2024 : 6 : 22
Ehsan Salehi

Ehsan Salehi

Academic rank: Professor
ORCID: https://orcid.org/0000-0003-4409-1242
Education: PhD.
ScopusId: 25643697300
Faculty: Engineering
Address: Arak University
Phone: 086-32625020


Ethylenediamine-Functionalized Graphene Oxide Nanosheets for Modifying Chitosan/Polyvinyl Alcohol Membrane Adsorbents for RB19 Removal from Wastewater
Graphene oxide; Ethylenediamine; Membrane adsorbent; Adsorption, Optimization.
Journal Industrial & Engineering Chemistry Research
Researchers Fahimeh Ghaffari ، Ehsan Salehi ، Farhad Heidary


Graphene oxide (GO) was covalently functionalized with ethylenediamine (ED-GO) and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, and field emission scanning electron microscopy techniques. Afterward, ED-GO-embedded chitosan/polyvinyl alcohol membrane adsorbents (CP/ED-GO) were fabricated by incorporating different amounts (0−1 wt %) of ED-GO, and the resultant membrane adsorbents were applied for the adsorption of reactive blue 19 dye (RB19) from water. According to the batch adsorption results, the adsorbent containing 0.25 wt % ED-GO possessed the best performance in RB19 removal. Adsorption of RB19 dye onto the CP/EDGO-0.25 wt % membrane was also optimized using the response surface methodology. The solution pH, initial dye concentration, and adsorbent mass were selected as independent variables. The dye removal of 95% was achieved under the optimized conditions, close to the experimentally measured value, indicating the reliability of the optimization. Isothermal adsorption experiments revealed that RB19 dye adsorption onto CP, CP/ED-GO-0.25 wt %, and CP/GO-0.25 wt % could be well described by the Freundlich isotherm model. The adsorption kinetic of RB19 dye using CP, CP/ED-GO-0.25 wt %, and CP/GO-0.25 wt % membrane adsorbents followed the pseudo-second-order kinetic pattern. The adsorption capacity values of 333.331 , 303.03, and 256.41 mg g−1 were obtained for CP/ED-GO-0.25 wt %, CP, and CP/GO membrane adsorbents, respectively. In summary, the CP/ED-GO-0.25 wt % membrane was found to be a promising adsorbent for wastewater decoloring.