期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 197, 期 -, 页码 389-396出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.09.100
关键词
Olaquindox; Multi-walled carbon nanotubes; Adsorption; Kinetics; Thermodynamics
资金
- National Natural Science Foundation of China [51178212]
- Natural Science Foundation of Liaoning Province, China [201102082]
Multi-walled carbon nanotubes (MWCNT) were employed for the sorption of olaquindox COLA) from aqueous solution. A detailed study of the adsorption process was performed by varying pH, ionic strength, sorbent amount, sorption time and temperature. The adsorption mechanism is probably the non-electrostatic pi-pi dispersion interaction and hydrophobic interaction between OLA and MWCNT. The adsorption efficiency could reach 99.7%, suggesting that MWCNT is excellent adsorbents for effective OLA removal from water. OLA adsorption kinetics were found to be very fast and equilibrium was reached within 2.0 min following the pseudo-second-order model with observed rate constants (k) of 0.169-1.048 g mg(-1) min(-1) (at varied temperatures). The overall rate process appeared to be influenced by both external mass transfer and intraparticle diffusion, but mainly governed by intraparticle diffusion. A rapid initial adsorption behavior occurred within a short period of time in this adsorption system. The sorption data could be well interpreted by the Langmuir model with the maximum adsorption capacity of 133.156 mg g(-1) (293 K) of OLA on MWCNT. The mean energy of adsorption was calculated to be 0.124 kJ mol(-1) (293 K) from the Dubinin-Radushkevich adsorption isotherm. Moreover, the thermodynamic parameters showed the spontaneous, exothermic and physical nature of the adsorption process. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据