Effects of Air-phosphoric Acid Activation on Pore Structure and Adsorption Property of Mesoporous Carbon From Hemp Stem

摘要

Mesopore activated carbons were prepared using hemp stem as feedstock by air-phosphoric acid activation method. The crystallite size of hemp stem-based mesoporous carbon is small, and its pores is larger. The phosphoric acid solution concentration has a signification effect on pore structure and adsorption property of mesopore activated carbons from hemp stem. The mesopore activated carbon attained at phosphoric acid solution concentration of 50% exhibits a maximum BET (Brunauer Emmett and Teller) specific surface area of 1351 m~2/g, total pore volume of 1.21 cm~3/g, mesopore pore volume of 0.90 cm~3/g and a mesopore fraction of 74.4%. And the resulting carbon has smaller crystal size, developed pore structure, wider pore size distribution.