关键词: 油茶壳, 微孔活性炭, 活化, 制备, 孔结构

Abstract:

Micropore activated carbon was prepared from Camellia oleifera shell by carbonization and KOH activation. The influences of activation temperature, activation time and alkali-carbon ratio on the adsorption iodine value and yield of micropore activated carbon were investigated, and the preparation conditions were optimized by orthogonal test. The results showed that micropore activated carbon with the optimal adsorption iodine value were prepared under activation temperature 800 ℃, activation time 180 min and alkali-carbon ratio 3.5:1. The adsorption iodine value and yield of micropore activated carbon obtained under the optimized conditions were 3 221 mg/g and 51.2%, respectively. The adsorption and desorption isotherms of nitrogen were determined by specific surface area and pore analyzer. The specific surface area calculated by Brunauer-Emmett-Teller(BET) method was 1 755.72 m²/g, and the average pore size and total pore volume were 2.15 nm and 0.328 cm³/g, respectively. Micropore volume accounted for 55.8% of total pore volume. SEM analysis showed that there were a lot of pore structures on the surface of activated carbon. FT-IR analysis showed that the activation process promoted the pyrolysis of —CH₃ and —OH, and the oxygen-containing functional groups were preserved in the activated carbon.

Key words: Camellia oleifera shell, micropore activated carbon, activation, preparation, pore structure