Kinetic study for adsorption of para nitroaniline (PNA) on Bentonite clay surface

Abstract

In this study, the removal of para nitroaniline (PNA) from aqueous suspension
of bentonite was investigated as a function of pH, concentration and temperature.
Adsorption process was attained to the equilibrium within 65 minutes which
investigated by using uv-visible spectrophotometer technique.
The adsorbed amount of para nitroaniline (PNA) decreased as the temperature
and pH increased .
The Dubinin-Rasdushkevich (D-R) isotherm equation was applied to the data
and values of parameters of this isotherm equation was calculated.
The mean energy of adsorption Eads, was also calculated from the adsorption
energy constant K/ . It’s Value determined from the D-R isotherm equation.
The rate constant for adsorption and activation energy value for the adsorption
process was calculated at neutral pH.