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Preparation method of titanium dioxide coated nano-copper with core-shell structure

A technology of titanium dioxide and core-shell structure is applied in the field of photocatalytic nanomaterials, which can solve the problems of easy recombination of photogenerated holes, low utilization rate of sunlight, and influence on the process of industrialization of heterogeneous photocatalytic reactions.

Inactive Publication Date: 2013-07-24
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to TiO 2 The band gap is wide (about 3.2ev), TiO 2 The absorption threshold is less than 400nm, the utilization rate of sunlight is not high, and the photogenerated electrons and photogenerated holes on the surface of the material are easy to recombine, which affects the TiO 2 Process of Industrialization of Heterogeneous Photocatalytic Reaction

Method used

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  • Preparation method of titanium dioxide coated nano-copper with core-shell structure
  • Preparation method of titanium dioxide coated nano-copper with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of copper nanoparticles:

[0020] Take 100ml 0.04M CuSO 4 Add the aqueous solution to the same volume of 0.13M NaBH 4 In the solution, the mixed solution was mixed at room temperature for 1 minute, and the obtained precipitate was centrifuged at 11,500 rpm for 10 minutes, and then washed with distilled water and absolute ethanol for 3 times respectively, and the washed product was dried in a vacuum oven at a temperature of 30°C 12h;

[0021] Titanium dioxide coated nano-copper:

[0022] Dissolve 0.016 g of the prepared nano-copper particles in 50 ml of absolute ethanol solution, and ultrasonicate for 5 minutes to obtain a mixed solution;

[0023] Dissolve 0.74ml of isopropoxytitanium solution in 50ml of absolute ethanol solution, add dropwise to the mixed solution of nano-copper in absolute ethanol under stirring, continue to stir, and react for 1 hour to obtain the mixed solution;

[0024] Add the solution with a volume ratio of 0.09 (water / absolute eth...

Embodiment 2

[0027] Preparation of copper nanoparticles:

[0028] Take 50ml 0.4M L-ascorbic acid solution and add dropwise to 50ml 10mM CuCl 2 2H 2 In the O solution, keep the temperature at 80°C in an oil bath, continue to stir and react for 16 hours, centrifuge the obtained precipitate at 11500rpm for 10 minutes, then wash with distilled water and absolute ethanol for 3 times respectively, and put the washed product in Dry in a vacuum oven at 30°C for 12 hours;

[0029] Titanium dioxide coated nano-copper:

[0030] Take 0.0176 g of the prepared nano-copper particles and dissolve them in 50 ml of absolute ethanol solution, and ultrasonicate for 5 minutes to obtain a mixed solution;

[0031] Dissolve 1.5ml of isopropoxytitanium solution in 50ml of absolute ethanol solution, and add dropwise to the mixed solution of nano-copper in absolute ethanol under stirring. After the addition is completed, continue to stir and react for 2 hours to obtain mixed solution;

[0032] Add the solution ...

Embodiment 3

[0035] Preparation of copper nanoparticles:

[0036] Under stirring, add the hydrazine solution dropwise to 45ml of 0.43mM copper chloride solution (the molar ratio of hydrazine to copper chloride solution is 20), the reaction temperature is maintained at 35°C, when the color of the solution changes from blue to When it is yellow, there are nano-copper particles. Centrifuge the obtained precipitate at 11,500 rpm for 10 minutes, then wash with distilled water and absolute ethanol for 3 times respectively, and dry the washed product in a vacuum drying oven at a temperature of 50°C for 4 hours;

[0037] Titanium dioxide coated nano-copper:

[0038] Dissolve 0.0224 g of the prepared nano-copper particles in 50 ml of absolute ethanol solution, and ultrasonicate for 5 minutes to obtain a mixed solution;

[0039] Dissolve 3.0ml of isopropoxytitanium solution in 50ml of absolute ethanol solution, and add it dropwise to the mixed solution of nano-copper in absolute ethanol under stirr...

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Abstract

The invention provides a preparation method of titanium dioxide coated nano-copper with a core-shell structure. The preparation method can be used for forming the nanocomposite with the core-shell structure by coating titanium dioxide on nano-copper particles. The preparation method is based on the principle of in-situ hydrolysis, and comprises the steps of mixing the nano-copper particles, which are taken as a nuclear material, with a titanium source, and then forming a layer of shell structure on the surfaces of the nano-copper particles by virtue of the high hydrolysis of the titanium source. The preparation method has the characteristics of few raw material types, simplicity and convenience in operation, simple process, environmental protection and the like, and the prepared nanocomposite has photocatalytic performance and an obvious degradation effect on organic pollutants, such as 2,4-dichlorophen, in visible and ultraviolet light respectively, thus having a certain actual application value.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide-coated nano-copper with a core-shell structure, which is a preparation method of a nano-composite with nano-copper particles as the core and titanium dioxide as the shell, and belongs to the field of photocatalytic nano-materials. Background technique [0002] As the most commonly used photocatalytic material, titanium dioxide can effectively degrade pollutants in water bodies under the action of ultraviolet light because of its non-toxicity and good stability. However, due to TiO 2 The band gap is wide (about 3.2ev), TiO 2 The absorption threshold is less than 400nm, the utilization rate of sunlight is not high, and the photogenerated electrons and photogenerated holes on the surface of the material are easy to recombine, which affects the TiO 2 Process of industrialization of heterogeneous photocatalytic reaction. [0003] Due to the characteristics of small size, large specific su...

Claims

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Application Information

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IPC IPC(8): B01J23/72
Inventor 范晓芸王贞华宁王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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