Characterization Of An Absorbent Based On
Raphanus Sativus (L. Var.), A Solid Residue From
Biodiesel Production, For The Removal Of
Methylene Blue
Author(s)
D. A. Lázaro, C. L. Caldeira, M. S. S. Dantas, A. S. Franca
& M. B. Mansur
Abstract
In this study, an adsorbent produced from Raphanus sativus (L. var.), a residue
from the biodiesel industry, was investigated for the removal of methylene blue
(MB) from textile effluents aiming to: (i) obtain physical and textural
characteristics of the given carbon, and (ii) understand the MB adsorption
mechanism onto such carbonaceous structures. The following methods were
employed: SEM-EDS microscopy, gas adsorption and Raman spectroscopy.
Physical and textural characteristics of the carbon obtained by classical
methodologies such as BET, BJH and SEM analyses were corroborated by the
Raman analysis. For the experimental conditions used on the preparation of the
activated carbon of Raphanus sativus, the main physical parameters measured
were specific surface area (236.3 m2.g-1), total pore volume (0.06 cm3.g-1) and
average pore size (1.4 nm). SEM and Raman analysis revealed that a
microporous structure of carbon was obtained as the ratio between the disorder
band and the graphite band was higher than unity, thus indicating that MB
adsorption may occur predominantly at the surface of the adsorbent, given that
the diameter of MB molecule was estimated to be nearly 1.5 nm. Raman analysis
of solid MB revealed that MB molecules are predominantly found as dimmers in
the solid however they are adsorbed as monomer in the Raphanus sativus carbon.
Results evidence that MB adsorption probably occurs by bonding of monomer
Keywords
carbon characterization, Raman spectroscopy, adsorption, methylene blue
Related Book
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