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

Method for preparing sol of high active Nano titanium dioxide

A nano-titanium dioxide, high-activity technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of low crystallization, high impurity content, low activity, etc., achieve reduced impurity content, simple process, sterilization and antibacterial and Effect of mildew prevention effect improvement

Active Publication Date: 2007-10-10
IRONMAN ENVIRONMENTAL TECH CO LTD
View PDF4 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the past, the related technical products involved in most of the patents often did not carry out more advanced treatment to improve their performance and activity after relatively simple technical synthesis. Therefore, the sol has some disadvantages. Pollution, in addition, the degree of crystallization is not high, the content of impurities (electrolyte, etc.) is high, the acidity or alkalinity is strong, it is corrosive, and the activity is low in dark state or weak light, etc.

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 sol of high active Nano titanium dioxide
  • Method for preparing sol of high active Nano titanium dioxide
  • Method for preparing sol of high active Nano titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1. prepare titania sol with titanyl sulfate high pressure hydrothermal

[0032] Weigh titanyl sulfate, add water and stir until transparent, add dropwise sodium hydroxide to adjust the pH to more than 9, continue to stir for more than 2 hours, then repeatedly filter and wash until there is no sulfate ion (detected by titration with 0.5M barium chloride solution), Then wash repeatedly with distilled water until neutral. Finally, add water to the filter cake, mix it, beat it, then transfer the slurry to a constant temperature heating reactor with a double jacket, add water and mix it, then add acid solution dropwise to make the pH 1.2, and stir at room temperature for more than 2 hours. Then degumming is carried out, the slurry is heated and stirred at 75 °C, and a nano-titanium dioxide sol with a certain degree of crystallization is obtained after 24 hours; then it is transferred to a closed pressure-resistant reactor, and the pressure is controlled at 5×10 5...

Embodiment 2

[0033] Example 2. Purification and removal of impurities and pH adjustment of titanium dioxide sol prepared by high-pressure hydrothermal method

[0034] Weigh titanyl sulfate, add water and stir until transparent, add ammonia water dropwise to adjust the pH to more than 9, continue to stir for more than 2 hours, then repeatedly filter and wash until there is no sulfate ion (detected by titration with 0.5M barium chloride solution), and then Repeatedly wash with distilled water until neutral. Finally, add water to the filter cake, mix it, beat it, then transfer the slurry to a constant temperature heating reactor with a double jacket, add water and mix it, then add acid solution dropwise to make the pH 1.0, and stir at room temperature for more than 2 hours. Then degumming is carried out, the slurry is heated and stirred at 65 °C, and a nano-titanium dioxide sol with a certain degree of crystallization is obtained after 20 hours; then it is transferred to a closed pressure-res...

Embodiment 3

[0035] Embodiment 3. Spectral analysis and structural analysis of titanium dioxide sol before and after purification and impurity removal

[0036] In order to show the performance changes before and after the dialysis treatment in Example 2, we carried out XRD, UV-visible light transmittance spectrum and infrared (FTIR) tests on it. Figure 2 is the XRD spectrum of titania sol before and after dialysis. The results show that before dialysis, in addition to the diffraction peak of anatase, there are several very sharp diffraction peaks (as shown by S in the figure). Compared with the standard spectrum, it can be known that its by NaNO 3 、Na 2 SO 4 It is caused by the crystallization of sodium salt (NaX), which is caused by the debonding agent (nitric acid) and the residual impurities of raw materials in the preparation process. After dialysis (as shown in the figure After), the diffraction peaks of these impurities are greatly weakened or even disappeared, and the diffraction...

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

No PUM Login to View More

Abstract

This invention discloses a method for preparing highly active titanium dioxide nanosol. The method comprises: (1) weighing titanium oxysulfate or titanium sulfate, adding water to dissolve, dropping base solution to adjust the pH value to above 8, and stirring adequately; (2) filtering, washing the precipitate until there is no sulfate ions, and repeatedly washing with distilled water to neutrality; (3) adding water to the precipitate, mixing uniformly, beating, transferring the slurry to a constant-temperature reaction kettle, adding water, mixing uniformly, dropping acid solution to adjust the pH value to 0.5-2.0, and stirring adequately at normal temperature; (4) stirring the slurry at 40-95 deg.C for 3-60 h; (5) performing high-pressure hydrothermal treatment. The obtained titanium dioxide nanosol is light blue, and does not have any odor or organic matter. Besides, the titanium dioxide nanosol has such advantages as high stability, high crystallinity, high activity, high light transmittance rate, low electron-cavity recombination, high antibacterial and moldproof ability, and no corrosion to matrix. The method has such advantages as simple process and easy operation.

Description

technical field [0001] The invention relates to the technical field of nano titanium dioxide sol, in particular to a preparation method of highly active nano titanium dioxide sol. Background technique [0002] Titanium dioxide has become the most widely used semiconductor material in the field of photocatalysis at home and abroad in recent years because of its high photocatalytic activity, corrosion resistance, stable properties, and non-toxicity. In recent years, with the improvement of living standards, people's requirements for health and the environment have gradually increased. Therefore, the domestic and foreign markets of titanium dioxide photocatalytic products in indoor air purification have expanded rapidly, especially new photocatalytic air purifiers and photocatalytic sprayers. Agents account for the majority of this market. Therefore, the development and production of highly active titanium dioxide photocatalytic materials and the expansion of their application...

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): C01G23/053
Inventor 李芳柏刘同旭
Owner IRONMAN ENVIRONMENTAL TECH CO LTD
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