Preparation method of rare-earth-doped modified nano titanium oxide photocatalyst capable of degrading methyl orange organic dye

Abstract

The invention discloses a preparation method of a rare-earth-doped modified nano titanium oxide photocatalyst capable of degrading methyl orange organic dye. In the preparation method of the rare-earth-doped modified nano titanium oxide photocatalyst capable of degrading methyl orange organic dye, a sol-gel method is used to introduce a rare earth ion into a TiO2 lattice so as to introduce new charges into the lattice, further form defects or change the lattice type, affect the movement state of photogenerated electron-hole pairs, adjust the distribution state of the photogenerated electron-hole pairs or change the energy band of TiO2, and finally lead to a change in the photocatalytic activity of TiO2. An obtained rare-earth-doped modified nano-TiO2 powder has uniform particles, has a crystal grain size in a range of 10 to 35 nm. The photocatalytic performance is obviously improved after doping, and the absorption spectrum is shifted to the visible light. Doping of the rare earth ioncan inhibit the transformation of a TiO2 anatase phase to a rutile phase and increase the phase transition temperature. Also, the growth of nanocrystals is inhibited, and effect of refining crystal grains is exerted.

Description

Technical field [0001] The invention relates to the technical field of a photocatalyst preparation process, in particular to a method for preparing a rare earth doped modified nano titanium oxide photocatalyst that can degrade methyl orange organic dyes. Background technique [0002] The treatment of environmental pollution has become a key research issue for scientists from all over the world. Water resource pollution is a prominent object in environmental pollution, and improving sewage treatment technology is a hot topic of extensive research in the field of environmental protection. The photocatalytic oxidation method has low energy consumption and can effectively convert organic pollutants into small molecules such as H2O, CO2, and inorganic ions, achieving the purpose of complete mineralization and avoiding secondary pollution. At present, most of this technology in China is limited to the laboratory research level, and the progress is slow. [0003] For a long time, the tr...

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Problems solved by technology

[0007] At present, there are still some problems restricting the development of photocatalytic technology, mainly reflected in: (1) the recombination rate of photogenerated carriers is high, and the catalytic activity of photocatalyst is low; (2) TiO 2 The forbidden band is wide, the spectral response range is narrow, and the solar energy utilization rate is low, accounting for only about 6.5% of the total solar radiation; (3) powder catalysts are prone to agglomeration in the water phase, and some loading technologies greatly reduce The activity of photocatalyst; (4) The mechanism of photocatalytic reaction is not yet mature

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