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Mohammad Hossein Habibi,Amir Hossein Habibi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
This paper presents the preparation, characterization, and application of four different nanocomposites in photocatalytic degradation of the Brilliant Red M5B as a dye contaminant. Nanocomposites include ZnFe2O4, porous ZnFe2O4, ZnFe2O4–TiO2, and FeTiO3 prepared and coated on a glass slide by doctor blade method. Different techniques to characterize composites are X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and diffuse reflectance spectra (DRS). FESEM shows that nanocomposites are nanocrystallines and a narrow dispersion in size. XRD confirms that the prepared nanocomposites are composed of ZnFe2O4, FeTiO3 and TiO2. Degradation efficiency of composites is evaluated using Brilliant Red M5B as a model pollutant under UV irradiation with homemade photocatalytic apparatus. The results showed that the photocatalytic efficiency of ZnFe2O4–TiO2 is higher than that of other photocatalyst, which is mainly ascribed to ZnFe2O4 NPs with the spinel structure.
Mohammad Hossein Habibi,Elham Askari 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
Zinc zirconate nanopowder (ZZN) photocatalyst was prepared by sol–gel method using zinc acetate and zirconium acetylacetonate as precursors. The optimal calcination temperature was 800 8C and ZnZrO3phase was formed. The structural and morphology properties of the nanocomposite were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDAX) and ultraviolet visible diffuse reflectance (UV-DRS). The SEM observation for ZZN showed the average grain size of 26 nm. UV–vis diffuse reflectance spectra (DRS) of the nanocomposite showed an absorption edge at 355 nm. The catalytic activity of ZZN was investigated by degradation of Tertrodirect Light Blue (TLB) dye in water using UV–vis spectroscopy (UV–vis) with an initial concentration of 20 mg/L dye. The influence of the catalyst concentration, time of irradiation and pH on photodegradation of dye was investigated. The results showed that degradation of TLB dye can be conducted in the photocatalytic process. Accordingly, a degradation of more than 97% of dye was achieved by applying the optimal operational parameters with 30 mg/L of catalyst, pH 9 at 1 h irradiation.
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.
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.
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.
Mohammad Hossein Habibi,Elahe Shojaee 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Nanostructure zinc oxide/cobalt oxide composite (NZCC) photocatalysts were grown on glass substrate by spin-coating technique using zinc acetate dihydrate and cobalt acetate tetrahydrate as starting precursors. The calcination of these precursors yielded composite NZCC. The structural, electrical, crystalline size and optical properties were investigated using X-ray diffraction, scanning electron microscopy and UV–vis diffuse reflectance spectroscopy. UV–vis diffuse reflectance spectroscopy shows a band gap of 1.68 eV for NZCC. SEM micrographs show the uniform distribution of spherical grains of about 52 nm grain size for the ZC thin films. NZCC films coated on glass were applied for the photodegradation of an azo textile dye KE-2B in water.
Mohammad Hossein Habibi,Amir Hossein Habibi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
An efficient and scalable one-pot synthetic method to prepare nanostructure composite of ZnFe2O4–FeFe2O4–ZnO (ZFZ) has been investigated. This method is based on thermal decomposition of iron(III)acetate and zinc acetate in monoethanolamine (MEA) as a capping agent. Moreover, thermogravimetricanalysis (TG-DTG) was performed to determine the temperature at which the decomposition andoxidation of the chelating agents took place. ZFZ was immobilized on glass using doctor blade methodand calcinated at different temperatures. The properties of the ZFZ nanocomposite have been examinedby different techniques, such as X-ray diffraction (XRD), field emission scanning electron microscopy(FESEM) and diffuse reflectance (DRS). FESEM shows that nanocomposite is monocrystallines and anarrow dispersion in size of 48 nm. XRD confirms that the prepared nanocomposite is composed offranklinite, ZnFe2O4 (54%), magnetite, FeFe2O4 (8%) and wurtzite, ZnO (48%). Photocatalytic activity ofZFZ immobilized on glass was carried out by choosing an azo textile dye, Reactive Red 195 (F3B) as amodel pollutant under UV irradiation with homemade photocatalytic apparatus and the resultsindicated that ZFZ exhibited good photocatalytic activity.
Mohammad Hossein Habibi,Reza Sheibani 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Silver-doped zinc oxide (SDZO) films have been grown on glass substrate by a novel combination of sol–gel and photochemical deposition processes (SGPD). The effect of sintering on structural, electrical and optical properties was investigated. The films were characterized by UV–vis absorption spectroscopy (UV–vis), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The result of X-ray photoelectron spectroscopy (XPS) revealed that the binding energy of Ag 3d5/2 for SDZO shifts remarkably to the lower binding energy compared to the pure metallic Ag due to the interaction between silver and zinc oxide. The XRD spectra of the SDZO films indicate that silver was incorporated in the hexagonal crystal structure of zinc oxide. SEM micrographs show the uniform distribution of spherical grains of about 73 nm grain size for the pure zinc oxide thin films. The results indicated that silver doping photochemical deposition was a feasible method to tune the optical properties of zinc oxide nanostructures. SDZO films coated on glass were applied for the photodegradation of mercaptan in water. SDZO films were applied for degradation of mercaptobenzoxazole which reduced the mercaptan concentration to more than 98%.
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.