Activated carbon adsorbent from jengkol peel for dye removal equilibrium, kinetic and thermodynamic studies
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Date
2018-06
Authors
Mohamad Razif Mohd Ramli
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Abstract
Nowadays, textile industry has been recognized as the most significant source of
wastewater pollution mostly related to dyes which directly released into water bodies,
resulting in various environmental impacts. These dyes are always released in industrial
waste, leading to disposal problem. In the recent years, growing research interest in
conversion of agricultural waste into activated carbon (AC) as adsorbent for treating dyes
wastewater. The aim of this research is to study the performance of AC derived from jengkol
peel (JP) for removal of Methylene Blue (MB) dye by using physical activation which
involves carbon dioxide (CO2) gasification and microwave radiation. Optimum conditions for
preparation jengkol peel activated carbon (JPAC) were found at 400 W of radiation power
and 4 minute activation time which resulted 92.6% MB removal. Optimized JPAC has
Bruneaur-Emmet-Teller (BET) surface area, mesopore surface area, pore volume, fixed
carbon content of 474.03 m2/g, 332.64 m2/g, 0.389 cm3/g, and 70.45 % respectively. The pore
diameter of JPAC was discovered to be mesoporous at 4.28nm. Adsorption equilibrium of
MB on JPAC followed Freundlich isotherm. Kinetic studies of adsorption onto JPAC fit by
pseudo-second order kinetic models. Thermodynamic study shows the value of ∆Ho was
negative which gave an indication that the adsorption was exothermic process.