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- W2612482012 abstract "The adsorption mechanism of pure cellulose is yet to be explored. Thus, in this study, theadsorption mechanism of Microcrystalline Cellulose (MCC), a polysaccharide which is renewable,low cost and non-toxic, was studied on the adsorption of model dye Methylene blue (MB). It wasfound that the main adsorption mechanism of MB on MCC was due to the electrostatic attractionbetween the positively charged MB dye and negatively charged MCC. Thus, physical adsorptionwas the dominant effect, since electrostatic attraction is categorized as physical adsorption. This wasverified by Dubinin-Radushkevich isotherm, whereby mean free energy adsorption value was foundto be less than 8 kJ/mol. The values of Gibbs free energy for thermodynamics studies were found tobe within the range of -20 kJ/mol and 0 kJ/mol, which also indicated physical adsorption. It was dueto the electrostatic attraction as adsorption mechanism of this adsorption process which resultedrapid adsorption of MB dye. It was found that equilibrium dye concentration was achieved between1-3 minutes, depending on the adsorption temperature. The rapid adsorption, as compared to a lot ofmaterials, showed the potential of MCC as the future of green adsorbent. The adsorption ofMethylene Blue on MCC fitted well in Langmuir Isotherm, with R2values of higher than 0.99, whilefitted moderately in Freundlich Isotherm, with R2values between 0.9224 and 0.9223.Comparatively, the adsorption of MB on MCC fitted best Langmuir Isotherm as compared toFreundlich Isotherm which monolayer adsorption occurred at the homogenous surface of MCC. Thisalso indicated adsorbed MB molecules do not interact with each other at neighboring adsorptionsites. The maximum adsorption capacity calculated from Langmuir Isotherm was found to be 4.95mg/g. Despite the potential of MCC as green adsorbent, the challenge of low adsorption capacity hasto be addressed in the future." @default.
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- W2612482012 date "2016-08-01" @default.
- W2612482012 modified "2023-09-26" @default.
- W2612482012 title "Adsorption Mechanism of Microcrystalline Cellulose as Green Adsorbent for the Removal of Cationic Methylene Blue Dye" @default.
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