| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系 === 102 === Modified waste carbon fiber using phosphoric acid and hydrogen peroxide with microwave and adsorption of aqueous reactive dye RB19 was investigated. The results indicated that while the wattage of microwave increased from 500, 700, to 900 W (named 5HP, 7HP, and 9HP), the adsorption capacity increased. Using microwave technology prepared modified waste carbon fiber to adsorbent and percent yield of modified waste carbon fiber was over 60% because of the less preparing time of microwave heating. In addition, pyrolysis temperature of modified waste carbon fibers was more than original waste carbon fiber and it should be conducive thermal desorption to increase for reuse. The results of adsorption isotherm showed that while dye concentration was 30 mg/L, the temperature increased from 17 ℃ to 57 ℃, the adsorption capacity using 9HP increased from 48.85 to 156.09 mg/g, and comparing with original waste carbon fiber showed about triple to octuplet adsorption capacity. Moreover, thermodynamic estimated that the adsorption process of dye was spontaneous and endothermic. The simulation of kinetics adsorption showed that the psedo-second order model for kinetic was suitable. The process was feasible to microwave technology using phosphoric acid and hydrogen peroxide and showed short preparing time of saving energy, high percent yield, and good adsorption capacity.
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