Adsorption thermodynamic, kinetic and desorption studies of Pb2+ on carbon nanotubes.
Adsorption thermodynamics of Pb2+ on carbon nanotubes has been studied at various temperatures of 280, 298 and 321 K and the thermodynamic parameters, such as equilibrium constant (K0), standard free energy changes (DeltaG0), standard enthalpy change (DeltaH0) and standard entropy change (DeltaS0), have been obtained. A pseudo-second-order rate model has been employed to describe the kinetic adsorption processes. Desorption studies reveal that Pb2+ can be easily removed from carbon nanotubes by altering the pH values of the solution using both HCl and HNO3, indicating that carbon nanotubes are a promising absorbent for wastewater treatment.
Li
Yan-Hui
YH
Advanced Materials, School of Mechanical, Materials and Manufacturing Engineering, the University of Nottingham, University Park, Nottingham NG7 2RD, UK. yanhui.li@nottingham.ac.uk
Di
Zechao
Z
Ding
Jun
J
Wu
Dehai
D
Luan
Zhaokun
Z
Zhu
Yanqiu
Y
D000327:Adsorption; D002413:Cations, Divalent; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013816:Thermodynamics; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D002413:Cations, Divalent; D037742:Nanotubes, Carbon; D007854:Lead