摘要
应用Boyd理论研究了活性炭吸附水中四氯乙烯(PCE)的吸附速率以及超临界CO2萃取PCE饱和活性炭的解吸附速率。结果表明,在0.5～48.0h内,吸附速率曲线具有直线相关关系,R2=0.9960,其吸附速率可用粒内扩散系数Di表示,Di=4.00×10-10cm2/s;在超临界CO2解吸附过程中,在1～5min内,时间与解吸附率存在直线相关关系,R2=0.9475,其解吸附速率用粒内扩散系数Di/SF表示,Di/SF=-5.19×10-5cm2/s,比Di大105倍,说明超临界流体具有优越的传输性能;用Boyd理论可粗略描述活性炭吸附—超临界CO2解吸附PCE的过程。
This reaserach applied Boyd＇s theory study of Perchlroethylene （PCE） in water using activated carbon and the study on the desoption rate of PCE with saturated activated carbon using supercritical CO2. The results showed the adsorption curve with a good liner relationship between water and time at 0.5-48.0 h, R2 =0. 996 0. The adsorption rate expressed by intrapartcle diffusion coefficient was Di = 4.00×10^10 cm2/s which agreed with Boyd＇s theory. For supercritical CO2, the desorption process also applied Boyd＇s theory. The results again showed a good linner relatioship between the desorption rate and time at 1-5 rain. R2 = 0. 947 5. The desorption with intraparrticle coefficient was Di/SF ： -5. 19×10^5 cm2/s. It indicated that this number is 10s times greater than Di. It also demon- strated that both the adsorption and the desorption process followed Boyd＇s theory. This scientific research data can be used to develop treatment techniques for PCE.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2008年第9期1-5,30,共6页
Environmental Pollution & Control
基金
国家科技支撑计划项目(No.2007BAC03A10)
甘肃省科技攻关重点资助项目(No.2GS054-A44-017)
关键词
四氯乙烯
活性炭
吸附速率
超临界CO2
解吸附速率
粒内扩散系数
perchloethylene
activated carbon
adsorption rate
supercritical fluid CO2
desorption rate
intra- particle diffusion coeffiecient
