| Περίληψη: | At the present thesis, the integrated approach of the fibrous clay minerals application as NO3--N and NH4+-N adsorbents was examined. Both palygorskite (Pal) and sepiolite (Sep) were selected as human and environmental- friendly materials to remove exceeded concentrations of NO3- -N and NH4+-N from contaminated aquifers as adsorbents, whereas their potential reusability (saturation test), leaching rate of adsorbed contaminants (desorption study) and further exploitation (hydroponic cultivations) to avoid secondary pollution, were extensively discussed. Also, to gain enhanced adsorption efficiencies of the pollutants mentioned, both Pal and Sep underwent acid (HCl 1M) and thermal (400 oC) treatment. The specific modification techniques were selected due to their simplicity and because they are environmentally friendly. The optimal conditions for the N- ions removal was determined via batch kinetic experiments series (effect of adsorbent dosage, initial pollutant concentration, pH) and fixed- bed reactors under various continuous flow rates. The insight of removal mechanism was also determined via characterization methods X-Ray Diffraction, Scanning Electron Microscopy, N2 adsorption- desorption isotherms, Fourier-Transform Infrared Spectroscopy, Thermal Gravimetric Analysis, Ζeta potential and X-Ray Fluorescence techniques and molecular simulations as well.
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