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A kind of noble metal doped titanium dioxide nanocomposite material and preparation method thereof

A titanium dioxide and composite material technology, applied in the field of nanomaterials, can solve the problems of less than 10% solar energy utilization rate, affecting the photocatalytic performance of materials, increasing oxygen vacancies, etc., to inhibit particle growth and condensation process, suitable for large-scale production, The effect of improving utilization

Active Publication Date: 2020-09-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But a single TiO 2 Because of the wide band gap, nanomaterials can only absorb ultraviolet light with a shorter wavelength, and the utilization rate of solar energy is less than 10%.
(3) Cause lattice defects and increase oxygen vacancies
However, the deposition of precious metals on the surface is easy to cause oxidation and other effects during use, which greatly affects the photocatalytic performance of the material.

Method used

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  • A kind of noble metal doped titanium dioxide nanocomposite material and preparation method thereof
  • A kind of noble metal doped titanium dioxide nanocomposite material and preparation method thereof
  • A kind of noble metal doped titanium dioxide nanocomposite material and preparation method thereof

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Embodiment 1

[0033] refer to figure 1 , the present embodiment provides a method for preparing a noble metal-doped titanium dioxide composite material, comprising the following steps:

[0034] S1. Preparation of gold nanospheres by seed method.

[0035] Specifically, step S1 includes the following sub-steps:

[0036] S11, the chloroauric acid solution (HAuCl 4 ) and 0.55 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] S12, the 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 process, the sodium citrate solution in the soluti...

Embodiment 2

[0073] This embodiment provides a method for preparing a noble metal-doped titanium dioxide composite material, comprising the following steps:

[0074] S1. Preparation of gold nanospheres by seed method.

[0075] Specifically, step S1 includes the following sub-steps:

[0076] S11, 0.25 mL of HAuCl with a concentration of 3 mmol / L 4 Solution and 0.35 mL of sodium citrate solution with a concentration of 4 mmol / L were added to 12 mL of ultrapure water, stirred for 1 min, and mixed uniformly to obtain solution A.

[0077] S12, 0.25 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.

[0078] S13, 25mL of HAuCl with a concentration of 3.5mmol / L 4 solution, 5.2mL of PVP with a concentration of 4%wt, 2.8mL of KI solution with a concentration of 0.1mol / L and 3.5mL of AA solution with a concentration of 0.01mol / L were dissolved in 75mL of ultrapure water, vigorously stirred an...

Embodiment 3

[0098] This embodiment provides a method for preparing a noble metal-doped titanium dioxide composite material, comprising the following steps:

[0099] S1. Preparation of gold nanospheres by seed method.

[0100] Specifically, step S1 includes the following sub-steps:

[0101] S11, 0.65 mL of HAuCl with a concentration of 6 mmol / L 4 solution and 0.75 mL of sodium citrate solution with a concentration of 7 mmol / L were added to 27 mL of ultrapure water, stirred for 10 min, and mixed uniformly to obtain solution A.

[0102] S12, 0.75 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.

[0103] S13, the 75mL concentration is 7mmol / L HAuCl 4 solution, 13mL of PVP with a concentration of 7%wt, 6.5mL of KI solution with a concentration of 0.4mol / L and 7.2mL of AA solution with a concentration of 0.15mol / L were dissolved in 148mL of ultrapure water, vigorously stirred and mixed ...

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Abstract

The invention relates to a noble metal-doped titanium dioxide composite material and a preparation method thereof, wherein the preparation method includes the following steps: S1. Preparing gold nanospheres. S2. Coat the surface of the gold nanosphere to form a silica coating. S3, in Au‑SiO 2 Surface coating of core-shell nanocomposites forms a titanium dioxide precursor coating. S4. Removal of Au‑SiO 2 ‑TiO 2 SiO in precursor ternary core-shell nanocomposite 2 Kernel. S5. For Au‑TiO 2 The precursor egg yolk structure nanocomposite is calcined to obtain a gold-doped titanium dioxide composite material. 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 precious metal-doped titanium dioxide composite product has high purity, good crystallization, good monodispersity, and uniform particles. Solar energy has a high utilization rate and excellent photocatalytic properties.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a noble metal-doped titanium dioxide composite material and a preparation method thereof. Background technique [0002] Among known semiconductor materials, TiO 2 Due to its high oxidation activity, chemical stability, non-toxicity, low cost, and easy preparation, it has become one of the most promising photocatalysts. But a single TiO 2 Because of the wide band gap, nanomaterials can only absorb ultraviolet light with a shorter wavelength, and the utilization rate of solar energy is less than 10%. In addition, the recombination rate of electrons and holes generated by photoexcitation is high, making TiO 2 The low photon quantum yield greatly limits its degradation rate. [0003] To solve this problem, people try to modify titanium dioxide to increase the spectral absorption range, reduce the recombination of photogenerated electrons and holes, and enh...

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吴镇湘王文文
Owner NORTHEASTERN UNIV LIAONING
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