Decolorization And COD Reduction Of Methylene Blue Dye Wastewater Through Adsorption Using Raw And Modified Bagasse

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dc.contributor.authorLow, Ling Wei
dc.date.accessioned2018-08-03T02:01:10Z
dc.date.available2018-08-03T02:01:10Z
dc.date.issued2011-05
dc.description.abstractIn the present study, batch and column adsorption systems were applied to study the adsorption of methylene blue (MB) from the dye aqueous solution onto a lignocellulosic material ―bagasse. The bagasse was modified with various carboxylic acids, namely citric acid (CA), oxalic acid (OA), and tartaric acid (TA). In order to improve chemical oxygen demand (COD) reduction, pretreatment of the bagasse with thorough washing using boiling distilled water was performed instead of conventional washing with distilled water at room temperature only. The effects of pH, adsorbent dosage, shaking speed, contact time, and temperature on decolorization and COD reduction were studied and optimized using response surface methodology (RSM) ―central composite design (CCD). The results show that the TA modified bagasse was more effective than raw bagasse (RB), CA modified bagasse, and OA modified bagasse in decolorization and COD reduction of MB dye from the aqueous solution. Maximum decolorization (99.05 %) and COD reduction (98.45 %) for TA modified bagasse were achieved at 0.78 g adsorbent dosage, pH 9.4, shaking speed of 120 rpm, 34 min contact time, and 49 oC. The adsorption kinetics were analyzed using four kinetic equations, namely, the pseudo-first order, pseudo-second order, the external diffusion model, and the intraparticle diffusion model to examine the adsorption mechanisms and potential rate controlling steps. TA modified bagasse showed good correlations with pseudo-second order kinetic model. Adsorption isotherm data were correlated with Langmuir, Freundlich, Temkin, Dubinin-Radushkevich (DR) isotherm models. The adsorption process followed the Langmuir isotherm as well as Freundlich isotherm. The enthalpy change (ΔHo) of 13.178 kJ/mol showed that adsorption using TA modified bagasse was endothermic in nature. The Gibbs free energy change (ΔGo) of -13.714 kJ/mol to -16.799 kJ/mol showed the feasibility of the process and the spontaneous nature of adsorption with a high preference of MB onto TA modified bagasse.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6154
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectThe adsorption of methylene blue from the dye aqueous solutionen_US
dc.subjectonto a lignocellulosic material bagasseen_US
dc.titleDecolorization And COD Reduction Of Methylene Blue Dye Wastewater Through Adsorption Using Raw And Modified Bagasseen_US
dc.typeThesisen_US
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