Removal of methylene blue in textile industry using activated carbon from mangrove pile leftover via chemical activation
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Date
2018-06
Authors
Kok, Joe Ye
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Abstract
In this research, mangrove pile leftovers which were mainly dumped as
construction waste were used as the raw precursors to prepare activated carbon for
methylene blue removal which could be found mainly in textile industries. The main
objective of this research was to prepare activated carbons from mangrove pile
leftovers via chemical activation using phosphoric acid. The effects of different
factors such as impregnation ratio of phosphoric acid to precursor as well as
activation temperature on the yield of activated carbon and the adsorption capacity
on methylene blue were studied. Highest yield of activated carbon was obtained for
preparation condition of IR of 2 and Ta of 400 C, with yield of 34.83 %. An
impregnation ratio of 2 and activation temperature of 600 C were found to be the
optimum condition for activated carbon preparation since maximum adsorption
capacity of 388.88 mg/g was observed. The adsorption of methylene blue on the
activated carbon prepared was found to be multilayer adsorption since it fit well to
Freundlich isotherm with R2 of 0.9601. From perspective of kinetic study, the
experimental data of adsorption of methylene blue on optimal activated carbon was
fit well to Pseudo-second order model with R2 of 0.9592. BET surface area,
Langmuir surface area and total pore volume of the optimally prepared activated
carbon were 802.3744 m2/g, 1186.3197 m2/g and 0.412336 cm3/g respectively. After
the activation process, the carbon content of activated carbon was found to be
increased from 59.91 to 84.68 wt% since more volatile materials were released.