Preparation method for rare earth element-doped titanium dioxide nano material

A rare earth element and titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of inconspicuous photocatalytic activity, low ratio of rare earth atoms, low doping utilization rate of rare earth elements, etc. And the effect of simple process, wide adjustable range of parameters, and high performance of photocatalytic decomposition of organic pollutants

Inactive Publication Date: 2013-03-27
SHANGHAI NAT ENG RES CENT FORNANOTECH
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AI Technical Summary

Problems solved by technology

However, in some previous preparation methods, the doping utilization rate of rare earth elements is not high, and the proportion of rare earth atoms that can successfully replace the lattice sites in titanium dioxide is low, so the photocatalytic activity is not significantly improved.
And, the preparation method of co-doping titanium dioxide with two kinds of rare earth elements is rarely reported at present; there is no report about the preparation method of co-doping titanium dioxide with more than three rare earth elements

Method used

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  • Preparation method for rare earth element-doped titanium dioxide nano material
  • Preparation method for rare earth element-doped titanium dioxide nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1 g of urea and 0.5 g of lanthanum nitrate hexahydrate sequentially into 80 ml of absolute ethanol. After stirring to dissolve, add 12 ml of isopropyl titanate and stir evenly. Then, 7 ml of deionized water was added dropwise to the above system while stirring until a transparent gel was formed. The above gel was put into a Teflon-lined stainless steel autoclave for hydrothermal reaction at 170 °C for 48 h. After the reaction, the precipitated product is washed with deionized water until the pH of the washing liquid is neutral, and then dried to obtain the target rare earth element-doped titanium dioxide nanomaterial.

[0021] The obtained rare earth-doped titanium dioxide nanometer material is a highly dispersed nanocrystal grain with a particle diameter of about 8-10 nanometers and uniform size. The degradation rate of 0.1 gram of the above product to a 20 mg / L methyl orange solution under 300 watts of ultraviolet light in 40 minutes can reach more than 99%.

Embodiment 2

[0023] Add 0.5 g of urea, 0.3 g of lanthanum nitrate hexahydrate, and 0.02 g of cerium nitrate hexahydrate in sequence in 50 ml of absolute ethanol. After stirring to dissolve, add 8 ml of n-tetrabutyl titanate and stir evenly. Then, 4 ml of deionized water was added dropwise to the above system while stirring until a transparent gel was formed. The above gel was put into a Teflon-lined stainless steel autoclave for hydrothermal reaction at 150 °C for 24 h. After the reaction, the precipitated product is washed with deionized water until the pH of the washing liquid is neutral, and then dried to obtain the target rare earth element-doped titanium dioxide nanomaterial.

[0024] The obtained rare earth-doped titanium dioxide nanometer material is a highly dispersed nanocrystal grain with a particle diameter of about 5-7 nanometers and uniform size. The degradation rate of 0.1 gram of the above-mentioned product to 20 mg / L methyl orange solution reaches more than 99% within 30 ...

Embodiment 3

[0026] Add 1.2 g of urea, 0.1 g of gadolinium nitrate hexahydrate, and 0.05 g of neodymium nitrate hexahydrate in sequence in 100 ml of absolute ethanol. After stirring to dissolve, add 15 ml of tetraethyl titanate and stir well. Then, 8 ml of deionized water was added dropwise to the above system while stirring until a transparent gel was formed. The above gel was put into a Teflon-lined stainless steel autoclave for hydrothermal reaction at 200 °C for 16 h. After the reaction, the precipitated product is washed with deionized water until the pH of the washing liquid is neutral, and then dried to obtain the target rare earth element-doped titanium dioxide nanomaterial.

[0027] The obtained rare earth-doped titanium dioxide nanometer material is a highly dispersed nanocrystal grain with a particle diameter of about 7-9 nanometers and uniform size. The degradation rate of 0.1 gram of the above product to 20 mg / L methyl orange solution under 300 watts of ultraviolet light for...

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Abstract

The invention relates to a preparation method for a rare earth element-doped titanium dioxide nano material. The method comprises the steps of dissolving urea and rare earth element nitrate in absolute ethyl alcohol; adding liquid titanium source into the above solution to form a homogeneous solution; adding deionized water with stirring to form a transparent gel; performing hydro-thermal treatment on the above gel; washing, filtering and drying to obtain the rare earth element-doped titanium dioxide nano material. An object of doping titanium dioxide by using the rare earth element is realized through automatic regulation and control of pH value of a reaction system by slow decomposition of urea in the hydrothermal process. The preparation method is simple in process and flow, has wide parameter adjustable range, strong repeatability and low cost, and can be used for preparing different rare earth element-doped titanium dioxide nano materials or a plurality of the rare earth elements co-doped titanium dioxide nano material.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide nano material, in particular to a preparation method of a rare earth element-doped titanium dioxide nano material, and belongs to the technical field of inorganic nano material preparation. Background technique [0002] Due to its stable photochemical properties, high catalytic efficiency, strong oxidation ability, non-toxic and harmless, low price, simple process flow in practical applications, easy control of operating conditions, and no secondary pollution, titanium dioxide has been widely used as a photocatalyst. growing attention. Developed countries such as Europe and the United States have invested funds and research efforts in the research and development of titanium dioxide photocatalytic technology, and high-tech industries based on this are also taking shape. [0003] As a semiconductor functional material, titanium dioxide's photocatalytic activity is mainly determined by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y30/00
Inventor 赵斌陈超林琳曾琦琪何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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