Abstract:

 To enhance absorption property of activated carbon and reduce energy consumption of preparation technology, we address the impact of ultralow temperature pretreatment on quality and preparation technology of activated carbon. We employ liquid nitrogen to pretreat coconut shell at ultralow temperature. Through rapid temperature rise, we prepare activated carbon at 600 ℃ whose specific surface area surpasses that of nonpretreatment activated carbon at 800 ℃. The specific surface area of activated carbon of the coconut shell increases to 2300 m2/g from 1 600 m2/g, and its micropore volume increases to 0.92 cm3/g from 0.67 cm3/g. Results show that ultralow temperature pretreatment has significant positive effect to quality improvement and reduction of energy consumption of activated carbon. The research provides reference for functional development and  the improvement of surface structure of activated carbon.

Key words: activated carbon, rapid temperature rise, ultra-low temperature