CO2高温活化活性炭材料对苯酚的吸附行为研究  

Adsorption of phenol on CO_2-treated activated carbon

作　　者：赵瑞东[1] 刘凤玲[1] 郑寿荣[1] 万海勤[1] 许昭怡[1] 

机构地区：[1]污染控制与资源化研究国家重点实验室,南京大学环境学院,江苏南京210093

出　　处：《环境污染与防治》2010年第10期33-36,共4页Environmental Pollution & Control

基　　金：国家“973计划”课题(No.2008CB418003);国家自然科学基金资助项目(No.40402022、No.20877039);江苏省六大人才高峰项目及国家科技支撑计划项目(No.2006BAC02A15);南京大学大型贵重仪器设备开放测试基金资助

摘　　要：以CO2为活化气体,在高温条件下对国产椰壳活性炭进行活化。研究了活化前后的活性炭在不同温度和pH等条件下对水溶液中苯酚的吸附行为。结果表明,活性炭经活化后,微孔体积和中孔体积增加,吸附容量明显提高;苯酚在活性炭上的吸附符合Freundlich吸附等温方程和准二级反应动力学方程;在一定范围内降低温度有利于吸附的进行;在pH为2～8时,吸附效果较好;在pH>9时,吸附效率明显降低。CO2-treated activated carbon from domestic coconut was prepared by calcination in high temperature at CO2 atmosphere,the adsorption capacity of raw activated carbon and CO2-treated activated carbon for phenol was investigated and compared.The results showed that the surface characteristics of activated carbon were significantly improved after CO2 activation,with the BET surface area increased from 627.22 m2/g to 822.71 m2/g,micropore volume and mesopore volume increased by 28.6% and 38.9% respectively.The Freundlich model can be used to describe the process of phenol adsorption on activated carbon and the adsorption data were well fitted by pseudo second order equation.The adsorption capacities,which increased with decreasing temperature,were perfect when the solution pH was 2-8,when pH〉9 the adsorption efficiency decreased gradually for the dissociated phenol was not conductive to adsorption process.

关 键 词：活性炭 CO2活化 苯酚 吸附 

分 类 号：X703[环境科学与工程—环境工程]