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The photocatalytic

Xem 1-20 trên 71 kết quả The photocatalytic
  • The materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and Ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic activity of CN-500/TaO-W samples was assessed by degradation of methylene blue in aqueous solution under visible light. Among them, CN-500/TaO-4 exhibited the best performance. An enhancement in photocatalytic activity of the composites is believed to be the presence of g-C3N4.

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  • The fluorination of perlite granules and the immobilization of ZnO nanoparticles on the perlite surface were carried out at the same time by a simple impregnation method to create new highly photocatalytic materials which are easily separated from reaction solutions after treatment. The influence of perlite fluorination on the crystal structure, morphology, UVvisible absorption, and surface functional groups of ZnO, as well as on the ZnO content on perlite, was respectively characterized by XRD, FE-SEM, UV-Visible diffuse reflectance, FTIR and atomic absorption spectrometry.

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  • The TiO2 nanotubes were fabricated by the hydrothermal method. Then, Ag nanoparticles with the varying ratio were attached on the TiO2 nanotubes by photoreduction. The characteristics of structure, morphology, chemical composition and of TiO2 nanotubes modified Ag (Ag-TNTs) was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and the absorption spectral of Methylene blue (MB) solution. The results showed that Ag-TNTs have fairly uniform length with Ag particles immobilized on the tube.

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  • The photocatalytic decoloration of an organic dye, ethyl violet (EV), has been studied in the presence of TiO2 and the addition of b-Cyclodextrin (b-CD) with TiO2 (TiO2-b-CD) under UV-A light irradiation. The different operating parameters like initial concentration of dye, illumination time, pH and amount of catalyst used have also been investigated. The photocatalytic decoloration efficiency is more in the TiO2-b-CD/UV-A light system than TiO2/UV-A light system. The mineralization of EV has been confirmed by Chemical Oxygen Demand (COD) measurements.

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  • The SnO2/TiO2 nanoparticles have been successfully synthesized via the surfactant-assisted sol-gel method. The results showed that the anatase to rutile phase transformation and the crystallite size increased with increasing the calcination temperature.

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  • Objective of the thesis: Successfully fabricate Cu2O thin film having good crystal structure. Fabricate layers protecting Cu2O electrode from photocorrosion. Study the photocatalytic, electro-photocatalytic water splitting properties of the Cu2O electrode.

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  • The photocatalytic ability of CuO-TNTs was determined by absorbance spectroscopy of methylene blue (MB) solution under various irradiation conditions. Results showed that the photocatalytic activity of CuO-TNTs is lower than that of the original TNTs in UV irradiation. In contrast, it shows the better performance in visible light and sunlight than that of the TNTs.

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  • Flower-like Bi2WO6 were successfully synthesized using the solvothermal method at different temperatures and characterized by XRD, FE-SEM, and DRS. We also investigated the photocatalytic activity of Bi2WO6 for the decomposition of rhodamine B under visible light irradiation. From XRD and SEM results, the reaction temperature has significant effects on the morphologies of the samples. From DRS results, Bi2WO6 samples displayed the absorption spectrum up to the visible region and then they showed the high photocatalytic activity under visible light irradiation, as a comparison with TiO2-P25.

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  • With the aim to enhance photocatalytic properties and anti-Ecoli bacteria abilities of TiO2 thin films; hierarchical heterogeneous nanostructured ZnO/TiO2 (HNs) films were deposited by DC magnetron sputtering. The obtained results showed that both the photocatalytic performance and anti - Ecoli bacteria ability of HNs films exhibited enhancement in comparison with standard TiO2 films. This enhancement was explained due to the reduction of the electron - hole recombination and the red shift of absorption edge of the HNs films.

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  • In this study, we report for the first time on the photocatalytic decolorization of Procion 032 Carmine Red (PC032) using titania nanotubes (TNTs). Photocatalysts of TNTs were synthesized by hydrothermal method under strong alkali condition using powder TiO2 as a precursor and calcined at different temperatures (100 - 700oC).

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  • The synthesis of graphene (Gr) - gold (Au) nanoparticle (NP) composite was achieved using continuous ultraviolet wave exposure. The functional groups were investigated with FTIR spectra. From the Raman spectra, D-band and G-band of Gr were identified. As a result, the uniform deposition of nanometer-sized Au NPs on the Gr sheets was observed from the field emission scanning electron microscope (FE-SEM) images. The photodegradation of methylene blue in aqueous solutions was studied using various photocatalysts, including neat TiO2, Gr/TiO2 and Gr-Au/TiO2 composites.

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  • A novel technique based on photocatalysis was applied to eliminate chromium ions, a toxic hazardous environmental pollutant. The photoreduction of each species of chromium (total, hexavalent, and trivalent chromiums) from chrome-electroplating wastewater was investigated using a titanium dioxide suspension under irradiation by a low-pressure mercury lamp. The initial concentration of total chromium was 300 mg/l. The applied conditions were the direct photocatalytic reduction process at pH 3.65 and the indirect photocatalytic reduction with added hole scavengers at the same solution pH.

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  • In this study, homogeneous titanate tubular (TNT) and diatom/TNT composites (D/TNT) were prepared by a facile hydrothermal method. The crystalline structure and morphology of the synthesised samples were studied by X-ray diffractometry (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM). Furthermore, the photocatalytic activity for degradation of methylene blue (MB) was investigated under sunlight irradiation. The results showed that the MB degradation by D/TNT was higher than bare TNT.

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  • TiO2 thin film with nanoporous structure are prepared from colloidal suspension containing polyethylen glycol (PEG) via Sol-Gel method. The effect of PEG addition to the precursor solution on the surface structures and photocatalytic activity of the resultant thin films are studied. The larger the amount of PEG added to to the precursor solution, the larger the size and number of pores produced in the resultant films when PEG added to the gel films decomposed completely during heat-treatment.

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  • TiO2-Fe@CNTs nanocomposite materials were synthesized by hydrothermal route in Teflon-sealed autoclave at 180˚C for 10h. The FESEM and X-Ray diffraction measurements were taken for morphology and structural analysis of TiO2 nanoparticles doped with Fe coating on CNTs. The effects of the iron and CNTs on the enhanced photocatalytic activity for methylene blue degradation under AM 1.5 illumination of 100 mW.cm−2were investigated.

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  • The objectives of the thesis: Study on materials fabrication technology; structural - photocatalytic properties of TiO2 material, and TiO2 as the nanostructured variant. On the basis of such material system, the systematic and quantitative study on hydrophilicity or, in other words, the study of surface energy of material systems under Exciation of UV light radiation. Further clarification of the correlation between photocatalytic activity, self-cleaning and hydrophobicity of TiO2 nanostructured materials.

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  • The as-prepared Fe-BTC/GO nanocomposite was tested the photocatalytic degradation of reactive dye (reactive red-RR195) in aqueous solution. The Fe-BTC/GO composite exhibited excellent photocatalytic activity. The research suggested a potential application of Fe-BTC/GO composite as a highly efficient photocatalytic degradation of reactive dye in aqueous solution.

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  • TiO2-Graphene Oxide-Hemin (TiO2/GO/Hemin) ternary composite hybrid material was prepared by the sol-gel method and used as a heterogeneous catalyst for the photocatalytic degradation of organic contaminants. The catalytic activity of GO-TiO2-Hemin was evaluated by the degradation of Rhodamine B (RhB) under the UV-visible light irradiation and in the presence of hydrogen peroxide.

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