Adsorción de azul de metileno sobre cascarilla de arroz
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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Área Metropolitana del Valle de Aburrá
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. The contamination produced by the download of industrial effluents, especially from textile, food
and paint industries, not only affects ecosystems due to its aesthetic degradation, but, above all, to the reduction
of photosynthetic processes. Dyes, due to their aromatic structure, are characterized by their difficult and slow
degradation, thus generating accumulations and becoming a contamination source that can even be carcinogenic
for some molecules. Adsorption on agricultural wastes appears as an innovative alternative, environmentally
favorable and very efficient to treat those dyed effluents. Objective. To find the conditions which allow an
efficient removal of the methylene blue dye on rice hulls by the use of the statistical design of experiments and
compositionally and structurally analyze the adsorbent material. Materials and methods. The best conditions
of the adsorption process were determined under a discontinuous system, evaluating an interval of the variables
pH value, dosage of the adsorbent, dye concentration and contact time. The temperature, the agitation and the
size of the particles were constant. The dye content was quantified by the use of Ultraviolet-Visible spectrophotometry.
Results. A maximum removal of 99% was obtained at pH 9.0, 3.5 mgL-1dosage, 10 mgL-1of concentration
and 163 minutes of contact time, with a good adjustment to the statistical models (R2 = 0.92) and with
no bias in the measuring. Conclusions. The statistical design was useful to establish the conditions necessary
to achieve a high efficiency to remove the methylene blue dye on rice hulls. It also proved that this agricultural
waste is a remarkable material to scale the process in a later phase.
Description
Keywords
Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Cascarilla de arroz, Aguas residuales, Aguas residuales industriales, Aguas residuales coloreadas, Colorantes textiles, Contaminación, Contaminación ambiental