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A kind of preparation method of nanometer titanium dioxide/tungsten trioxide composite powder

A technology of nano-titanium dioxide and composite materials, which is applied in the field of nano-material preparation, can solve the problems of uncontrollable particle size of composite materials, restrictions on mass production of composite materials, poor mixing of two materials, etc., and achieve excellent photocatalytic performance and synergistic Excellent photocatalytic performance and process controllable effect

Active Publication Date: 2020-07-17
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the spray pyrolysis and spin coating methods commonly used in the prior art have the disadvantages of high cost, cumbersome steps, and inconvenient operation, making TiO 2 / WO 3 High-volume production of composite materials is limited
At the same time, the TiO prepared by the above method 2 / WO 3 Composite materials also have disadvantages such as uncontrollable particle size, poor particle dispersion, high content of introduced impurities, poor mixing of two materials, and easy agglomeration of particles of the same material.

Method used

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  • A kind of preparation method of nanometer titanium dioxide/tungsten trioxide composite powder
  • A kind of preparation method of nanometer titanium dioxide/tungsten trioxide composite powder
  • A kind of preparation method of nanometer titanium dioxide/tungsten trioxide composite powder

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preparation example Construction

[0034] A preparation method of nano-titanium dioxide / tungsten trioxide composite material powder, comprising the following steps:

[0035] Step 1. After mixing concentrated nitric acid and distilled water, prepare a nitric acid solution with a concentration of 2-14mol / L, stir and mix thoroughly, and set aside;

[0036] The concentration of nitric acid is limited here, because if its concentration is too high, the reaction of tetrabutyl titanate added later will be insufficient, otherwise, the reaction of ammonium metatungstate will be insufficient.

[0037] Step 2. Add tetrabutyl titanate drop by drop to the nitric acid solution prepared in step 1, and stir while adding dropwise. The stirring rate is 600~1200r / min to obtain solution A. Tetrabutyl titanate in solution A The final concentration is 0.02 ~0.2mol / L;

[0038] In this step, the addition of tetrabutyl titanate needs to be carried out under stirring conditions, because tetrabutyl titanate and water easily react to for...

Embodiment 1

[0050] A preparation method of nano-titanium dioxide / tungsten trioxide composite material powder, comprising the following steps:

[0051] Step 1. After mixing concentrated nitric acid with distilled water, prepare 500ml of nitric acid solution with a concentration of 2mol / L, fully stir and mix, and set aside;

[0052] Step 2: Take 34g (that is, 0.1mol) tetrabutyl titanate, and at a stirring rate of 1000r / min, add tetrabutyl titanate drop by drop to the prepared product in step 1 by adding it dropwise while stirring. In nitric acid solution, make solution A, standby;

[0053] Step 3: Take 398.1g of ammonium metatungstate and add it to the solution A prepared in step 2, stir to make it completely mixed, and then get solution B for later use;

[0054] Step 4. Transfer the solution B prepared in step 3 to the polytetrafluoroethylene lining of the stainless steel hydrothermal kettle, and then put it into a drying oven for hydrothermal reaction. Control the drying oven to heat up ...

Embodiment 2

[0061] A preparation method of nano-titanium dioxide / tungsten trioxide composite material powder, comprising the following steps:

[0062] Step 1, after mixing concentrated nitric acid and distilled water, prepare 500ml of nitric acid solution with a concentration of 4mol / L, fully stir and mix, and set aside;

[0063] Step 2: Take 3.4g (that is, 0.01mol) of tetrabutyl titanate, and at a stirring rate of 600r / min, add tetrabutyl titanate drop by drop to step 1 to prepare In the nitric acid solution, make solution A, standby;

[0064] Step 3: Take 24.24g of ammonium metatungstate and add it to the solution A prepared in step 2, stir to make it completely mixed, and then get solution B for later use;

[0065] Step 4. Transfer the solution B prepared in step 3 to the polytetrafluoroethylene lining of the stainless steel hydrothermal kettle, and then put it into a drying oven for hydrothermal reaction. Control the drying oven to heat up to 200℃, hydrothermal reaction time is 15 h...

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Abstract

The present invention adopts a one-step hydrothermal method to carry out TiO 2 / WO 3 Synchronous preparation of composite powders is a brand new technology. Its technical bottlenecks are mainly the following two: 1. It can react to generate TiO 2 and WO 3 There are many raw materials, but it has not been reported that the raw materials can be effectively combined and the mixture of the two can be simultaneously generated through one-step hydrothermal process; 2. The raw material tetrabutyl titanate and water are easily reacted to form a gel, resulting in a large amount of agglomeration of the product. Preparation of TiO 2 Nanopowder is particularly difficult. This application uses unique step parameter control, through WO 3 The addition of particles makes the generated TiO 2 The powder is effectively dispersed, and the two powders can not only be fully mixed, but also interact with each other to promote the dispersion of each other's particles and the reduction of particle size.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a nano-TiO 2 / WO 3 The invention relates to a method for preparing composite material powder, which belongs to a technical application of preparing composite powder by hydrothermal method. Background technique [0002] TiO 2 Because of its strong oxidation ability, high photocatalytic activity, and stable physical and chemical properties, it is widely used in the fields of air purification, wastewater treatment, sterilization and self-cleaning. But TiO 2 In the photocatalytic reaction, there are problems such as low quantum efficiency, poor utilization of sunlight, high recombination probability of photogenerated carriers, difficult recycling, and low recycling rate, which limit its industrialization process. [0003] WO 3 It is a multifunctional material with various symmetric structures such as orthogonal, monoclinic, cubic, and hexagonal. It shows goo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C01G41/02B82Y40/00B82Y30/00B01J23/30
CPCB82Y30/00B82Y40/00C01G23/053C01G41/02B01J23/002B01J23/30C01P2004/03C01P2002/72C01P2004/62C01P2004/82C01P2004/50B01J35/39
Inventor 魏世忠潘昆明赵阳徐流杰陈冲张程毛丰周玉成李秀青王飞鸿杨艳萍王长记
Owner HENAN UNIV OF SCI & TECH
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