Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing different colors of mixed phase nano TiO2

A mixed phase and color technology, applied in chemical instruments and methods, titanium oxide/hydroxide, physical/chemical process catalysts, etc., can solve the problems of high natural cost, harsh experimental conditions, complicated steps, etc., and achieve low cost , The preparation process is simple, and the effect of light absorption enhancement

Inactive Publication Date: 2014-09-10
ZHEJIANG UNIV
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods for 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing different colors of mixed phase nano TiO2
  • Method for preparing different colors of mixed phase nano TiO2
  • Method for preparing different colors of mixed phase nano TiO2

Examples

Experimental program
Comparison scheme
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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing different colors of mixed phase nano TiO2. The key technology is carrying out thermal treatment on amorphous nano TiO2 which is synthesized by a water phase in one step at different temperature. The method concretely comprises the following steps: firstly, mixing and reacting a Ti(SO4)2 solution and ammonia water under an ice-water bath condition to obtain amorphous hydrate sol of TiO2, centrifugally washing, and then evaporating the sol at low temperature, so as to obtain amorphous phase nano TiO2; respectively carrying out thermal treatment on evaporated amorphous phase nano TiO2 solid at different temperature, so as to obtain different colors of amorphous and anatase mixed-phase nano TiO2. A series of different colors of mixed phase nano TiO2 can be prepared by adopting a gradient heat treatment method for the first time. The method is simple to operate, available in raw materials, low in cost and friendly to environment. Continuous regulation of an energy band structure is achieved by the prepared different colors of mixed phase nano TiO2, and the mixed phase nano TiO2 has excellent performances and positive significance in 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01G23/047B01J21/06
Inventor 范晨尧王智宇钱国栋
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com