Preparation and adsorption performances of mesopore-enriched bamboo activated carbon

Abstract

Activated carbon with high specific surface area and considerable mesopores was prepared from bamboo scraps by phosphoric acid activation. The effect of activation conditions was studied. Under the conditions of impregnating bamboo with 80% H₃PO₄ at 80°C for 9 days and activation at 500°C for 4 h, the prepared activated carbon had the highest mesopore volume of 0.67 cm³/g, a specific surface area of 1567 m²/g, and the mesopore ratio reached 47.18%. The study on adsorption isotherms of CH₄, CO₂, N₂ and O₂ on the activated carbon were carried out at 298 K. The considerable difference in the adsorption capacity between CO₂ and the other gases was observed, which would be of interest for the adsorptive separation/purification of gaseous CO₂ from its mixtures, especially from mixtures with N₂ and/or O₂.

Keywords

bamboo / activated carbon / preparation / adsorption