Equilibrium and kinetic studies of the sorption process showed that the Freundlich isotherm model and pseudo-second-order kinetic model can better describe the equilibrium and kinetic behavior of the sorption process.  Also, the results of the thermodynamic study showed that the sorption process is favorable (ΔS° =  - 34.2 kJ/mol·K for Cr(VI) and - 144.6 kJ/mol·K for NB), spontaneous (ΔG° < 0), and exothermic (ΔH° =  - 27.99 kJ/mol for Cr(VI) and - 64.2 kJ/mol for NB).  Furthermore, the reusability study indicated that the composite can be used in five reuse cycles without significant decrease in its efficiency. 
THERM