Adsorption of Fluoride from Water Solution on Bone Char

The effects of solution pH and temperature on the adsorption of fluoride onto bone char made from cattle bones were investigated in this work. It was found that the maximum adsorption took place at pH 3 and the adsorption capacity decreased nearly 20 times augmenting the pH from 3 to 12. This behavi...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2007-12, Vol.46 (26), p.9205-9212
Main Authors: Medellin-Castillo, Nahum A, Leyva-Ramos, Roberto, Ocampo-Perez, Raul, Garcia de la Cruz, Ramon F, Aragon-Piña, Antonio, Martinez-Rosales, Jose M, Guerrero-Coronado, Rosa M, Fuentes-Rubio, Laura
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Chemical engineering
Exact sciences and technology
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Summary:The effects of solution pH and temperature on the adsorption of fluoride onto bone char made from cattle bones were investigated in this work. It was found that the maximum adsorption took place at pH 3 and the adsorption capacity decreased nearly 20 times augmenting the pH from 3 to 12. This behavior was attributed to the electrostatic interactions between the surface of bone char and the fluoride ions in solution. The adsorption capacity was not influenced by temperature in the range from 15 to 35 °C. A comparison of fluoride adsorption capacities among several adsorbents revealed that the adsorption capacity of the bone char was 2.8 and 36 times greater than those of a commercial activated alumina (F-1) and a commercial activated carbon (F-400). The adsorption capacity is considerably dependent upon the physicochemical properties of the bone char surface and the solution pH.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie070023n