2种改性活性炭对甲苯吸附性能的对比研究  

Comparison of Toluene Adsorption with Two Kinds of Modified Activated Carbon

作　　者：曹晓强[1] 黄学敏[1] 刘胜荣[2] 赵圣伟[1] 庄剑恒[1] 冯燕[1] 马广大[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西北水资源与环境生态教育部重点实验室 [2]青岛理工大学经贸学院,青岛266520

出　　处：《环境科学》2008年第10期2868-2873,共6页Environmental Science

基　　金：陕西省自然科学基金项目(2006E210);陕西省教育厅专项科研计划项目(06JK269)

摘　　要：利用微波、电炉加热对活性炭进行改性,并测定了改性前后不同种类活性炭对甲苯的吸附性能、表面酸碱官能团含量以及比表面积.结果表明,对于微波改性,随着改性温度升高,活性炭对甲苯的吸附量逐渐增大,表面碱性官能团含量也相应增加,比表面积相应减小.改性温度850℃时活性炭吸附甲苯性能最高,650℃与450℃改性后活性炭吸附甲苯的性能相差不大.电加热改性也具有类似的趋势,但对甲苯的吸附性能总体低于微波改性.扫描电镜表征显示,热改性去除了活性炭孔道内的杂质,使活性炭内部孔道更加通畅,有利于提高吸附甲苯的能力,但温度升高同样存在炭骨架收缩,孔道变窄的弊端.微波加热和电炉加热在原理和热传递方向上的不同,是导致改性结果之间差别的关键问题.Granular activated carbon （GAC） was modified by microwave irradiation and electrical heating. The characters and toluene adsorption capacity of modified GAC were studied. The results showed that for microwave heating, with the temperature increasing, the activated carbon＇s ability of toluene adsorption and content of the surface basic functional group were increased, specific surface area was decreased. After heated at 850℃, GAC had the highest ability for toluene adsorption, at 650℃ and 450℃, the ability for toluene adsorption of GAC were similar. For the electrical heating, the same results were obtained. But the GAC modified with electrical heating had lower capacity of toluene adsorption than microwave modified GAC. The SEM photos showed that thermal modification made the porous structure of modified GAC smoother than original GAC, but the structure of GAC shrink at high temperature. Finally, all the experimental data and SEM photos were analyzed; it indicated that due to the difference of heating mechanism and heat transmission direction, the modified GAC have different characters.

关 键 词：活性炭 微波 电加热 改性 吸附 甲苯 

分 类 号：X701.7[环境科学与工程—环境工程]