Method for preparing metal/titanium dioxide composite nano material at low temperature by gamma-irradiation

A composite nanomaterial and titanium dioxide technology, which is applied in the field of preparing metal/titanium dioxide composite nanomaterials, can solve the problems of low photocatalytic activity, difficulty in controlling particle size and morphology, poor product dispersibility, etc., and achieves high photocatalytic activity, Controllable morphology and stable properties

Inactive Publication Date: 2010-06-16
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of preparing metal / titanium dioxide composite materials in the prior art. High temperature reaction is required, a large amount of reducing agent or organic stabilizer needs to be introduced, and the resulting product has poor dispersion and low photocatalytic activity. The method has the problem of difficulty in controlling particle size and shape, and provides a method for preparing metal / titanium dioxide composite nanomaterials at low temperature by γ-irradiation

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  • Method for preparing metal/titanium dioxide composite nano material at low temperature by gamma-irradiation
  • Method for preparing metal/titanium dioxide composite nano material at low temperature by gamma-irradiation
  • Method for preparing metal/titanium dioxide composite nano material at low temperature by gamma-irradiation

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specific Embodiment approach 1

[0012] Specific embodiment 1: The method for preparing metal / titanium dioxide composite nanomaterials at low temperature by gamma-irradiation in this embodiment is carried out in the following steps: 1. Add the precursor of titanium to the alcohol, and prepare the concentration of the precursor of titanium to be 0.1-0.5 mol / L solution; 2. Take 10-50mL step 1 solution, add it dropwise to 10-50mL distilled water at room temperature under stirring condition, after the addition is completed, the water bath is heated to 60-80°C and continue stirring for 30-100min to obtain a slurry liquid; 3. The slurry liquid was separated by a centrifuge to obtain a precipitate, then added 50-300mL acid solution with a concentration of 0.05-5.0mol / L, sealed and stirred at 60-80°C for 4-20h, then added 100- 400mL distilled water to get TiO 2 Transparent sol; 4. Take 10-100mL TiO 2 For transparent sol, add 20-300μL of metal precursor solution with a concentration of 0.1-1mol / L and 3-20mL of isopr...

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, a solution with a titanium precursor concentration of 0.2-0.4 mol / L is prepared. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0015] Embodiment 3: This embodiment differs from Embodiment 1 in that in step 1, a solution with a titanium precursor concentration of 0.3 mol / L is prepared. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a method for preparing a metal / titanium dioxide composite nano material at low temperature by gamma-irradiation, which relates to a method for preparing a metal / titanium dioxide composite nano material. The invention solves the problems that the preparation of the metal / titanium dioxide composite material in the prior art needs a high-temperature reaction and needs to be introduced with a large amount of reducers or organic stabilizers, the obtained product has poor dispersivity and low photocatalytic activity, and the size and the pattern of metal particles generated by reduction are still difficult to control even if a gamma-irradiation reduction method is adopted. The method comprises the following steps of: (1) preparing a precursor solution of titanium; (2) preparing pulpous liquid; (3) preparing TiO2 transparent sol; (4) adding a metal precursor solution and isopropanol into the transparent sol to obtain mixed reaction liquid, introducing nitrogen gas and carrying out gamma-ray radiation reduction by a 60Co source after sealing to obtain metal / titanium dioxide composite sol; and (5) drying or coating to obtain the metal / titanium dioxide composite nano material. In the invention, the size and the distribution of the metal particles are controllable, a template agent does not need to be added, the high-temperature reaction is not needed, and the product has good dispersivity and high photocatalytic activity.

Description

technical field [0001] The invention relates to a method for preparing a metal / titanium dioxide composite nanometer material. Background technique [0002] The research on the preparation of metal / titanium dioxide composites mainly focuses on the controlled growth of size, morphology and metal particle dispersion, which can now be achieved by a variety of methods, such as chemical methods, electrochemical methods, sonochemical methods or photocatalysis. law etc. However, the reduction process of metal ions in these methods generally introduces a large amount of reducing agent, organic template agent or microemulsion system, etc., and requires high temperature reaction, and these substances are difficult to be completely separated from the system after the reaction. Part of it acts on the surface of the catalyst, which will inhibit its catalytic activity to a certain extent, resulting in poor dispersion of the obtained product and low photocatalytic activity. [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00B01J23/755B01J23/89B01J23/50B01J23/52B01J23/42
Inventor 王靖宇韩喜江李平伟张伟刘程赵弘韬
Owner HARBIN INST OF TECH
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