三种VOCs物性对其在活性炭上吸附行为的影响  

Effects of properties of three VOCs on activated carbon adsorption

作　　者：李立清[1] 宋剑飞[1] 孙政[1] WANG Shaobin 姚小龙[1] 刘伟[1] 刘峥[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]Department of Chemical Engineering,Curtin University of Technology,GPO Box U1987,Perth,WA 6845,Australia

出　　处：《化工学报》2011年第10期2784-2790,共7页CIESC Journal

基　　金：国家自然科学基金项目(20676154,20976200)~~

摘　　要：为了探讨VOC物性对活性炭吸附行为的影响,对活性炭表面物化性质进行了表征。并以甲苯、丙酮、二甲苯为吸附质,在同等实验条件下进行了固定床吸附实验。实验结果显示活性炭对3种VOCs的吸附量为二甲苯>甲苯>丙酮。将实验结果与VOC物性进行关联分析,结果表明:活性炭对有机气体的吸附量随着吸附质的分子量、分子动力学直径、沸点、密度的增大而增大,且呈现良好的正线性关系;而吸附质的极性指数和蒸气压则与活性炭吸附量呈现出相反的关系;3种活性炭对吸附质吸附能的排序均为二甲苯>甲苯>丙酮。To explore the effects of VOC properties on activated carbon adsorption, physical and chemical properties of activated carbon including surface area, pore volume, pore size distribution and surface functional groups were characterized. Three VOCs （toluene, acetone and xylene） were chosen as adsorbate. Fixed-bed adsorption experiments were carried out under the same conditions. Correlation analysis between experimental results and VOC properties was conducted. The experimental results show that adsorption capacity is xylene〉 toluene〉 acetone. The adsorption capacity of the activated carbon increases with molecular weight, molecular dynamic diameter, boiling point, and density of VOC, and the correlation is a linear relationship, but the relationship between polarity index, vapor pressure and adsorption capacity is opposite. The adsorption energy of these three types of activated carbon for VOCs is xylene〉 toluene〉 acetone.

关 键 词：活性炭 吸附 VOC物性 吸附能 

分 类 号：O647.31[理学—物理化学]