Sorption Studies of Methylene Blue Dye in Aqueous Solution by Optimised Carbon Prepared from Guava Seeds (Psidium guajava L.)
Keywords:adsorption kinetic, methylene blue, activated carbons, guava seeds, Langmuir adsorption isotherm.
The aim of this investigation was to determine the adsorption behavior and kinetics of methylene blue in aqueous
solution on activated carbons prepared from guava seeds by way of the two stage activation method in self-generated
atmosphere using a muffle furnace. The yield and ash contents of the activated carbons obtained decreased with the
increase of activation temperature and time. FT-IR spectra indicated high surface functional groups present in the
carbons. The optimised activated carbon, AK6, had a sorption kinetics that complied with the pseudo-second order
kinetics and was fitted well to Langmuir isotherm model. The highest adsorption capacity was obtained when the
samples (AK6) were subjected to activation temperature of 500 °C for 45 minutes giving iodine number of 198.12 mg g–1
and the percentage of methylene blue removal efficiency of 84.75 %.
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