| Summary: | 碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 104 === Activated carbons were prepared from Areca catechu trunks via ZnCl2 and KOH chemical activation methods. The adsorption characteristics of activated carbons were studied and compared with a commercial activated carbon F300. In the acid activation method, Areca catechu trunk chips were immersed in ZnCl2 aqueous solutions (ZnCl2/ Areca catechu trunk chip= 1、1.5、2、2.5 by weight) and dried. Then the chips were activated at different temperature (450, 500 and 550℃) for 20 minutes and were treated with hydrochloric acid. In the base activation method, Areca catechu trunk chips were carbonized at 450℃ for 1.5 hr. The carbonized chars were steeped in KOH aqueous solutions (KOH/ char= 2、3、4 by weight) and were activated at 780℃ for 1 hr. The physical and chemical properties were measured by BET specific surface area analyzer and elemental analysis. Three simplified models including the Intraparticle diffusion mode, Pseudo-second-order, and Elovich equation were used to investigated the adsorption kinetics of activated carbon for dyes (MG, MB, BB1, AB74) and phenols (4-CP, 4-cresol, phenol, 2,4-DCP, 4-BP). The adsorption kinetics was best fitted with the Pseudo-second-order model. Langmuirand and Freundlich isotherm equilibriums were used to analyzed the adsorptions of dyes and phenols.
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