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Adsorption thermodynamic, kinetic and desorption studies of Pb2+ on carbon nanotubes
February 2005
February 2005
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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.