In this work, we used the bark of eucalyptus grafted with acrylic acid (EAA) as an adsorbent for removing of Co2+ ions from aqueous solutions. EAA was characterized using Fourier Transformed Infrared Spectroscopy (FTIR), X-Ray diffraction (XRD), and bohemian method. The bulk density and the zero-charge point (pzch) were also determined. The results showed that eucalyptus grafted with acrylic acid (EAA) is rich in COOH and OH groups and pzch is acidic. We also valorized the Bark of Eucalyptus (EB) in the removing of Co2+ ions from aqueous solutions. The kinetic study showed that the extraction equilibrium of Co2+ ions by EB is reached after 40 min and the extraction process is expressed by the second-order kinetic model. The effect of Co2+ concentration and initial pH on the removal efficiency showed that the binding capacity increases with increasing in the pHi and the concentration of Co2+ ions and the maximum capacity is 55.55 mg/g. The mathematical modelling study of the adsorption of Co2+ ions on the BE showed that the adsorption process follows the Langmuir model. The kinetics of desorption is 8 times faster than the extraction and our material is regenerated with higher performance.
The present work aims the elimination of an organic dye Methylene Blue (MB) by adsorption on the polyacrylamide (PAAM) hydrogel. Several experiments series were then carried out in order to study the influence on the adsorption capacity of certain parameters such as the mass of the adsorbent, the pH, the contact time, the initial dye concentration and the temperature. The maximal capacity is 1620 mg/g it was obtained at T = 25°C, pH = 6, [BM] = 200 ppm and 0.013g of the adsorbent. The adsorption kinetics of the dye on the support is well described by the first-order model. The adsorption isotherms of the adsorbent/adsorbate systems studied are satisfactorily described by the Langmuir mathematical model. On the other hand, the thermodynamic study revealed that adsorption is spontaneous and endothermic.
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