TY - JOUR
T1 - Multiwalled carbon nanotubes as adsorbents for removal of herbicide diuron from aqueous solution
AU - Deng, Jing
AU - Shao, Yisheng
AU - Gao, Naiyun
AU - Deng, Yang
AU - Tan, Chaoqun
AU - Zhou, Shiqing
AU - Hu, Xuhao
PY - 2012/6/15
Y1 - 2012/6/15
N2 - The adsorption of diuron onto as-prepared and oxidized multiwalled carbon nanotubes (MWCNTs) from aqueous solution has been studied through batch experiments, in which the effect of contact time, temperature, pH and coexisting Cu 2+ were investigated. The adsorption performance of diuron onto MWCNTs fitted the pseudo-second-order model and apparent equilibrium was reached within 1h. The experimental data showed good correlation with Freundlich, Langmuir and Polanyi-Manes models in the range of experimental concentrations, but followed Polanyi-Manes model most appropriate. The calculated thermodynamic parameters showed adsorption of diuron onto MWCNTs was exothermic and spontaneous. Except for the introduction of oxygen-containing functional groups onto the surfaces of MWCNTs, the oxidized treatment of as-prepared MWCNTs can also increase the surface area and the pore volume, which resulted in the increase adsorption of diuron in this study. The adsorption of diuron was found to be pH dependent, and more adsorption was observed under neutral and basic conditions. The presence of Cu 2+ has no significant effect on the adsorption of diuron onto as-prepared MWCNTs, on the contrary, the presence of Cu 2+ can greatly decrease the adsorption of diuron onto oxidized MWCNTs. In addition, competitive adsorption was greater at higher than at lower diuron concentrations.
AB - The adsorption of diuron onto as-prepared and oxidized multiwalled carbon nanotubes (MWCNTs) from aqueous solution has been studied through batch experiments, in which the effect of contact time, temperature, pH and coexisting Cu 2+ were investigated. The adsorption performance of diuron onto MWCNTs fitted the pseudo-second-order model and apparent equilibrium was reached within 1h. The experimental data showed good correlation with Freundlich, Langmuir and Polanyi-Manes models in the range of experimental concentrations, but followed Polanyi-Manes model most appropriate. The calculated thermodynamic parameters showed adsorption of diuron onto MWCNTs was exothermic and spontaneous. Except for the introduction of oxygen-containing functional groups onto the surfaces of MWCNTs, the oxidized treatment of as-prepared MWCNTs can also increase the surface area and the pore volume, which resulted in the increase adsorption of diuron in this study. The adsorption of diuron was found to be pH dependent, and more adsorption was observed under neutral and basic conditions. The presence of Cu 2+ has no significant effect on the adsorption of diuron onto as-prepared MWCNTs, on the contrary, the presence of Cu 2+ can greatly decrease the adsorption of diuron onto oxidized MWCNTs. In addition, competitive adsorption was greater at higher than at lower diuron concentrations.
KW - Adsorption
KW - Cu
KW - Diuron
KW - Multiwalled carbon nanotubes (MWCNTs)
KW - PH
KW - Polanyi-Manes model
UR - http://www.scopus.com/inward/record.url?scp=84862548208&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2012.04.051
DO - 10.1016/j.cej.2012.04.051
M3 - Article
AN - SCOPUS:84862548208
SN - 1385-8947
VL - 193-194
SP - 339
EP - 347
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -