摘要
以互花米草为原料,经过碳化、KOH活化两步法制备了低成本、高比表面的微孔活性炭SAAC.通过静态实验研究了活性炭SAAC对水溶液中对硝基苯胺的吸附特性,并从动力学角度探讨了吸附机理.结果表明,微孔活性炭SAAC对对硝基苯胺吸附动力学数据符合准二级方程,吸附速率在前25min由内扩散控制,而后由膜扩散与内扩散共同控制.Freundlich方程能更好地描述对硝基苯胺在活性炭SAAC上的等温吸附行为;在15℃时,活性炭SAAC对对硝基苯胺的Langmuir最大吸附量为719mg/g.
Low-cost activated carbon was prepared from Spartina alterniflora from a two-step thermo-chemical process by KOH activation.The adsorption equilibrium and kinetic behavior of p-nitroaniline onto the carbon was investigated by conducting a series of batch adsorption experiments,and adsorption mechanism was discussed from kinetic point of view.The pseudo-second-order model was found to explain the adsorption kinetics most effectively.It was also found that the pore diffusion played an important role in the adsorption,and intra-particle diffusion was the rate-limiting step at the first 25 min for the temperatures of 15,25 and 35 ℃.The Freundlich isotherm was found to best describe the experimental data.The maximum adsorption capacity of p-nitroaniline was found to be 719 mg/g for initial p-nitroaniline concentration of 200 mg/L at 15℃.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2010年第2期174-179,共6页
China Environmental Science
基金
"十一五"国家水专项资助项目(2008ZX07101-005)
关键词
KOH活化
对硝基苯胺
微孔活性炭
吸附机理
KOH activation
p-nitroaniline
microporous carbon
adsorption mechanism
