Journal of Materials Science: Materials in Electronics, Feb 9, 2022
This paper aims to synthesis and characterization of SrFeO 3 /TiO 2 nanocomposite with enhanced v... more This paper aims to synthesis and characterization of SrFeO 3 /TiO 2 nanocomposite with enhanced visible-light activity. At first, SrFeO 3 nanoparticles were successfully synthesized by the thermal treatment method, and then Titania nanoparticles were prepared by hydrolysis precipitation process. Composite nanoparticles were synthesized at different ratios of Titania to Ferrite. To characterize the nanocomposites’ structure, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Brunauer Emmett Teller were applied. Furthermore. The UV–Vis diffuse reflectance spectra showed the red shift in the absorption spectra of the nanocomposites were significantly related to the ratio of Titania to Ferrite. Moreover, the photocatalytic activity of the nanocomposites was assessed under visible-light, considering Congo red dye degradation. By the ratio of the component of 1:0.5, the photocatalytic degradation efficiency reached 82% after 30 min of irradiation. PL spectroscopy was applied as a practical technique to examine the separation efficiency of the photogenerated carrier pairs in TiO 2 , SrFeO 3 , SrFeO 3 /TiO 2 (1:0.5). The accordance between PL and photocatalytic results, showed vital role of the constructed heterojunction in the nanocomposites to prevent the charge carrier recombination. Also, the synthesized SrFeO 3 /TiO 2 (1:0.5) nanocomposite showed a suitable reusability in the model pollutant treatment.
This paper aims to synthesize and describe BiFeO3/TiO2 nanocomposite with enhanced visible-light ... more This paper aims to synthesize and describe BiFeO3/TiO2 nanocomposite with enhanced visible-light activity. At first, BiFeO3 nanoparticles were successfully synthesized by the thermal treatment method, and then titania nanoparticles were prepared by hydrolysis precipitation process. Composite nanoparticles were synthesized at different ratios of ferrite to titania. To characterize the nanocomposites’ structure, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Brunauer–Emmett–Teller analysis were applied. The UV–visible diffuse reflectance spectra showed that redshift in the absorption spectra of the nanocomposites was significantly related to the ratio of ferrite to titania. Moreover, the photocatalytic activity of the nanocomposites was researched under visible light, discussing Congo red dye degradation. The best result was obtained by the BiFeO3/TiO2 (1:1), which the photocatalytic degradation efficiency reached 60% after 30 min of irradiation. PL spectroscopy was applied as a practical technique to examine the separation efficiency of the photogenerated carrier pairs. The accordance between PL and photocatalytic results showed vital role of the constructed heterojunction in the nanocomposites to prevent the charge carrier recombination. Also, the synthesized BiFeO3/TiO2 (1:1) nanocomposite showed a suitable reusability in the model pollutant treatment.
Journal of Photochemistry and Photobiology A-chemistry, Dec 1, 2019
Abstract Through a thermal treatment method, LiFe5O8 nanoparticles are prepared and by using situ... more Abstract Through a thermal treatment method, LiFe5O8 nanoparticles are prepared and by using situ polymerization method, reduced graphene oxide/lithium ferrite (RGO/LiFe5O8) nanocomposites with the ratios of 0.15, 0.20 and 0.25 are created. The structural and physical properties of prepared samples are analyzed by different techniques. By using degradation of methylene blue (MB), photocatalytic activity is investigated under visible light. The combination of LiFe5O8 nanoparticles with RGO causes the enhancement of photocatalytic activity in same conditions. Moreover, after five recycles, photocatalytic activity of RGO/LiFe5O8 does not change as compared to the photocatalytic activity of fresh catalyst, indicating the stability and reusability of RGO/LiFe5O8. Additionally, the antibacterial characteristics of studied samples were investigated against Staphylococcus aureus (S. aureus) as Gram- positive bacteria and Escherichia coli (E. coli) as a Gram- negative bacteria with inhibition zone and colony counting methods. According to obtained results, the pure LiFe5O8 do not have any antibacterial effect on S. aureus, and E. coli. RGO/LiFe5O8 nanocomposites with the maximum concentration of RGO have a greater antibacterial effect on S. aureus, and E. coli than LiFe5O8 nanoparticles and RGO/LiFe5O8 nanocomposites with lower RGO ratios.
Journal of Magnetism and Magnetic Materials, Jul 1, 2011
... Acknowledgment The authors would like to thank Miss. Fatemeh Moazami Goodarzi for her great a... more ... Acknowledgment The authors would like to thank Miss. Fatemeh Moazami Goodarzi for her great assistance in the chemical mechanism study. ... [8] J. Amighian, M. Mozaffari, B. Nasr, Preparation of nano-sized manganese ferrite (MnFe2O4) via coprecipitation method, Phys. ...
ABSTRACT Cobalt ferrite nanocrystals were prepared from an aqueous solution containing metal nitr... more ABSTRACT Cobalt ferrite nanocrystals were prepared from an aqueous solution containing metal nitrates and various of concentrations of poly(vinyl pyrrolidone), followed by calcinations temperature. X-ray diffraction (XRD) analysis was performed to determine the degree of crystallinity of the ferrite nanoparticles. By transmission electron microscopy (TEM), the morphology and average particle size of the cobalt ferrite nanoparticles were evaluated which had good agreement with XRD results. Fourier transform infrared spectroscopy (FT-IR) suggested the presence of metal oxide bands in all samples as well as the effective elimination of organic constituents after calcinations. Vibrating sample magnetometer (VSM), was utilized to evaluate the magnetic properties of the cobalt ferrite nanoparticles.
LaFeO3 nanoparticles were synthesized by different chemical procedures, i.e., microwave-thermal t... more LaFeO3 nanoparticles were synthesized by different chemical procedures, i.e., microwave-thermal treatment method (MTTM), hydrothermal method (HTM) and sol–gel method (SGM), by using metal nitrates as La- and Fe-precursors. The synthesized nanoparticles were calcined at various temperature from 450°C to 1000°C. SEM analysis of samples synthesized by MTTM and SGM highlighted the formation of uniform spherical-like nanoparticles while those obtained by HTM were a combination of spherical particles and nanorods. X-ray diffraction patterns of nanocrystals confirmed that these nanoparticles are formed by crystalline LaFeO3 in the orthorhombic structure. The synthesized LaFeO3 were further investigated for analyzing their optical, magnetic and gas sensing behaviors. Band gap values for LaFeO3 by MTTM and HTM were in the range 2.07–2.41 eV and 1.57–1.94 eV, respectively, for the samples annealed at growing temperature, whereas vibrating sample magnetometer analysis demonstrated their weak ferromagnetic behavior. LaFeO3 synthesized by SGM showed interesting sensing properties for monitoring O2 and ethanol in ambient air.
... 2767-2772. [11] RK Selvan, CO Augustin, LJ Berchmans, and R. Saraswathi, “Combustion synthesi... more ... 2767-2772. [11] RK Selvan, CO Augustin, LJ Berchmans, and R. Saraswathi, “Combustion synthesis of CuFe2O4,” Mater. ... [19] MK shobana,V. Rajendran, K. Jeyasubramanian, and NS Kumar, “Preparation and characterisation of NiCo ferrite nanoparticles,” Mater. Lettvol, vol. ...
Journal of Materials Science: Materials in Electronics, Feb 9, 2022
This paper aims to synthesis and characterization of SrFeO 3 /TiO 2 nanocomposite with enhanced v... more This paper aims to synthesis and characterization of SrFeO 3 /TiO 2 nanocomposite with enhanced visible-light activity. At first, SrFeO 3 nanoparticles were successfully synthesized by the thermal treatment method, and then Titania nanoparticles were prepared by hydrolysis precipitation process. Composite nanoparticles were synthesized at different ratios of Titania to Ferrite. To characterize the nanocomposites’ structure, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Brunauer Emmett Teller were applied. Furthermore. The UV–Vis diffuse reflectance spectra showed the red shift in the absorption spectra of the nanocomposites were significantly related to the ratio of Titania to Ferrite. Moreover, the photocatalytic activity of the nanocomposites was assessed under visible-light, considering Congo red dye degradation. By the ratio of the component of 1:0.5, the photocatalytic degradation efficiency reached 82% after 30 min of irradiation. PL spectroscopy was applied as a practical technique to examine the separation efficiency of the photogenerated carrier pairs in TiO 2 , SrFeO 3 , SrFeO 3 /TiO 2 (1:0.5). The accordance between PL and photocatalytic results, showed vital role of the constructed heterojunction in the nanocomposites to prevent the charge carrier recombination. Also, the synthesized SrFeO 3 /TiO 2 (1:0.5) nanocomposite showed a suitable reusability in the model pollutant treatment.
This paper aims to synthesize and describe BiFeO3/TiO2 nanocomposite with enhanced visible-light ... more This paper aims to synthesize and describe BiFeO3/TiO2 nanocomposite with enhanced visible-light activity. At first, BiFeO3 nanoparticles were successfully synthesized by the thermal treatment method, and then titania nanoparticles were prepared by hydrolysis precipitation process. Composite nanoparticles were synthesized at different ratios of ferrite to titania. To characterize the nanocomposites’ structure, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Brunauer–Emmett–Teller analysis were applied. The UV–visible diffuse reflectance spectra showed that redshift in the absorption spectra of the nanocomposites was significantly related to the ratio of ferrite to titania. Moreover, the photocatalytic activity of the nanocomposites was researched under visible light, discussing Congo red dye degradation. The best result was obtained by the BiFeO3/TiO2 (1:1), which the photocatalytic degradation efficiency reached 60% after 30 min of irradiation. PL spectroscopy was applied as a practical technique to examine the separation efficiency of the photogenerated carrier pairs. The accordance between PL and photocatalytic results showed vital role of the constructed heterojunction in the nanocomposites to prevent the charge carrier recombination. Also, the synthesized BiFeO3/TiO2 (1:1) nanocomposite showed a suitable reusability in the model pollutant treatment.
Journal of Photochemistry and Photobiology A-chemistry, Dec 1, 2019
Abstract Through a thermal treatment method, LiFe5O8 nanoparticles are prepared and by using situ... more Abstract Through a thermal treatment method, LiFe5O8 nanoparticles are prepared and by using situ polymerization method, reduced graphene oxide/lithium ferrite (RGO/LiFe5O8) nanocomposites with the ratios of 0.15, 0.20 and 0.25 are created. The structural and physical properties of prepared samples are analyzed by different techniques. By using degradation of methylene blue (MB), photocatalytic activity is investigated under visible light. The combination of LiFe5O8 nanoparticles with RGO causes the enhancement of photocatalytic activity in same conditions. Moreover, after five recycles, photocatalytic activity of RGO/LiFe5O8 does not change as compared to the photocatalytic activity of fresh catalyst, indicating the stability and reusability of RGO/LiFe5O8. Additionally, the antibacterial characteristics of studied samples were investigated against Staphylococcus aureus (S. aureus) as Gram- positive bacteria and Escherichia coli (E. coli) as a Gram- negative bacteria with inhibition zone and colony counting methods. According to obtained results, the pure LiFe5O8 do not have any antibacterial effect on S. aureus, and E. coli. RGO/LiFe5O8 nanocomposites with the maximum concentration of RGO have a greater antibacterial effect on S. aureus, and E. coli than LiFe5O8 nanoparticles and RGO/LiFe5O8 nanocomposites with lower RGO ratios.
Journal of Magnetism and Magnetic Materials, Jul 1, 2011
... Acknowledgment The authors would like to thank Miss. Fatemeh Moazami Goodarzi for her great a... more ... Acknowledgment The authors would like to thank Miss. Fatemeh Moazami Goodarzi for her great assistance in the chemical mechanism study. ... [8] J. Amighian, M. Mozaffari, B. Nasr, Preparation of nano-sized manganese ferrite (MnFe2O4) via coprecipitation method, Phys. ...
ABSTRACT Cobalt ferrite nanocrystals were prepared from an aqueous solution containing metal nitr... more ABSTRACT Cobalt ferrite nanocrystals were prepared from an aqueous solution containing metal nitrates and various of concentrations of poly(vinyl pyrrolidone), followed by calcinations temperature. X-ray diffraction (XRD) analysis was performed to determine the degree of crystallinity of the ferrite nanoparticles. By transmission electron microscopy (TEM), the morphology and average particle size of the cobalt ferrite nanoparticles were evaluated which had good agreement with XRD results. Fourier transform infrared spectroscopy (FT-IR) suggested the presence of metal oxide bands in all samples as well as the effective elimination of organic constituents after calcinations. Vibrating sample magnetometer (VSM), was utilized to evaluate the magnetic properties of the cobalt ferrite nanoparticles.
LaFeO3 nanoparticles were synthesized by different chemical procedures, i.e., microwave-thermal t... more LaFeO3 nanoparticles were synthesized by different chemical procedures, i.e., microwave-thermal treatment method (MTTM), hydrothermal method (HTM) and sol–gel method (SGM), by using metal nitrates as La- and Fe-precursors. The synthesized nanoparticles were calcined at various temperature from 450°C to 1000°C. SEM analysis of samples synthesized by MTTM and SGM highlighted the formation of uniform spherical-like nanoparticles while those obtained by HTM were a combination of spherical particles and nanorods. X-ray diffraction patterns of nanocrystals confirmed that these nanoparticles are formed by crystalline LaFeO3 in the orthorhombic structure. The synthesized LaFeO3 were further investigated for analyzing their optical, magnetic and gas sensing behaviors. Band gap values for LaFeO3 by MTTM and HTM were in the range 2.07–2.41 eV and 1.57–1.94 eV, respectively, for the samples annealed at growing temperature, whereas vibrating sample magnetometer analysis demonstrated their weak ferromagnetic behavior. LaFeO3 synthesized by SGM showed interesting sensing properties for monitoring O2 and ethanol in ambient air.
... 2767-2772. [11] RK Selvan, CO Augustin, LJ Berchmans, and R. Saraswathi, “Combustion synthesi... more ... 2767-2772. [11] RK Selvan, CO Augustin, LJ Berchmans, and R. Saraswathi, “Combustion synthesis of CuFe2O4,” Mater. ... [19] MK shobana,V. Rajendran, K. Jeyasubramanian, and NS Kumar, “Preparation and characterisation of NiCo ferrite nanoparticles,” Mater. Lettvol, vol. ...
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