Journal
INTERNATIONAL JOURNAL OF INDUSTRIAL CHEMISTRY
Volume 8, Issue 2, Pages 187-195Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40090-016-0090-z
Keywords
Removal of dye; Persea americana-activated carbon; Surface area; Adsorption; Kinetics and thermodynamic studies
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Adsorption study of Basic Blue 41 dye onto activated carbon from Persea americana nuts with phosphoric acid activation was achieved. The effect of operating parameters, the effect of pH (2-12), adsorbent amount (5-30 mg/50 mL), dye concentration (25-125 mg/L), contact time (0-200 min) and temperature (298-323 K), on the adsorption capacity was examined. The experimental isotherm data were analyzed using Langmuir and Freundlich models, which showed that the best fit was achieved by the Langmuir model with the maximum monolayer adsorption capacity at 625 mg/g. The adsorption kinetic process followed pseudo-second-order kinetics. Thermodynamic evaluation showed that the process was endothermic (Delta H-0 = 144.60 kJ/mol) and spontaneous (Delta G(0) varied from to -11.64 to -19.50 kJ/mol), while the positive value of entropy (Delta S-0 = 524.3 J/mol K) revealed increased randomness at the adsorbent-adsorbate interface. It was found to be a very efficient adsorbent and a promising alternative for dye removal from aqueous solutions.
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