| Summary: | 碩士 === 國立宜蘭大學 === 環境工程學系碩士班 === 102 === Fossil fuel depletion and global warming have spurred efforts to replace petroleum with renewable resources such as lignocellulosic biomass. Lignocellulosic materials are the most abundant renewable resources on the planet, and have great potential as biofuel fermentation substrates. Monosaccharide produces byproduct material caused by the furfural and hydroxymethylfurfural (HMF). Furfural and HMF in turn may inhibit the activity of glucoamylase rear a part to cut production of cellulose becomes monosaccharide. Magnetic adsorbent manufactured from magnetic (Fe3O4) can be easily recovered from treated water by magnetic force, without requiring further downstream treatment. In this study, magnetite modified with polystyrene (P-St/Fe3O4) was applicated to adsorb furfural and HMF in aqueous solution by using the phenyl group of polystyrene. The Furfural and HMF adsorption behavior by P-St/Fe3O4 was in good agreement with the Langmuir and Freundlich adsorption isotherm. The maximum adsorption capacity (qm) and Gibbs free energy of Furfural was 84.034 mg/g and -9.04 kJ/mol, respectively; the maximum adsorption capacity (qm) and Gibbs free energy of Furfural was 46.512 mg/g and -9.59 kJ/mol, respectively. A pseudo-second-order model could best describe the adsorption kinetics, Furfural and HMF derived activation energy was 8.74 kJ/mol and 7.64 kJ/mol, respectively. The optimum condition to desorb the Furfural and HMF are both from P-St/Fe3O4 is provided by a solution with 80 % ethanol solution, and both the recycled absorbent could be reused up to three times.
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