Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes.
The adsorption kinetics, isotherms and thermodynamic of atrazine on multiwalled carbon nanotubes (MWCNTs) containing 0.85%, 2.16%, and 7.07% oxygen was studied. Kinetic analyses were performed using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The regression results showed that the pseudo-second-order law fit the adsorption kinetics. The calculated thermodynamic parameters indicated that adsorption of atrazine on MWCNTs was spontaneous and exothermic. Standard free energy (DeltaG(0)) became less negative when the oxygen content of MWCNTs increased from 0.85% to 7.07% which is consistent with the low adsorption affinity of MWCNTs for atrazine.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Guang-Cai
GC
Chen
Xiao-Quan
XQ
Shan
Yi-Quan
YQ
Zhou
Xiu-e
XE
Shen
Hong-Lin
HL
Huang
Shahamat U
SU
Khan
D000327:Adsorption; D001280:Atrazine / Q000737:chemistry / Q000302:isolation & purification*; D006540:Herbicides / Q000737:chemistry / Q000302:isolation & purification; D007700:Kinetics; D037742:Nanotubes, Carbon; D013816:Thermodynamics
D006540:Herbicides; D037742:Nanotubes, Carbon; D001280:Atrazine