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Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass
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Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass
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Journal Article
Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass
2013
Overview
In the present study, Juglans regia shells were used to prepare
activated carbon by acid treatment method. J. regia shell-based
activated carbon was used for the adsorption of two synthetic dyes
namely, a basic dye malachite green and an acid dye amido black 10B.
The prepared adsorbent was crushed and sieved to three different mesh
sizes 100, 600 and 1,000 μm. The adsorbent was characterized by
scanning electron microscopy, surface acidity and zero-point charge.
Batch experiments were carried out by varying the parameters like
initial aqueous phase pH, adsorbent dosage and initial dye
concentration. The equilibrium data were tested with Langmuir,
Freundlich, Redlich-Peterson and Sips isotherm at three different
temperatures 293, 300 and 313 K and it was found that the Freundlich
isotherm best fitted the adsorption of both the dyes. Kinetic data were
tested with pseudo first-order model and pseudo second-order model. The
mechanism for the adsorption of both the dyes onto the adsorbent was
studied by fitting the kinetic data with intraparticle diffusion model
and Boyd plot. External mass transfer was found to be the
rate-determining step. Based on the ionic nature of the adsorbates, the
extent of film diffusion and intraparticle diffusion varied; both being
system specific. Thermodynamic parameters were also calculated.
Finally, the process parameters of each adsorption system were compared
to develop the understanding of the best suitable system.
Publisher
Center for Environment and Energy Research and Studies (CEERS),Springer-Verlag,Springer Nature B.V
Subject
