Synthesis of microwave-assisted coconut shell based activated carbon for removal of methylene blue dye from aqueous solution
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Date
2018-06
Authors
Nazatul Shima Nordin
Journal Title
Journal ISSN
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Abstract
The hazardous dye effluent from the textile, paper, cosmetic and food
processing plant have become a major concern because of the toxicity to the
environment. This study aims to synthesis activated carbon (AC) derived from coconut
shell (CS) in order to remove methylene blue (MB) dye from aqueous solution. The
coconut shell based activated carbon (CSAC) was prepared via physical activation
process by using microwave irradiation under the flow of carbon dioxide (CO2)
gasification. The effect of contact time (0-24 hours), initial concentration (25mg/L-300mg/L) and temperature (30˚C, 45˚C and 60˚C) on the adsorption performance of CSAC were evaluated. Optimum condition for the CSAC preparation was obtained at power and time of 440W and 6 minutes, respectively by using response surface
methodology (RSM). The optimized CSAC has high BET surface area, mesopore
surface area, total pore volume and fixed carbon of 658.44m2
/g, 502.31m2
/g,
0.4898cm3
/g and 82.13%, respectively. The pore for CSAC was the mesoporous type
with pore diameter of 5.72nm. Langmuir isotherm and pseudo-second-order was found
as the best fitted model for MB adsorption equilibrium and kinetic onto CSAC. The
monolayer adsorption capacity of MB onto CSAC was 217.3 mg/g. The adsorption
system was endothermic in nature and it was governed by physisorption. The
mechanism studies revealed that the adsorption process of MB onto CSAC were
controlled by film diffusion mechanism.