| Summary: | 碩士 === 國立聯合大學 === 化學工程學系碩士班 === 98 === Chars prepared from rice husk, sugarcane leaves and tea by H2SO4 carbonization method. The obtained chars had specific surface areas 8.36 to 46.03 m2/g. Oxide functional group of carbons according to temperature programmed desorption (TPD). The adsorption kinetics and equilibrium isotherms of methylene blue (MB) and malachite green (MG) from water at 30℃ on the chars were studied. Four simplified models including the Elovich equation, intraparticle diffusion model, pseudo-first-order equation and pseudo-second-order equation were used to test the adsorption kinetics, the adsorption of this work were best fitted by pseudo-second-order equation. Rice husk, sugarcane leaves and tea the maximum monolayer sorption capacity obtained from the Langmuir model was 303, 357 and 333 mg/g for MB dyes, respectively; 384, 345 and 333 mg/g for MG dyes, respectively. CO2 capture capacities were found to be 2.47, 2.63 and 2.44 mmol/g at rice husk, sugarcane leaves and tea, respectively. It is practicable of chars prepared from agricultural waste by H2SO4 carbonization method to removed dyes.
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