Remoción de Cr (Vi) en residuos líquidos de laboratorios de servicios analíticos por fotocatálisis heterogénea y bioadsorción
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. Laboratories in the educational
sector that offer analytical services and generate
dangerous residues of Cr (VI) in their methods
must adopt special measures for its elimination as
it is a highly carcinogenic species of a negative
environmental impact. Objective. Heterogeneous
photocatalysis and bioadsorption environmental
alternatives were evaluated in the removal of Cr
(VI) in liquid waste generated in analytical services
laboratories of the University of Nariño. Materials
and methods .In both methods a factorial design 23 with high and low levels was applied, allowing to
optimize the variables: pH = 1, amount of
photocatalyst (TiO2) 0.5 g and 30 minutes of
irradiation with UV light for the photocatalysis; and
the variables: amount of bioadsorbent (green
banana peel) 1g, pH = 1 and contact time of 60
minutes from Cr (VI) concentration of 100 mg / L for
bioadsorption. The efficiency of the two methods
was evaluated by comparing means and the
assessment of technical and environmental
feasibilitiy from matrices. Results. : From the liquid
waste with a total chromium concentration of 2,116
mg / L, removal rates of 96.07 ± 0.65 % were
obtained for photocatalysis and 99.9 % ± 0.01 for
the bioadsorption process; the latter showing a
better performance. Finally, the best technical and
environmental feasibility was obtained for
bioadsorption. Conclusion. Bioadsorption is
shown as an eco-efficient process and is therefore
presented as an environmentally sustainable
option for the elimination of Cr (VI) in the
management of hazardous waste.
Description
Keywords
Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Impacto ambiental, Fotocatálisis, Bioadsorción, Residuos peligrosos, Cromo hexavalente
Citation
Revista Producción + Limpia Vol. 13 N. 1