The quality of water distributed to the population in Zacatecas shows a deficit due to contaminants such as fluorinated compounds that exceed the limits allowed in the volumes of water used as a source of public supply. The objective of this work is to reduce the concentration of fluorides present in the drinking water of the municipality of Calera de Víctor Rosales, Zac., by using PVA cross-linked chitosan gel beads. An initial sample from a public supply was characterized, showing a fluoride concentration of 5.3 ppm, a value higher than the limit set in NOM-127-SSA1-1994. Batch experimentation was carried out at different degrees of sample dissolution with stirring conditions temperature of 450 rpm and 18.5 oC, respectively, in volumes of 150 mL and 0.3 g of chitosan gel beads. The adjustment of the experimental data to the various models of isotherms and adsorption kinetics was carried out; of these, the Freundlich isotherm and the pseudo-second order kinetic model are the models with the highest correlation to the experimental data. In addition, an average fluoride decrease of 80.08% was achieved in the samples with the established conditions.
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