Estudio de modificación química y física de biomasa (citrus sinensis y musa paradisiaca) para la adsorción de metales pesados en solución

Abstract

The effect of changes to activated charcoal and chitosan coating of lignocellulosic
biomass obtained from banana and orange peels for the absorption of Cr (VI) was
studied. Characterization of the functional groups in the biomass suitable for the
adsorption was monitored by elemental analysis (CHON) and infrared
spectroscopy (IR), while for activated carbon surface area was determined by
BET analysis. The Cr (VI) content in solution was measured by UV-vis
spectrophotometer, using the diphenylcarbazide method. The results showed a
removal of Cr (VI) ions of 66.6 and 93 ppm for orange peels and banana peels
respectively; the activated carbons removed 85 and 95 ppm, while the modified
biomasses with chitosan showed an adsorption of 61.24 and 88.2 ppm. It was
observed that the adsorption kinetics was best described by the Pseudo Second
Order equation, and the bimetallic competitiveness effect was affected more by
nickel ions and to a lesser extent by lead ions.

Keywords

Adsorption

lignocellulosic biomass

activated carbon

hexavalent chromium

chitosan

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