Removal of Chromium ions from polluted water by highly active surface ZnO/ Activated Carbon: Kinetic and thermodynamic model

Document Type : Research Paper


1 Collage of SciencAnesthesia Techniques Department, Al-Mustaqbal University College, Babylon, Iraq e/ Baghdad University/Biotechnology dep. Iraq

2 Al-Nisour University College/Baghdad/Iraq

3 Medical Laboratory Techniques Department, Dijlah University College, Baghdad, Iraq

4 Al-Manara College For Medical Sciences/ (Maysan)/Iraq

5 College of technical engineering, The Islamic University, Najaf, Iraq. Department of Pharmacy, Osol Aldeen University College, Baghdad, Iraq

6 Medical physics department, Hilla university college, Babylon, Iraq

7 Department of Pharmacy, Al-Zahrawi University College, Karbala, Iraq

8 Al-Esraa University College, Baghdad, Iraq


In this study, Activated carbon was prepared by simple method using stem a Punica granatum. The nano ZnO was prepared by Silybum marianum leaves extract and zinc sulfate (ZnSO4) (source of zinc oxide nanoparticles) with calcination at temperature at 600 ᵒC. The activated carbon and nano ZnO as a binary composite were prepared by mixing a certain different ratio of activated carbon and zinc oxide nanoparticles by ultrasonicification. FTIR spectroscopy, Field-Emission Scanning Electron Microscope techniques (FESEM) and X-ray diffraction were used to characterize the synthesized compounds. The experimental data were fitted into two kinetic models: pseudo-first order and pseudo-second order. It was observed that pseud-second order describe the adsorption better than pseudo-first order kinetic models. Negative values of the thermodynamic functions (ΔG, ΔH, ΔS) of the adsorption declared that it is spontaneous, exothermic and the position of the adsorbed Cr+3 ions is more regularly after the adsorption process v v