Synthesis and Characterization of Iron Doped Mesoporous Silica Catalyst for Treatment of Biodiesel Wastewater
Author : Lopez, Gary Parolina, Jr.
Major Adviser : Gatdula, Kristel M.
Committee Members : Sanchez, Denise Ester S.; Eusebio, Ramon Christian P.
Year : 2019
Month : June
Type : Thesis
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The study focuses on the synthesis and characterization of FeCl₃-SiO₂ catalyst (using rice husk as silica source) used for biodiesel wastewater treatment. It determines the significance of effects of catalyst loading (1000 ppm, 5000 ppm), H₂O₂ loading (100mL/L, 500 mL/L) and reaction time (30 minutes, 120 minutes) on the % COD reduction. The rice husk was dried in an oven and acid leached with 0.5 M HCl at 60°C for the pre-treatment. The silica was produced by calcination at 600°C for 2 hours and impregnated with FeCl₃-6H₂O in 95 % wt ethanol at 80 °C for 4 hours. Using ANOVA, all individual factors are found to be significant and also the interaction effect of catalyst and H₂O₂ loading. All three factors incurred positive effects on %COD reduction. Increasing each parameter from its low setting to high setting decreases the COD reduction. The catalyst undergo BET analysis and results show it exhibits type IV adsorption and have the following textural properties: surface area-117.244 m²/g, pore radius-16.879Ǻ and pore volume-0.18 cm³/g. The highest % COD reduction (77.05) was attained at 1000 ppm catalyst, 500 mL/L H₂O₂ and 30 minutes reaction time. It was lowest (35.78 %) at 5000 ppm catalyst, 500 mL/L H₂O₂ and 120 minutes reaction time. The curvature in the model was found to be significant with p-value (0.01912) less than 0.05.
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