Magnetically Recoverable TiO2/SiO2/γ-Fe2O3/rGO Composite with Significantly Enhanced UV-Visible Light Photocatalytic Activity. 2020

Reyhaneh Kaveh, and Maryam Mokhtarifar, and Mojtaba Bagherzadeh, and Andrea Lucotti, and Maria Vittoria Diamanti, and MariaPia Pedeferri
Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, 20124 Milano, Italy.

In this paper, we report the preparation of a new composite (TiO2/SiO2/γ-Fe2O3/rGO) with a high photocatalytic efficiency. The properties of the composite were examined by different analyses, including X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), photoluminescence (PL), UV-Visible light diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy (FTIR), Raman, vibrating-sample magnetometer (VSM), and nitrogen gas physisorption (BET) studies. The photocatalytic efficiency of the proposed composite was evaluated by the degradation of methylene blue under UV and visible light, and the results were compared with titanium dioxide (TiO2), where degradation increased from 30% to 84% and 4% to 66% under UV and visible light, respectively. The significant increase in photocatalytic activity may be explained by the higher adsorption of dye on the surface of the composite and the higher separation and transfer of charge carriers, which in turn promote active sites and photocatalytic efficiency.

UI MeSH Term Description Entries
D008027 Light That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range. Light, Visible,Photoradiation,Radiation, Visible,Visible Radiation,Photoradiations,Radiations, Visible,Visible Light,Visible Radiations
D008280 Magnetics The study of MAGNETIC PHENOMENA. Magnetic
D010777 Photochemistry A branch of physical chemistry which studies chemical reactions, isomerization and physical behavior that may occur under the influence of visible and/or ultraviolet light. Photochemistries
D002384 Catalysis The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction. Catalyses
D005290 Ferric Compounds Inorganic or organic compounds containing trivalent iron. Compounds, Ferric
D006108 Graphite An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation. Graphene
D012822 Silicon Dioxide Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid. Silica,Aerosil,Aerosil 380,Cristobalite,Quso G-32,Quso G32,Tridymite,380, Aerosil,Dioxide, Silicon,G32, Quso,Quso G 32
D014025 Titanium A dark-gray, metallic element of widespread distribution but occurring in small amounts with atomic number, 22, atomic weight, 47.867 and symbol, Ti; specific gravity, 4.5; used for fixation of fractures.
D014466 Ultraviolet Rays That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants. Actinic Rays,Black Light, Ultraviolet,UV Light,UV Radiation,Ultra-Violet Rays,Ultraviolet Light,Ultraviolet Radiation,Actinic Ray,Light, UV,Light, Ultraviolet,Radiation, UV,Radiation, Ultraviolet,Ray, Actinic,Ray, Ultra-Violet,Ray, Ultraviolet,Ultra Violet Rays,Ultra-Violet Ray,Ultraviolet Black Light,Ultraviolet Black Lights,Ultraviolet Radiations,Ultraviolet Ray
D056951 Photoelectron Spectroscopy The study of the energy of electrons ejected from matter by the photoelectric effect, i.e., as a direct result of absorption of energy from electromagnetic radiation. As the energies of the electrons are characteristic of a specific element, the measurement of the energy of these electrons is a technique used to determine the chemical composition of surfaces. Photoelectron Spectrometry,Electron Spectroscopy for Chemical Analysis,Photoelectron Emission Spectroscopy,Photoemission Spectroscopy,Ultra-Violet Photoelectron Spectroscopy,Ultraviolet Photoelectron Spectroscopy,X-Ray Photoelectron Spectroscopy,Xray Photoelectron Spectroscopy,Emission Spectroscopies, Photoelectron,Emission Spectroscopy, Photoelectron,Photoelectron Spectroscopy, Ultra-Violet,Photoelectron Spectroscopy, Ultraviolet,Photoelectron Spectroscopy, X-Ray,Photoelectron Spectroscopy, Xray,Spectrometry, Photoelectron,Spectroscopy, Photoelectron,Spectroscopy, Photoelectron Emission,Spectroscopy, Photoemission,Spectroscopy, Ultra-Violet Photoelectron,Spectroscopy, Ultraviolet Photoelectron,Spectroscopy, X-Ray Photoelectron,Spectroscopy, Xray Photoelectron,Ultra Violet Photoelectron Spectroscopy,X Ray Photoelectron Spectroscopy

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