Preparation method of photochemical catalyst activated carbon doped titanium dioxide nano material

A photocatalytic activity, nanomaterial technology, applied in the field of inorganic nanophotocatalytic materials, can solve the problems of complex process, increase product production cost, unfavorable large-scale preparation, etc., to simplify production process, reduce production cost, and improve light quantum efficiency. Effect

Inactive Publication Date: 2009-03-18
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Most of the methods for preparing carbon-doped titanium dioxide reported in these literatures involve complex processes, or high-temperature calcination under nitrogen or vacuum conditions, which is not conducive to large-scale preparation, or requires the addition of special chemical substances, which increases the production cost of the product

Method used

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  • Preparation method of photochemical catalyst activated carbon doped titanium dioxide nano material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 10ml of tetrabutyl titanate and add it dropwise into 10ml of water, then fully stir and mix for 30min to obtain a white precipitate. The above white precipitated substance was dried at 60° C. for 12 hours, and then ground to obtain a solid powder. The solid powder was heat-treated in an oxygen-deficient device, and calcined in an air atmosphere at 400° C. for 1 hour to obtain a gray-black powder. After the product is collected, it is washed with water and alcohol for 5 times by centrifugation, and then air-dried at 60° C. to obtain carbon-doped titanium dioxide nanopowder with stable performance. The ultraviolet-visible diffuse reflectance absorption spectrum of the prepared carbon-doped titanium dioxide nanopowder is as follows: figure 1shown. The performance test results of degrading methyl orange showed that the decolorization rate of methyl orange reached 92% under visible light for 120 minutes.

Embodiment 2

[0026] Take 10ml of tetraisopropyl titanate and add it dropwise into 20ml of water, then stir and mix thoroughly for 30min to obtain a white precipitate. The above white precipitated substance was dried at 80° C. for 24 hours, followed by grinding to obtain a solid powder. The solid powder was heat-treated in an oxygen deficient apparatus, and calcined in an air atmosphere at 300° C. for 1 hour to obtain an off-white powder. After the product is collected, it is washed with water and alcohol three times by centrifugation, and then air-dried at 60°C to obtain carbon-doped titanium dioxide nanopowder with stable performance. The performance test results of degrading methyl orange showed that the decolorization rate of methyl orange reached 86% under visible light for 120 minutes.

Embodiment 3

[0028] Take 10ml of tetrabutyl titanate and add it dropwise to 5ml of water, then stir and mix thoroughly for 30min to obtain a white precipitate. The above white precipitated substance was dried at 80° C. for 12 hours, followed by grinding to obtain a solid powder. The solid powder was heat-treated in an oxygen-deficient device, and calcined in an air atmosphere at 450° C. for 1 hour to obtain a white powder. After the product was collected, it was washed with water and alcohol three times by centrifugation, and then air-dried at 60° C. to obtain carbon-doped titanium dioxide nanopowder. The performance test results of degrading methyl orange showed that the decolorization rate of methyl orange reached 79% under visible light for 120 minutes.

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Abstract

The invention relates to a preparation method for photocatalytic active carbon mixed by TiO2 nanometer material; partly hydrolyzed precursor of organic titanium is roasted under the atmosphere lack of oxygen so as to lead the carbon element to enter the crystal lattice of TiO2 to form carbon-mixed TiO2. Firstly, organic compound of titanium is added in water according to a certain proportion to form white deposition material; subsequently, the white deposition material is dried at the temperature of 50-200 DEG C, is ground to gain solid powder, is heated under the atmosphere lack of oxygen, and is roasted for 0.2-6 hours under the atmosphere with the temperature of 200-800 DEG C; after the outcome is collected, the outcome is washed and dried; carbon matter residual on the surface is removed, thus gaining the carbon-mixed TiO2 nanometer material which has stable performance and the visible light photocatalytic activation. The preparation method optimizes the preparation process of the catalyst, the prepared carbon-mixed TiO2 photocatalytic has forbidden band width which can be excited by the radiation of visible light, realizes the wide spectrum response and is more applicable to the practical application in large scale.

Description

technical field [0001] The invention relates to a preparation method of a nanometer material, in particular to a preparation method of a carbon-doped titanium dioxide nanometer material with strong photocatalytic activity under visible light, and belongs to the field of inorganic nanometer photocatalytic materials. Background technique [0002] Semiconductor photocatalysis technology represented by titanium dioxide has shown broad application prospects in the degradation of organic pollutants, water splitting to produce hydrogen, self-cleaning surfaces, and antibacterial ceramics. The mechanism of semiconductor photocatalytic reaction is that by absorbing photons whose energy exceeds the energy corresponding to the band gap, the valence band electrons of the photocatalyst are excited to generate photogenerated holes and electrons, and then migrate to the surface of the catalyst to perform redox reactions with the adsorbed organic pollutants or water molecules. the process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J21/06
Inventor 蔡伟民龙明策陈超
Owner SHANGHAI JIAO TONG UNIV
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