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Propionic acid modified bagasse was
used for the removal of reactive yellow 2 and reactive blue 4. The effects of
pH, contact time, initial dye concentrations, adsorbent particle size and
adsorbent dose on the adsorption of the two dyes were investigated.
Additionally, the desorption process and intra-particle diffusion were studied.
Acidic pH values were favorable for adsorption of both dyes. The equilibrium
adsorption data were best fitted with the Freundlich isotherm for reactive
yellow 2 and the Langmiur isotherm for reactive blue 4. The values of their
corresponding constants were determined. The kinetic for dye adsorption is well
described by a pseudo-first order kinetic model for the reactive yellow 2 and
by pseudo-second order for the reactive blue 4. The investigation revealed that
the hydroxyl groups of bagasse and the carboxylic group of propionic acid play
a great role in the removal of both reactive dyes.