A preparation method of mixed-phase nano tio2 with different colors

A mixed-phase, nano-technology, applied in chemical instruments and methods, titanium oxide/hydroxide, physical/chemical process catalysts, etc., can solve the problems of complex steps, high natural cost, harsh experimental conditions, etc., and achieve the preparation process. Simple, low cost, and the effect of expanding the scope of application

Inactive Publication Date: 2016-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-TiO 2 Some of them can indeed improve their photocatalytic activity, but they have gone through more complicated steps, and the experimental conditions are very harsh, so the cost is naturally high.
[0005] Heat treatment as a conventional means, in the TiO 2 It is also widely used in the modification of heat treatment, but generally a specific temperature (mostly 400°C-500°C) is selected as a transitional step in the experimental process, and there is no systematic study on the effect of simple heat treatment temperature on the water phase synthesis. Nano-TiO 2 How does the sample affect

Method used

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  • A preparation method of mixed-phase nano tio2 with different colors
  • A preparation method of mixed-phase nano tio2 with different colors
  • A preparation method of mixed-phase nano tio2 with different colors

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Experimental program
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Effect test

Embodiment 1

[0034] Under the condition of ice-water bath, add 12mL and 20mL prepared 8.0g / 100mL titanium sulfate solution and 4mol / L ammonia water to 100mL deionized water respectively, and magnetically stir the reaction system for 2 hours; centrifuge the stirred sol, and deionized water for solid precipitation Ultrasonic washing; take 100mL of the washed sol and dry it at 80°C to obtain white nano-TiO before heat treatment 2 solid( figure 1 ). The nano-TiO 2 Belongs to the amorphous state ( figure 2 ), no crystal structure was formed ( image 3 part a of ), the microstructure is TiO 6 octahedral aggregates, according to the quantum size effect, the TiO 2 There are only discrete energy levels, and there is no quasi-continuous band structure, so the band gap is very large ( Figure 7 ). Its specific surface area is as high as 328.55m 2 / g, so it has a strong adsorption effect on organic matter in the solution, but due to poor crystallinity and large band gap, it has almost no phot...

Embodiment 2

[0036] Under the condition of ice-water bath, add 12mL and 20mL prepared 8.0g / 100mL titanium sulfate solution and 4mol / L ammonia water to 100mL deionized water respectively, and magnetically stir the reaction system for 2 hours; centrifuge the stirred sol, and deionized water for solid precipitation Ultrasonic washing; take 100mL of the washed sol and dry it at 80°C to obtain white nano-TiO 2 solid, and then heat-treated at 200 °C for 3 h to obtain brown mixed-phase nano-TiO 2 ( figure 1 ). The nano-TiO 2 Most are amorphous ( figure 2 ), while anatase phase crystals began to nucleate, with an average particle size of 1.44nm ( image 3 part b), the specific surface area is up to 281.88m 2 / g. The TiO 2 has the highest and continuous visible light absorption ( Figure 5 ), and thus has the greatest degree of band bending, resulting in the narrowest bandgap ( Figure 7 ). The product also has a certain adsorption capacity, but due to poor crystallinity and low photocat...

Embodiment 3

[0038] Under the condition of ice-water bath, add 12mL and 20mL prepared 8.0g / 100mL titanium sulfate solution and 4mol / L ammonia water to 100mL deionized water respectively, and magnetically stir the reaction system for 2 hours; centrifuge the stirred sol, and deionized water for solid precipitation Ultrasonic washing; take 100mL of the washed sol and dry it at 80°C to obtain white nano-TiO 2 solid, and then heat-treated at 400 °C for 3 h to obtain yellow nano-TiO 2 ( figure 1 ). The nano-TiO 2 Belongs to anatase and amorphous mixed phase ( figure 2 ), the anatase phase crystals gradually grew up, and the average particle size increased to 8.90nm ( image 3 part c), the specific surface area is 161.18m 2 / g. The TiO 2 A bump appears in the visible light absorption spectrum ( Figure 5 ), indicating that it has an interband energy level ( Figure 7 ), which is also the main reason for the narrowing of its forbidden band width. The adsorption capacity of this product ...

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Abstract

The invention relates to a preparation method of mixed-phase nanometer TiO2 of different colors, the key technology of which is to heat-treat the amorphous nanometer TiO2 synthesized in one step in water phase at different temperatures. The specific method is as follows: first, Ti(SO4)2 solution and ammonia water are mixed and reacted under ice-water bath conditions to obtain TiO2 amorphous hydrate sol, which is washed by centrifugation, and then the sol is evaporated to dryness at low temperature to obtain nano-TiO2 in the amorphous phase. The evaporated amorphous nano-TiO2 solids were heat-treated at different temperatures to obtain amorphous and anatase mixed-phase nano-TiO2 with different colors. The present invention adopts the method of gradient heat treatment for the first time to prepare a series of mixed-phase nano-TiO2 of different colors. The continuous regulation of the band structure has excellent performance and positive significance in the photocatalytic degradation of organic pollutants, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of metal oxide functional materials, in particular to a mixed-phase nano-TiO with different colors 2 method of preparation. Background technique [0002] Nano-TiO 2 It is a new type of inorganic functional material with unique properties such as large specific surface area, high surface activity and good light absorption performance. Nano-TiO 2 The precious optical properties make it show good development prospects in the automotive industry and many other fields. Nano-TiO 2 It also has high chemical stability, thermal stability, non-toxicity, super hydrophilicity, non-migration, and can be in contact with food, so it is widely used in anti-ultraviolet materials, textiles, photocatalytic catalysts, self-cleaning glass , sunscreen, coatings, inks, food packaging materials, paper industry, aerospace industry, lithium batteries. [0003] Synthesis of nano-TiO in organic solvent phase 2 , the nanopar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047B01J21/06
Inventor 范晨尧王智宇钱国栋
Owner ZHEJIANG UNIV
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