Kinetic and thermodynamic studies on the removal of Cr (VI) ions from aqueous solution using n-ZVI
Eman. A. Kamar ,Hisham. M. Aly, Dalia. A. Amen
We have studied the removal of Cr (VI) ion from aqueous solution at different condition using n-ZVI. The n-ZVI was prepared via borohydrate reduction under inert atmosphere. The effect of temperature, concentration and loading quantities on kinetic and equilibrium of chromium ion removal using n-ZVI were thoroughly examined. The prepared n-ZVI was characterized by several techniques including X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). The adsorption capacity was found to be 40 mg g-1 at pH 3.9 and 300 K. The pseudo second order was found to be the best fitting kinetic model. The adsorption activation energy was calculated and given to be 41.56 kJ mol-1. The thermodynamic parameters ∆Go, ∆Ho and ∆So, were also calculated. The results indicate the endothermic and spontaneous nature of the adsorption process.