciones elevadas de estos elementos en el agua potable. En comparación con otras técnicas, la adsorción sobre una superficie sólida (alúmina activada, carbón activado, zeolitas, etc.) es un proceso simple, versátil y adecuado para la eliminación del fluoruro. La gamma alúmina (γ-Al 2 O 3 ) sintetizada por precipitación homogénea se comparó con carbón activado comercial para la eliminación del fluoruro presente en el agua. El proceso se realizó a pH 5 y pH 7. La morfología fibrilar del polvo de γ-Al 2 O 3 presenta alta porosidad en comparación con el carbón activado, que muestra una gran cantidad de pequeños poros en su estructura compacta. Según lo determinado por adsorción-desorción de gas nitrógeno, el polvo de γ-Al 2 O 3 mesoporosa tiene un área de superficie menor (332 m 2 • g -1 ) que la obtenida para el polvo de carbón activado microporoso (601 m 2 • g -1 ), concordando con la porosidad observada por microscopía electrónica de barrido. Por otra parte, la γ-Al 2 O 3 tiene un potencial zeta mayor y tamaño de partícula menor que la determinada para el carbón activado. Las isotermas de adsorción del fluoruro concuerdan con el modelo de Langmuir para ambos adsorbentes. La γ-Al 2 O 3 elimina hasta el 95.5% de ion fluoruro mucho más que el carbón activado (26%) a pH 5. Así, con...
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