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Title: Optimization of Activated Carbon Preparation Process From Sesame (Sesamum Indicum) Husks and Its Application For Adsorption Of Cr(Vi) Ions From Aqueous Solution
???metadata.dc.contributor.*???: Teshome Worku (Mr.)
Ibrahim, Mohammedali
Keywords: Activated Carbon;Sesame (Sesamum Indicum) Husks;Adsorption Of Cr(Vi) Ions;Aqueous Solution
Issue Date: Oct-2015
Publisher: AAU
Abstract: The demand for activated carbon is increasing owing to the increased utility of the carbon materials in pollution control. As a result, cost of activated carbon is also growing depending on the application. Designing ways for the production of activated carbon through economic ways is the need of the hour. A range of low cost, easily available, carbon rich and low ash precursors and sources are being explored for the production of carbon materials. This research has presented sesame (Sesamum indicum) husks as row material for preparation of low cost activated carbon and assessed its potential application for adsorption of Cr(VI) from aqueous solution. Process variables for sesame husk activated carbon preparation were optimized response surface methodology (RSM). The effect of activating agent concentration, impregnation ratio, carbonization temperature and holding time were analyzed as main factor variable based on BBD. Adsorption % of Cr(VI) was used as response variable. The statistical significance of the model was investigated by ANOVA. The optimum condition during sesame husk based activated carbon preparations was found 30min, 614.70C, 1M, 1w/w and 76.41 for holding time, Carbonization Temperature, Concentrations of Activating agent, Impregnations Ratio and Adsorptions % respectively at pH 2, amount of adsorbent dosage of 0.5g in 100mL solutions and temperature of 250C. Characterization result shows sesame husk can be used as row material for productions of activated carbon with comparable property with other reported activated carbons. The optimum pH value for the adsorptions of was determined to be 2, at which the Cr(VI) removal of were determined to be approximately 76%. The uptake of chromium from solution by SHAC increased with contact time and attained equilibrium at 360min for all of the temperatures studied. The adsorptions kinetics of pseudo-first order and pseudo-second-order rate equations were tested on the kinetic data and the adsorptions process was found to follow pseudo-secondorder rate kinetics for all temperature. The Langmuir and Freundlich isotherm models were applied to the experimental equilibrium data depending on temperature at 30, 40 and 50oC, and the isotherm constants were determined by using linearized correlations coefficient. Equilibrium data were represented better by the Freundlich model than the Langmuir model. Freundlich equations was found to fit the equilibrium data for Cr(VI) adsorption with monolayer capacity of 18.34, 17.54 and 16.01 at 30, 40, and 500C respectively.
Appears in Collections:Enviromental Engineering

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