Removal Comparative Study for Cd(II) Ions from Polluted Solutions by Adsorption and Coagulation Techniques Using Moringa Oleifera Seeds

Document Type : Original Article

Authors

1 Faculty of Science, Physical Chemistry Dept. Al Azhar University, Egypt.

2 Medicinal and Aromatic Dept. Horti. Res. Institute, A. R. C., Egypt.

Abstract

The Moringa oleifera seed (MOS) was characterized by pHzpc, Fourier transform infrared spectroscopy (FT-IR), X-ray and scanning electron microscopy (SEM) in order to get an insight of the surface charge, functional groups, and morphology of the biosorbent, respectively. The MOS studies were conducted on Cd (II) with different parameters, such as solution pH, contact time, initial concentration of the pollutant and temperature were examined. Experimental results revealed an increase of the removal percentage of Cd (II) using adsorption compared with coagulation technique with increases of the initial Cd (II) concentration and contact time. However, an opposite trend was observed with an increase of the solution temperature and solution pHs value. The Freundlich isotherm linear equation are better described for the adsorption process and coagulation process for the removal of Cd (II) ions. By Comparing the thermodynamic parameters of Cd (II) removal, such as ∆H, ∆S and ∆G, distinct behaviours were observed, where adsorption process is positive values along all temperatures while coagulation process showed negative values (with exception of -∆G at 277 K). According to S* value, the adsorbent system are very high while the coagulation system are very low
Keywords; Moringa Oleifera seeds, Cd (II), Adsorption, Thermodynamics.

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History

  • Receive Date: 22 December 2018
  • Revise Date: 18 February 2019
  • Accept Date: 07 March 2019

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