A DRIED compressed coffee residue was calcinated at a temperature of 400 0 C for 4 hours.It was analyzed quantitatively and qualitatively by using X-Ray Fluorescence (XRF) spectroscopy. The coffee carbon surface was modified with oleum. The surface properties of the sample were studied by using the FTIR spectroscopy after each treatment resulting new different peaks that indicate the modification with oleum. Besides, other peaks that indicate the adsorption of nicotine on its surface were obvious. The concentrations of nicotine in the studied solutions were measured by using the spectrophotometry, the nicotine adsorption on the studied adsorbent followed the pseudo second-order model. The effect of nicotine concentration was also studied at the temperatures of 20-30-35-40 0 C; an increase of the nicotine adsorption was noticed with the increase of the initial concentration at each of the studied temperatures; the adsorption curves fitted the Langmuir and Freundlich isotherms models. In addition, the thermodynamic parameters of the surface adsorption interaction ∆G 0 , ∆H 0 , ∆S 0 were determined, the resulting values showed that the interaction is endothermic and the adsorption is of chemical nature. Besides, a mechanism for the adsorption of nicotine on modified compressed coffee residue carbon (CACS) was suggested presuming the participation of the two nitrogen atoms in the polar nicotine molecule.
The boiled tea leaves residual was modified with oleum of weight 1:1 to prepare an adsorbent that is capable to adsorb nicotine on its surface. The surface properties of the sample were studied by using the FT-IR spectroscopy after each treatment resulting obvious peaks that indicate the modification of the sample with oleum and the adsorption of nicotine on its surface. The concentration of nicotine in the prepared solutions was measured by the use of spectral analysis. The change of nicotine΄s adsorption was studied with the change of time. An increase in the adsorbed amount was noticed until the equilibrium was reached after 24hours. In addition, an increase of the adsorbed amount of nicotine with the increase of its initial concentration was observed at the room temperature. The experimental data corresponded with adsorption models of Langmuir, Freundlish and Temkin, besides, a mechanism of the adsorption of nicotine was suggested to occur with the participation of the two nitrogen atoms.
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