The current inquiry aimed at using core-shell Fe3O4@Humic acid/montmorillonite nanocomposites for... more The current inquiry aimed at using core-shell Fe3O4@Humic acid/montmorillonite nanocomposites for removing methyl orange dye from an aqueous solution. The samples were characterized by FT-IR, TEM, SEM, XRD, BJH, and BET analytical methods. The efficiency removal has been utilized for 300 min reaction time using the response surface methodology by a design of five-factor-three-level central composite. The adsorption kinetics followed the pseudo-second-order rate kinetic model, showing an acceptable correlation (R2 > 0.99). Langmuir, Freundlich, Temkin, Dubinin–RadushKevich, and Harkins–Jura isotherms were utilized for the analysis of the equilibrium data. Also, we have estimated standard Gibbs free energy (∆G°), standard enthalpy (∆H°), standard entropy (∆S°), and the activation energy (Ea). The findings of this investigation suggest that the absorption of methyl orange on the adsorbent pursues the Frondelich isothermal formulation. The ∆G° values obtained showed physical absorpti...
... is probably a function of the low surface coverage of appropriately spaced Cr 3+ sites for bi... more ... is probably a function of the low surface coverage of appropriately spaced Cr 3+ sites for bidentate ... conducted over CrCl 3 to investigate the possibility of the chlorination reaction on this catalyst. The chromium(III) oxide (0.2 g) was loaded in the microreactor; it was heated under ...
In this paper, human hair, as a waste material, was utilized in order to prepare keratin nanopart... more In this paper, human hair, as a waste material, was utilized in order to prepare keratin nanoparticles. The characterization of keratin nanoparticles was performed applying Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-Ray diffraction (XRD). The average diameter of keratin nanoparticles was found to be 63.7 nm, using particle size analyzer. Subsequently, the keratin nanoparticles were employed for Cr (VI) ions adsorption. The batch experiment was carried out to find the optimum conditions; i.e. contact time, pH, adsorbent dose and initial concentration of Cr (VI) ions. The adsorption capacity was extremely pH-dependent, and the maximum adsorption of Cr (VI) happened in the acidic pH range. The results demonstrated that the maximum adsorption capacity, obtained in acidic pH, was 161.29 mg/g. The equilibrium data were well fitted by Freundlich isotherm. The kinetic studies were performed with the Lager...
This research is a comparative study of the surface chemistry and adsorptive characteristics of t... more This research is a comparative study of the surface chemistry and adsorptive characteristics of titanium dioxide nanoparticles on activated carbon (Ac/TiO2) and chitosan loaded on activated carbon (Ac/TiO2/Ch). For the first time, using three-fold composite of activated carbon prepared from Persian mesquite seeds, chitosan, and nanoparticles of titanium dioxide as an effective adsorbent for removing safranin o. X-ray Diffraction (XRD), scanning electron microscope (SEM), BET analysis, and thermogravimetric analysis (TGA) have been used to determine and confirm physicochemical variation during preparing and modifying activated carbon on both adsorbents. The results of XRD, SEM, and TGA are shown essential changes happened in porosity of the surface after the modification process. The Ac/TiO2 and Ac/TiO2/Ch adsorbents have been used to /remove safranin o as a cationic azo dye from an aqueous solution. The experimental data at different conditions were correlated by some famous kinetic...
ALKHAS;The Journal of Environment, Agriculture and Biological Sciences, 2020
In the present work nano-hydroxyapatite (n-HAp)/Carboxymethyl Cellulose (CMC) composite was synth... more In the present work nano-hydroxyapatite (n-HAp)/Carboxymethyl Cellulose (CMC) composite was synthesized. The n-HApCMC composite was tested for the adsorption of Chromium from aqueous solution and compared its removal capacity with nano-hydroxyapatite (n-HAp). Equilibrium data were fitted well in the Langmuir and Freundlich isotherm models. The thermodynamic analysis also established that the adsorption process was endothermic and spontaneous.
Journal of Materials Science: Materials in Electronics, 2020
In this work, a simple microwave method was utilized to prepare ZnO sheet linked with Fe3O4@rGO c... more In this work, a simple microwave method was utilized to prepare ZnO sheet linked with Fe3O4@rGO core–shell and of Ag2CO3 through formation of the quadri-photocatalytic with high activity. The microstructure, morphology, spectroscopic, and magnetic characteristics of the prepared samples were assessed using XRD, SEM, PL, TEM, FT-IR, DLS, and VSM analysis. The photocatalytic activity of the material was evaluated for photodegradation of methylene blue dye under the UV and visible light with home-made photoreactor. The response surface method in a Box–Behnken design was utilized to design the experiments. The parameters affecting the efficiency of the degradation including, pH (5–9), photocatalyst dose (50–150 mg), contact time (30–90 min), and radiation power (30–60 W) were studied and optimized. The optimum parameters were found to the initial concentration of 10 ppm, after a reaction time of 63.65 min, the amount of the catalyst of 150 mg, the pH of 8.99, and 94.99% of degradation (in the radiation power of 45 W).
The current inquiry aimed at using core-shell Fe3O4@Humic acid/montmorillonite nanocomposites for... more The current inquiry aimed at using core-shell Fe3O4@Humic acid/montmorillonite nanocomposites for removing methyl orange dye from an aqueous solution. The samples were characterized by FT-IR, TEM, SEM, XRD, BJH, and BET analytical methods. The efficiency removal has been utilized for 300 min reaction time using the response surface methodology by a design of five-factor-three-level central composite. The adsorption kinetics followed the pseudo-second-order rate kinetic model, showing an acceptable correlation (R2 > 0.99). Langmuir, Freundlich, Temkin, Dubinin–RadushKevich, and Harkins–Jura isotherms were utilized for the analysis of the equilibrium data. Also, we have estimated standard Gibbs free energy (∆G°), standard enthalpy (∆H°), standard entropy (∆S°), and the activation energy (Ea). The findings of this investigation suggest that the absorption of methyl orange on the adsorbent pursues the Frondelich isothermal formulation. The ∆G° values obtained showed physical absorpti...
... is probably a function of the low surface coverage of appropriately spaced Cr 3+ sites for bi... more ... is probably a function of the low surface coverage of appropriately spaced Cr 3+ sites for bidentate ... conducted over CrCl 3 to investigate the possibility of the chlorination reaction on this catalyst. The chromium(III) oxide (0.2 g) was loaded in the microreactor; it was heated under ...
In this paper, human hair, as a waste material, was utilized in order to prepare keratin nanopart... more In this paper, human hair, as a waste material, was utilized in order to prepare keratin nanoparticles. The characterization of keratin nanoparticles was performed applying Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-Ray diffraction (XRD). The average diameter of keratin nanoparticles was found to be 63.7 nm, using particle size analyzer. Subsequently, the keratin nanoparticles were employed for Cr (VI) ions adsorption. The batch experiment was carried out to find the optimum conditions; i.e. contact time, pH, adsorbent dose and initial concentration of Cr (VI) ions. The adsorption capacity was extremely pH-dependent, and the maximum adsorption of Cr (VI) happened in the acidic pH range. The results demonstrated that the maximum adsorption capacity, obtained in acidic pH, was 161.29 mg/g. The equilibrium data were well fitted by Freundlich isotherm. The kinetic studies were performed with the Lager...
This research is a comparative study of the surface chemistry and adsorptive characteristics of t... more This research is a comparative study of the surface chemistry and adsorptive characteristics of titanium dioxide nanoparticles on activated carbon (Ac/TiO2) and chitosan loaded on activated carbon (Ac/TiO2/Ch). For the first time, using three-fold composite of activated carbon prepared from Persian mesquite seeds, chitosan, and nanoparticles of titanium dioxide as an effective adsorbent for removing safranin o. X-ray Diffraction (XRD), scanning electron microscope (SEM), BET analysis, and thermogravimetric analysis (TGA) have been used to determine and confirm physicochemical variation during preparing and modifying activated carbon on both adsorbents. The results of XRD, SEM, and TGA are shown essential changes happened in porosity of the surface after the modification process. The Ac/TiO2 and Ac/TiO2/Ch adsorbents have been used to /remove safranin o as a cationic azo dye from an aqueous solution. The experimental data at different conditions were correlated by some famous kinetic...
ALKHAS;The Journal of Environment, Agriculture and Biological Sciences, 2020
In the present work nano-hydroxyapatite (n-HAp)/Carboxymethyl Cellulose (CMC) composite was synth... more In the present work nano-hydroxyapatite (n-HAp)/Carboxymethyl Cellulose (CMC) composite was synthesized. The n-HApCMC composite was tested for the adsorption of Chromium from aqueous solution and compared its removal capacity with nano-hydroxyapatite (n-HAp). Equilibrium data were fitted well in the Langmuir and Freundlich isotherm models. The thermodynamic analysis also established that the adsorption process was endothermic and spontaneous.
Journal of Materials Science: Materials in Electronics, 2020
In this work, a simple microwave method was utilized to prepare ZnO sheet linked with Fe3O4@rGO c... more In this work, a simple microwave method was utilized to prepare ZnO sheet linked with Fe3O4@rGO core–shell and of Ag2CO3 through formation of the quadri-photocatalytic with high activity. The microstructure, morphology, spectroscopic, and magnetic characteristics of the prepared samples were assessed using XRD, SEM, PL, TEM, FT-IR, DLS, and VSM analysis. The photocatalytic activity of the material was evaluated for photodegradation of methylene blue dye under the UV and visible light with home-made photoreactor. The response surface method in a Box–Behnken design was utilized to design the experiments. The parameters affecting the efficiency of the degradation including, pH (5–9), photocatalyst dose (50–150 mg), contact time (30–90 min), and radiation power (30–60 W) were studied and optimized. The optimum parameters were found to the initial concentration of 10 ppm, after a reaction time of 63.65 min, the amount of the catalyst of 150 mg, the pH of 8.99, and 94.99% of degradation (in the radiation power of 45 W).
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Papers by Abdolhadi Farrokhnia