Absorción de Cromo Hexavalente en soluciones acuosas por cascaras de naranja (Citrus sinensis)
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Date
2015-07-31
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Área Metropolitana del Valle de Aburrá
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. Chromium can be found in industrial effluents, usually as CR (III) and CR (VI). The latter is very
toxic for all of the life forms and is also mutagenic and carcinogenic in humans. The conventional methods to
treat effluents with heavy metals, such as reduction, oxidation, ionic exchange, filtering and membrane technologies
are expensive and inefficient at low metal concentrations. The use of biomass eliminates the toxicity
problem and allows the recovery of the heavy metals retained, plus the possibility of reusing the adsorbent.
Objective. Orange peel as a Cr (VI) in aqueous solutions was studied. Materials and methods. The characterization
of the functional groups of the peels was performed by means of an elemental analysis and infrared
spectroscopy. The determination of the Cr (VI) concentration was made with the diphenylcarbazide method, by
the use of a UV-vis spectrophotometer. Results. The agro industrial waste used shows a 66,6 % removal of Cr
(VI) in a 120 minutes period. The phenomenon was better described by the Langmuir isotherm, having a 16,66
mg/g adsorption capacity. The kinetics followed the pseudo-second order adsorption behavior. Conclusions.
The most favorable conditions for the Cr (VI) ions adsorption on orange peels were those at a 3 pH and an
adsorbent size of 0,425mm. It was demonstrated that the peels can be used to remove Cr (VI) from waste water
originated by tannery and other industries.
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Keywords
Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Cromo - Investigaciones, Tratamiento de aguas, Tratamiento de aguas residuales, Naranjas - Investigación