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Precious metal-doped titanium dioxide nanometer composite 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: 2018-11-30
NORTHEASTERN UNIV
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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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  • Precious metal-doped titanium dioxide nanometer composite material and preparation method thereof
  • Precious metal-doped titanium dioxide nanometer composite material and preparation method thereof
  • Precious metal-doped titanium dioxide nanometer composite 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 precious metal-doped titanium dioxide composite material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a gold nanosphere; S2, coating the surface of the gold nanosphere with a silica coating; S3, coating the surface of an Au-SiO2 core-shell nanometer compound with a titanium dioxide precursor coating; S4, removing aSiO2 core in an Au-SiO2-TiO2 precursor ternary core-shell nanometer compound; and S5, calcining an Au-TiO2 precursor yolk-structured nanometer compound so as to obtain the gold-doped titanium dioxidecomposite material. The preparation method of the invention is simple in process, easy to operate, low in production cost, small in process pollution and suitable for large-scale production; and theprepared precious metal-doped titanium dioxide composite material has high purity, good crystallinity, good monodispersity, uniform particle sizes, high utilization rate of solar energy and excellentphotocatalytic performance.

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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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
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