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an au-tio 2 Egg yolk structure nanocomposite and preparation method thereof

A technology of nanocomposite material and egg yolk structure, applied in the field of Au-TiO2 egg yolk structure nanocomposite material and its preparation, can solve the problems of easily causing oxidation and affecting the photocatalytic performance of the material, and achieves high product yield and is suitable for large-scale production. , the effect of improving utilization

Active Publication Date: 2020-08-21
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, although there are noble metal doping to modify titanium dioxide (for example, patents CN107899569A, CN107930620A), most of them deposit noble metals on the surface of titanium dioxide, and it is easy to cause oxidation and other effects during use, which greatly affects the photocatalysis of the material. performance

Method used

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  • an au-tio <sub>2</sub> Egg yolk structure nanocomposite and preparation method thereof
  • an au-tio <sub>2</sub> Egg yolk structure nanocomposite and preparation method thereof
  • an au-tio <sub>2</sub> Egg yolk structure nanocomposite and preparation method thereof

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Embodiment 1

[0034] refer to figure 1 , this embodiment provides an Au-TiO 2 The preparation method of egg yolk structure nanocomposite material, comprises the steps:

[0035] Step 1, preparing gold nanospheres. It is specifically prepared by the seed method, including the following sub-steps:

[0036] a1, 0.4mL concentration of 4.5mmol / L auric acid chloride solution (HAuCl 4 ) and 0.5 mL of sodium citrate solution with a concentration of 5 mmol / L were added to 20 mL of ultrapure water, stirred for 5 min, and mixed uniformly to obtain solution A.

[0037] a2, 0.55mL concentration is 0.15mol / L sodium borohydride solution (NaBH 4 ) into solution A, vigorously stirred for 2 h, and mixed uniformly to obtain solution B.

[0038] Wherein, during this stirring process, the HAuCl in solution A 4 solution as gold source, NaBH 4 The solution mainly acts as a reducing agent with HAuCl 4 The solution undergoes a reaction to reduce metallic gold (ie gold seeds). During the whole reaction proce...

Embodiment 2

[0062] This embodiment provides a kind of Au-TiO 2 The preparation method of egg yolk structure nanocomposite material, comprises the steps:

[0063] Step 1, using the seed method to prepare gold nanospheres. Specifically include the following sub-steps:

[0064] a1. Add 0.2mL of HAuCl with a concentration of 3mmol / L 4 Solution and 0.3 mL of sodium citrate solution with a concentration of 4 mmol / L were added to 10 mL of ultrapure water, stirred for 1 min, and mixed uniformly to obtain solution A.

[0065] a2. Add 0.3 mL of NaBH with a concentration of 0.01 mol / L 4 The solution was added to solution A, stirred vigorously for 1 h, and mixed uniformly to obtain solution B.

[0066] a3. Add 30mL of HAuCl with a concentration of 4mmol / L 4 solution, 5 mL of PVP with a concentration of 4% wt, 3 mL of KI solution with a concentration of 0.1 mol / L and 4 mL of AA solution with a concentration of 0.01 mol / L were dissolved in 80 mL of ultrapure water, vigorously stirred and mixed eve...

Embodiment 3

[0084] This embodiment provides a kind of Au-TiO 2 The preparation method of egg yolk structure nanocomposite material, comprises the steps:

[0085] Step 1, using the seed method to prepare gold nanospheres. Specifically include the following sub-steps:

[0086] a1. Add 0.6mL of HAuCl with a concentration of 6mmol / L 4 Solution and 0.7 mL of sodium citrate solution with a concentration of 7 mmol / L were added to 25 mL of ultrapure water, stirred for 10 min, and mixed uniformly to obtain solution A.

[0087] a2. Add 0.7 mL of NaBH with a concentration of 0.2 mol / L 4 The solution was added to solution A, stirred vigorously for 3 h, and mixed uniformly to obtain solution B.

[0088] a3. Add 70mL of HAuCl with a concentration of 7mmol / L 4 solution, 12mL of PVP with a concentration of 7%wt, 6mL of KI solution with a concentration of 0.4mol / L and 7mL of AA solution with a concentration of 0.15mol / L were dissolved in 150mL of ultrapure water, vigorously stirred and mixed evenly. ...

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Abstract

The invention relates to a kind of Au-TiO 2 Egg yolk structure nanocomposite material and its preparation method, wherein the preparation method includes the following steps: first prepare gold nanospheres, then coat the surface of the gold nanospheres to form a silica layer, and then coat the surface of the silica layer to form The titanium dioxide precursor mesoporous material layer is then removed, and finally hydrothermal treatment is performed to obtain Au‑TiO with a flaky branched structure on the surface. 2 Yolk structured nanocomposites. The preparation method in the present invention has simple and easy operation, low production cost, little process pollution, and is suitable for large-scale production. The prepared Au-TiO 2 The egg yolk structure nanocomposite has a unique movable core and a lamellar branched structure on its surface, which can increase the specific surface area of ​​the material, greatly enhance the photocatalytic performance of the material, and have a high utilization rate of solar energy.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a kind of Au-TiO 2 Egg yolk structure nanocomposite material and its preparation method. Background technique [0002] In recent years, titanium dioxide, as one of the typical photocatalyst materials, has been extensively studied in both breadth and depth. Although TiO 2 It has high catalytic activity and excellent application prospects, but due to its wide band gap (3.0-3.2eV), it can only be excited by ultraviolet light with a wavelength less than 388nm, while visible light, which accounts for 90% of sunlight, cannot be excited. When it is used, its practical application is greatly restricted. In addition, the recombination rate of photogenerated electrons and holes is high, and the utilization rate of photons is low, resulting in low photocatalytic efficiency, which greatly limits its application range. [0003] In order to improve the photocatalytic activity o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C02F1/32C02F101/30
CPCC02F1/32B01J23/52C02F2101/308B01J35/398B01J35/39
Inventor 付海涛弓梦丽杨晓红安希忠张浩李武发王文文
Owner NORTHEASTERN UNIV LIAONING
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