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RISS 인기검색어
- 검색키워드
- 저자 : Bahareh Karimi (검색결과 5 건)
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Bahareh Karimi,Mohammad Hossein Habibi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Monodispersed Fe2TiO5 nanoheterostructure was prepared via simple surfactant-assisted sol–gelmethod using cetyltrimethylammonium bromide (CTAB). After quantitative and qualitative analysis ofnanostructures, simulated light-driven performance of Fe2TiO5 thinfilm as heterogeneous photocatalysttoward photodegradation of antibiotic metronidazole was investigated and compared with its formingmetal oxides. Results showed the highest photocatalytic activity for Fe2TiO5 after 2 h of irradiation bywhich the pseudofirst-order photodegradation reaction of metronidazole leads to water and carbondioxide production. Increase the photocatalysis efficiency based on Fe2TiO5 photocatalyst relative to TiO2and Fe2O3 is due to lower mean size, more uniform distribution of nanoparticles and consequently anincrease in the surface area available for the photocatalytic reaction, also the two metal centersarrangement in one structure that were resulted in effective light harvesting and enhancing theprobability of reduction–oxidation reactions owing to fast transferring of charge carriers to surface withpromoting separation and limiting recombination.
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Neda Habibi,Bahareh Karimi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Mixed zinc oxide nanoparticle coated magnetic iron oxide has been prepared by a sol–gel and coprecipitation routes. Magnetic iron oxide nanoparticles were synthesized by co-precipitation of ferric and ferrous ions with ammonia, and then zinc oxide was coated onto the surface of magnetic iron oxide by hydrolysis of zinc precursors. As a result, zinc oxide coated magnetic iron oxide nanoparticles with an average size of 68 nm were obtained. The crystalline bacterial cell surface layer)S-layer (used in this study was isolated from Lactobacillus helveticus ATCC 12046. The S-layer was adsorbed onto the surface of zinc oxide nanoparticle coated magnetic iron oxide. The nanoparticles were analyzed by X-ray powder diffractometry (XRD), infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM) were used to characterize the structural and the chemical features of the nanocomposites. The infrared spectra indicate that the S-layer-nanoparticle interaction occurs. This novel nanoparticle showed admirable potential in adsorption of S-layers on the surface of oxides for drug delivery.
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Mohammad Hossein Habibi,Bahareh Karimi,Mahmoud Zendehdel,Mehdi Habibi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Mixed copper-zinc oxide nanostructures (average size 43 nm) were effectively fabricated via coprecipitation route. Field-emission scanning electron microscope (FESEM), powder X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FT-IR) and UV–vis diffuse reflectance spectrum (DRS) were used to characterize the properties of the oxides. At the optimized condition, copper-zinc oxide nanostructures were used for fabrication of working electrodes by doctor blade technique on the fluorine-doped tin oxide (FTO) in dye sensitized solar cells. Their photovoltaic behavior were compared with standard using D35 dye and an electrolyte containing [Co(bpy)3](PF6)2, [Co(pby)3](PF6)3, LiClO4, and 4-tert-butylpyridine (TBP). The ranges of short-circuit current (Jsc) from 0.13 to 0.30 (mA/cm2), open-circuit voltage (Voc) from 0.20 to 0.51 V, and fill factor from 0.34 to 0.29 were obtained for the DSSCs made using the working electrodes. A titania blocking layer on the copper-zinc oxide surface improve both the open-circuit voltage (Voc), short-circuit current (Jsc) and the power-conversion efficiency is consequently enhanced by a factor of approximately five.
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Mohammad Hossein Habibi,Bahareh Karimi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Nanostructure CuO/ZnO mixed oxide was systematically prepared via the sol–gel route using zinc andcopper carbonates as precursors (molar ratio of 2:1) under thermal decomposition. The zinc and coppercarbonates precursors have been synthesized by a simple chemical reaction in high yield andcharacterized by its melting point, FT-IR and thermal analysis (TG/DTG). The TG/DTG analysis provedthat the thermal decomposition of zinc and copper carbonates precursors at 255 ℃ and 289 ℃ respectively. Thermo-gravimetric analysis (TG-DTG), X-ray diffraction (XRD), field emission scanningelectron microscopy (FESEM) and diffuse reflectance spectroscopy (DRS) studies were undertaken toinvestigate the thermal properties and electronic structure of the CuO/ZnO mixed oxide catalysts. XRDdata of the samples proved the formation of the nano-crystalline CuO/ZnO mixed oxide. Scanningelectron microscopy (SEM) showed that the spherical-like particles have a diameter in the range 35–45 nm. Optical spectra of the nanostructure show a band peaked at 1.35 eV which is associated to nearband gap transitions of CuO and a band centered at about 3.00 eV related to band gap transitions of ZnOnanostructures.
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Mohammad Hossein Habibi,Bahareh Karimi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Nanostructured CuO/ZnO composite oxide was prepared by a novel impregnation combustion method using copper nitrate and zinc oxide tetrapod. The X-ray diffraction patterns revealed that CuO/ZnO composite oxide was formed. The effects of different impregnation combustion parameters on the properties of composite were studied by field-emission scanning electron microscope (FESEM), powder X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and UV–vis diffuse reflectance spectrum (DRS). The synthesis of ZnO–CuO nanocomposites through impregnation of a zinc oxide tetrapod with copper nitrate aqueous sodium carbonate solutions is reported. During thermal treatment the samples evolve toward the formation of nanocrystalline ZnO particles (zincite phase) dispersed onto tenorite, CuO annealed at 450 ℃. XRD patterns of the precursors calcined at 450 ℃ showed the formation of the zincite–tenorite phases. Field emission scanning electron microscopy (FESEM) exhibited loosely agglomerated hexagonal particles with uniform morphology having a size around 50 nm.
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