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Titulo en ingles: Cr(VI) adsorption by Cocos nucifera L. in wastewater of fibrocement from Santiago de Cuba Titulo corto: Adsorcion de Cr(VI) por Cocos nucifera L. Resumen: La adsorcion y/o formacion de complejos de metales pesados basados en la actividad quimica de la biomasa, es el proceso conocido como biosorcion y es la base de una nueva tecnologia para su remocion en efluentes industriales y su posterior recuperacion. En esta tecnologia se pueden utilizar diferentes tipos de biomasas tales como: algas, microorganismos y sub-productos agricolas. Este trabajo estudio la adsorcion de Cr(VI) utilizando la cascara del fruto de la planta Cocos nucifera L . como biomasa organica. Los valores optimos de adsorcion de Cr(VI) son: pH de 3 unidades; tamano de particula menor que 0,074 mm; dosis de adsorbente de 5 g.dm -3 y tiempo contacto de 1 hora. A valores bajos de concentracion del metal (1,0; 1,5 y 1,84 mg.dm -3 ) se obtuvo porcentaje de remocion superiores a 90, sin embargo a altos valores de concentracion (2,5 y 3 mg.dm -3 ), se obtienen valores inferiores al 90 %. El proceso pudo ser estudiado a traves de los modelos de Langmuir y de Freundlich, ya que el coeficiente de correlacion para ambos modelos fue de 0,994 y 0,991 respectivamente.  Se logra remover los iones Cr(VI) a valores de pH de 3 y 7 unidades en una matriz real, alcanzando valores de remocion de 96,85 % y 93,71 % respectivamente. Palabras clave: biosorcion, Cr 6+ , biomasa vegetal, Langmuir, Freundlich. Abstract:  Adsorption and/or formation of complexes of heavy metals based on the chemical activity of biomass, is the process known as biosorption and is the base of a new technology for its removal in industrials effluent and its posterior recovery. In this technology, different kinds of biomasses can be utilized such as: algae, microorganisms and agricultural subproducts. In this work, the adsorption of Cr(VI) was studied, utilizing the nutshell of Cocos nucifera L plant’s fruit as organic biomass. The optimal values of adsorption of Cr(VI)  are: pH of 3 units, size of particle smaller than 0.074 mm,  doses of adsorbent of 5 g.dm - 3 and 1 hour of contact time. At low values of concentration of the metal (1.0, 1,5 and 1.84 mg.dm -3 ) percentages of removal superior to 90% were obtained; however, at high values of concentration (2.5 and 3 mg.dm -3 ) values inferior to 90 % are obtained. The process can be studied by the models of both, Langmuir and Freundlich, because the coefficient of correlation for these two models was 0.994 and 0.991 respectively. The ions Cr(VI)  can be removed at values of 3 and 7 units in a real matrix, reaching removal values of 96.85% and 93.71% respectively. Key words: biosorption, Cr(VI), vegetal biomass, Langmuir, Freundlich.

Adsorción de Cr(VI) por Cocos nucífera L. en residuales de Fibrocemento en Santiago de Cuba