中南大学学报（自然科学版）2012，Vol.43Issue(4)：1574-1583,10.
活性炭孔隙结构在其丙酮吸附中的作用
Role of pore structure of activated carbon in adsorption for acetone
摘要
Abstract
To explore the effects of activated carbon pore structure on its adsorption performance, the chosen activated carbon samples were characterized by nitrogen adsorption isotherms, scanning electron microscopy and Fourier transform infrared speetroscopy. Acetone as adsorbate, the static and dynamic adsorption experiments were made at 298.15 K. The adsorption equilibrium, adsorption kinetics and adsorption energy of acetone on activated carbon were discussed. The results show that the adsorption capacity for acetone is positive correlation to both total pore volume and specific surface area of activated carbon. Pore volume and acetone adsorptive capacity show a good linear relation when pore diameter is between 1.67-2.22 nm, and linear slope increases with the increase of acetone concentration. The adsorption behavior obeys Langmuir adsorption isotherm model and pseudo-second-order kinetic model. Pore is the major constraints of adsorption rate, specifically, at fast adsorption stage, adsorption rate is mainly restricted by micropore and mesopore, while at infra-particle diffusion stage and the end stage, micropore and mesopore is the main constraint of adsorption rate, respectively. Acetone surface coverage on activated carbon is the interaction results between acetone molecules and adsorption site. The activated carbon, pore structure different, adsorption site distribution will be different, the smaller the surface coverage, the higher the adsorption energy is, indicating that activated carbon pore structure can influence adsorption energy.关键词
活性炭/丙酮/孔结构/相关性/吸附动力学Key words
activated carbon(AC)/ acetone/ pore structure/ correlation/ adsorption kinetics分类
化学化工引用本文复制引用
刘伟,李立清,姚小龙,孙政,刘峥..活性炭孔隙结构在其丙酮吸附中的作用[J].中南大学学报（自然科学版）,2012,43(4):1574-1583,10.基金项目
国家自然科学基金资助项目(20976200) （20976200）
