Adsorption of cobalt from aqueous solutions onto Bark of Eucalyptus

Abstract

<jats:p>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.</jats:p>

Removal of Cd(II), Cu(II), and Pb(II) by adsorption onto natural clay: a kinetic and thermodynamic study

“…The FTIR presented in Figure 2 shows a band that ranges between 3200 and 3800 cm -1 located at 3436 cm -1 corresponding to the stretching vibrations of the internal OH groups of water molecule [9,16] , the wide band at 1637 cm -1 and the band at 1381 cm -1 are attributed to the deformation of H 2 O [19,20]. The bands located at 693, 776, and 1005 cm -1 and the intense band located between 900 and 1200 cm -1 and centered at 1031 cm -1 correspond to the stretching vibrations of Si-O [9,[20][21][22][23][24]. Intense peaks were observed around 472 and 533 cm -1 attributable to the deformation of Si-O-Mg and Si-O-Al, respectively [25,26].…”

“…These techniques include chemical precipitation processes, flocculation, filtration, ion exchange, membrane processes, and adsorption [3][4][5][6][7][8]. The most used and studied method is adsorption method, due to its ease of use and the high availability and abundance of natural adsorbents [9][10][11][12]. Activated carbons are among the most widely used materials due to their high adsorption capacity [13], but they have numerous disadvantages, including high cost, intraparticle resistance in the adsorption process, low mechanical strength, and difficulty to regenerate.…”

Kinetic and thermodynamic study on adsorption of cadmium from aqueous solutions using natural clay

“…The FT-IR spectra (Figure 2) show a band that ranges between 3100-3700 cm -1 located at 3436 cm -1 due to the presence of the stretching vibrations of the internal OH groups of H2O molecule (23,24), the two bands at 1637 cm -1 and 1381 cm -1 are attributed to the deformation of H2O (25,26). The bands located at 693, 776, 1005 cm -1 , and 1031 cm -1 correspond to Si─O stretching vibrations (16,23,(26)(27)(28)(29). Intense peaks at 472 cm -1 and 533 cm -1 are attributable respectively to the deformation of Si─O─Mg and Si─O─Al (30).…”

Removal of methylene blue dye from aqueous solution using a superabsorbant hydrogel the polyacrylamide: isotherms and kinetic studies

“…Several treatments were used to reduce the harmful effects of these rejected effluents 9 . Traditional processes such as biological processes give unsatisfactory results 10 because of the composition of these releases in dyes and toxic materials which are hardly biodegradable. Adsorption remains one of the most used and easy to implement techniques 11,12 .…”