title: Adsorption thermodynamic, kinetic and desorption studies of Pb2+ on carbon nanotubes.
abstract: 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.
authors.affiliation: Advanced Materials, School of Mechanical, Materials and Manufacturing Engineering, the University of Nottingham, University Park, Nottingham NG7 2RD, UK. yanhui.li@nottingham.ac.uk
authors.forename: Yan-Hui
authors.initials: YH
authors.lastname: Li
authors.forename: Zechao
authors.initials: Z
authors.lastname: Di
authors.forename: Jun
authors.initials: J
authors.lastname: Ding
authors.forename: Dehai
authors.initials: D
authors.lastname: Wu
authors.forename: Zhaokun
authors.initials: Z
authors.lastname: Luan
authors.forename: Yanqiu
authors.initials: Y
authors.lastname: Zhu
mesh_terms: 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*
chemical_list: D002413:Cations, Divalent; D037742:Nanotubes, Carbon; D007854:Lead