摘要
研究了竹炭和碳纳米管从水溶液中吸附双酚A及4-硝基苯胺的动力学行为。结果表明,竹炭对双酚A和4-硝基苯胺的平衡吸附量qe均随着初始浓度和温度的增加而升高,相同条件下,qe大小为:4-硝基苯胺>双酚A;碳纳米管对双酚A和4-硝基苯胺的qe也随着初始浓度增加而增大,但随着溶液温度升高而减小,相同条件下,qe大小为:4-硝基苯胺<双酚A;吸附过程均符合伪二级动力学方程,颗粒内扩散过程是竹炭吸附速率控制的重要因素,同时还受颗粒外扩散过程的控制,但不是碳纳米管吸附速率控制的重要因素;竹炭、碳纳米管对双酚A和4-硝基苯胺的吸附活化能都比较低,依次为19.41,4.37,6.06,27.33 kJ/mol,表明吸附过程以物理吸附为主。
The adsorption kinetics of bamboo charcoal and carbon nanotubes (CNT)for bisphenol A (BPA) and 4-nitroaniline (4NN) from aqueous solution was studied. The results show that the equihbri- um adsorbing capacity( qe ) of BPA and 4NN increases with the increase of initial concentration or temperature. On the same condition, the order of qo is : 4-nitroaniline 〉 bisphenol A. The equilibrium adsorbing capacity of BPA and 4NN onto CNT increases with the increase of initial concentration or decrease of tem- perature, using the same condition ,the order of qe is :4-nitroaniline 〈 bisphenol A. The adsorption proces- ses follow a pseudo second-order kinetic rate equation, the adsorption rate is not only controlled by intra- particle diffusion but also by extra-particle diffusion. However, for CNT, intra-particle diffusion is not the rate-controlling step. The adsorption activation energy of bisphenol A and 4-nitroaniline onto bamboo charcoalnd and CNT is low (19.41,4.37,6.06,27.33 kJ/mol respectively) ,which indicates that it belongs to physics adsorption.
出处
《应用化工》
CAS
CSCD
2009年第11期1575-1578,1590,共5页
Applied Chemical Industry
基金
浙江省自然科学基金2006年资助项目(Y405377)
浙江省教育厅资助项目(20070512)
关键词
竹炭
碳纳米管
双酚A
4-硝基苯胺
吸附动力学
bamboo charcoal
carbon nanotubes
bisphenol A
4-nitroaniline
adsorption kinetics
作者简介
作者简介:朱仙弟(1965-),男,浙汀台州人,台州学院副教授,从事无机材料研究。电话:0576—85231211,E-mail:xxdyxy@tzc.edu.cn