Preparation and characterization of activated carbons produced from oil palm empty fruit bunches

Activated carbons were prepared by activating oil palm empty fruit bunches (EFB) using various chemicals including H3PO4, KOH or ZnCl2 and were characterized by elemental analysis, nitrogen and methylene blue adsorption. The effect of the pre-treatment of EFB by NaOH was also investigated. Among all samples, EFB pre-washed with NaOH and then activated with ZnCl2 showed the greatest maximum adsorption capacity (357 mg/g) and BET specific surface area (1265 m2/g). The experimental data of all adsorbents were well fitted to the Langmuir isotherm model and pseudo-second-order kinetics model. This study demonstrated that ZnCl2 activation was the best way to obtain an activated carbon, and that NaOH pre-washing was effective as well for developing mesopores in EFB activated by H3PO4 and ZnCl2

Relationship between helium degassing of cattle-manure-compost adsorbents and copper ions removal

This work was aimed to investigate the effect of helium degassing of cattle-manure-compost (CMC) based activated carbons on the adsorptive removal of copper ions from aqueous solution. Degassing temperatures were 500°C, 800°C and 1000°C. Activated carbons were characterized according to surface chemistry and pore structures. Adsorption of copper ions was carried out using the conventional bottle-point technique to which the equilibrium data were correlated to Langmuir and Freundlich models. Results indicated that the uptake of copper ions could be well characterized by Langmuir model. It was found that the adsorption of copper ions decreased with significant decrease in surface area as a result of helium degassing at higher temperature. The increase of electron density on graphene layers offered higher affinity towards copper ions at lower equilibrium concentration. It was inferred that copper ions favorably adsorbed on mesopores at lower equilibrium concentration and switched to micropores at higher equilibrium concentration

国立大学と地域交流 : 教員調査と有識者調査の結果から

日本教育社会学会第51回大会, 1999年(東京大学), 研究発表Ⅱ Ⅱ-3部会 高等教育(2