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 an

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
CPCB01J23/52B01J35/004B01J35/0086C02F1/32C02F2101/308
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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