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Method for preparing sol of neutral Nano titanium dioxide

A nano-titanium dioxide, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of corrosion and damage of substrates, increase environmental protection costs, limit the scope of application, etc., and achieve strong adhesion, easy operation, and simple process. Effect

Inactive Publication Date: 2007-10-10
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

These methods can produce stable and transparent sols with high activity. However, since the synthesis process introduces organic matter, strong acids or strong bases, on the one hand, it will cause organic pollution, discharge of acidic or alkaline wastewater, and increase environmental protection costs; On the other hand, due to the acidity or alkalinity of the obtained product, it is easy to cause corrosion damage to the substrate during the application process, thus greatly limiting the application range of the product.

Method used

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  • Method for preparing sol of neutral Nano titanium dioxide
  • Method for preparing sol of neutral Nano titanium dioxide
  • Method for preparing sol of neutral Nano titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1. prepare titania sol with tetrabutyl orthotitanate as raw material

[0034] Tetrabutyl orthotitanate is used as raw material, ethanol is used as solvent, and acetic acid is used as catalyst. Add 80ml of absolute ethanol dropwise to 20ml of tetrabutyl orthotitanate under vigorous stirring to prepare solution A, uniformly mix 10ml of water, 84ml of ethanol and 15ml of acetic acid to prepare solution B; Drop into B. After the dropwise addition, stop stirring to obtain light yellow transparent TiO 2 Sol. The sol was aged under natural conditions to form a gel, which was dried at 55°C to obtain an amorphous titanium dioxide solid. Add water to the amorphous titanium dioxide to make a suspension, stir constantly, slowly add hydrogen peroxide, wherein the ratio of hydrogen peroxide to titanium dioxide is 1.5, and then place it in an ultrasonic machine for ultrasonic treatment for 1 hour until dissolved to obtain a yellow solution. Transfer the yellow solution ...

Embodiment 2

[0035] Embodiment 2. With Ti(OBu) 4 Preparation of titania sol as raw material

[0036] Take Ti(OBu) 4 As a raw material, ethanol is used as a solvent and acetic acid is used as a catalyst. Add 80ml of absolute ethanol dropwise to 17ml of Ti(OBu) under vigorous stirring 4 Solution A was prepared in , and solution B was prepared by uniformly mixing 10ml of water, 84ml of ethanol and 15ml of acetic acid; then A was dropped into B under vigorous stirring. After the dropwise addition, stop stirring to obtain light yellow transparent TiO 2 Sol. The sol was accelerated to gel formation under microwave conditions, and it was dried at 50°C to obtain amorphous titanium dioxide solid. Add water to the amorphous titanium dioxide to make a suspension, stir constantly, slowly add hydrogen peroxide, wherein the ratio of hydrogen peroxide to titanium dioxide is 1.0, and then place it in an ultrasonic device for ultrasonic treatment for 1.5 hours until dissolved to obtain a yellow soluti...

Embodiment 3

[0037] Embodiment 3. Taking titanyl sulfate as raw material in different H 2 o 2 / TiO 2 Compared to the light transmittance of prepared titanium dioxide sol

[0038]Weigh 90g of titanyl sulfate solid (purity is 93%), add water to beat and mix, stir until transparent; add excess sodium hydroxide solution dropwise to adjust the pH to above 10, stir for 2 hours, then repeatedly filter and wash until there is no sulfate ion (Titration detection with 0.5M barium chloride solution), and then repeatedly washed with distilled water until neutral, so that the impurity ions can be basically removed. Add water to the amorphous titanium dioxide precipitate to make a suspension, keep stirring, and slowly add hydrogen peroxide, wherein the ratio of hydrogen peroxide to titanium dioxide is 0.5, 1.0, 1.5, 2.0 and 2.5 respectively, and then place them in an ultrasonic machine for ultrasonic treatment for 1 hours until dissolved to give a yellow solution. The yellow solution was transferred...

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Abstract

This invention discloses a method for preparing neutral titanium dioxide nanosol. The method comprises: (1) preparing amorphous titanium dioxide; (2) dispersing and dissolving amorphous titanium dioxide; (3) performing hydrothermal treatment to obtain neutral titanium dioxide nanosol. The obtained neutral titanium dioxide nanosol (below 10 nm) is transparent and golden, and does not have any odor. Besides, the neutral titanium dioxide nanosol has such advantages as high stability, certain crystallinity, high specific surface area, high adhesiveness, reduced particle sizes after doped with transition metal, and high utility of visible light. The method has such advantages as wide raw materials and easy operation, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of nano-titanium dioxide sol, in particular to a preparation method of neutral 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. The current photocatalysis industry still has huge market potential. It has attractive application prospects in the fields of indoor air purification, sterilization, antibacterial and mildew prevention, and crop disease prevention and control. [0003] Titanium dioxide sol, as a new type of photocatalytic product with small particles, high activity and convenient spray coating, has attracted extensive attention from the academic and commercial circles in recent years. Scientists at home and abroad have carried out the synthesis and app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 李芳柏刘同旭
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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