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Preparation method of nano titanium dioxide

A nano-titanium dioxide and nano-titanium technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology and other directions, can solve the problems of easy coagulation, agglomeration, large surface activity, and coagulation of nanoparticles, and achieve excellent photocatalytic activity. , the technical route is simple, the effect of easy transportation

Active Publication Date: 2022-01-07
NINGBO NANOJP NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using the liquid phase method to prepare titanium dioxide nanocrystalline particles, due to the small size of nano titanium dioxide particles, there are a large number of defects on the surface, the surface activity is large, and it is in a thermodynamically unstable state. sink, unable to form a stable dispersion, and lose the unique properties of nanoparticles, resulting in great defects in practical applications
In addition, in order to limit the hydrolysis rate of the titanium source, it is often necessary to add a protective agent during the synthesis of titanium dioxide nanocrystalline particles in a water-soluble system. Such protective agents are usually organic complexes, which are easy to limit the prepared titanium dioxide nanocrystals. The photocatalytic efficiency of crystal particles reduces the contribution of dispersion control to the improvement of material performance, and it is also easy to cause environmental pollution
[0004] Affected by the preparation technology and synthesis process, the so-called nano-titanium dioxide powders currently on the market are large particles formed by the agglomeration of nano-sized particles, and are not really nano-titanium dioxide materials. These materials have poor dispersion in water, are opaque, It is easy to settle, resulting in great defects in practical applications; at the same time, the price of nano-titanium dioxide materials is generally high, and its price is dozens to hundreds of times that of micron and submicron titanium dioxide materials
Therefore, developed countries such as the United States, Japan, and Europe are very active in the research work on nano-titanium dioxide, and have invested a lot of manpower and material resources. However, nano-titanium dioxide materials with excellent performance have not been developed at low cost and on a large scale.

Method used

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  • Preparation method of nano titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, titanium dioxide powder was dispersed in 10 moles per liter of sodium hydroxide solution at a mass ratio of 1:50, and then the solution was transferred to a hydrothermal kettle and kept at 120 degrees Celsius for 24 hours to obtain sodium titanate nanotubes. Subsequently, the sodium titanate nanotubes obtained above were separated and washed, then put into 0.05 mole per liter of hydrochloric acid solution for hydrogen ion exchange for 2 hours, and then separated and dried to obtain one-dimensional structure nano titanate powder. Subsequently, the 25 percent hydrochloric acid solution and the one-dimensional structure nano titanic acid powder were mixed evenly according to the mass ratio of 0.25 to 1, and then put into the reaction kettle and sealed. Finally, the above reaction kettle was put into an oven and heated at 140 degrees Celsius for 16 hours to obtain a nano-titanium dioxide product.

[0042] figure 1 One-dimensional structure nano titanate nanotubes we...

Embodiment 2

[0051] First, disperse titanium dioxide powder in 5 moles per liter of sodium hydroxide solution at a mass ratio of 1 to 100, and then transfer the solution to a hydrothermal kettle at a constant temperature of 200 degrees Celsius for 24 hours to obtain a one-dimensional structure of nano titanic acid sodium. Subsequently, the sodium titanate obtained above was separated and washed, and then put into a 0.01 mole per liter hydrochloric acid solution for hydrogen ion exchange for 2 hours, and then separated and dried to obtain a one-dimensional structure nano titanate powder. Subsequently, mix the 10 percent hydrochloric acid solution and the one-dimensional structure nano titanic acid powder according to the mass ratio of 0.8 to 1, and then put it into the reaction kettle and seal it. Finally, the reaction kettle was put into a microwave oven, and microwaved at 160 degrees Celsius for 2 hours to obtain a nano-titanium dioxide product.

[0052] In Example 2, the nano titanic ac...

Embodiment 3

[0055] First, disperse titanium dioxide powder in 15 moles per liter of sodium hydroxide solution at a mass ratio of 1 to 20, and then transfer the solution to a hydrothermal kettle at a constant temperature of 150 degrees Celsius for 24 hours to obtain a one-dimensional structure of nano titanic acid sodium. Subsequently, the one-dimensional structure nano sodium titanate obtained above was separated and washed, and then put into 0.1 mole per liter of hydrochloric acid solution for hydrogen ion exchange for 6 hours, and then separated and dried to obtain one-dimensional structure nano titanate powder. Subsequently, mix the 20% hydrochloric acid solution and the one-dimensional structure nano titanic acid powder according to the mass ratio of 0.4 to 1, and then put it into the reaction kettle and seal it. Finally, the above reactor was put into an oil bath, and heated at 180 degrees Celsius for 10 hours to obtain a nano-titanium dioxide product.

[0056] In Example 3, the nan...

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Abstract

The invention discloses a preparation method of nano titanium dioxide. The preparation method comprises the following steps: (1) mixing a titanium oxide with a sodium hydroxide aqueous solution, and carrying out hydrothermal reaction to obtain nano sodium titanate with a one-dimensional structure; (2) carrying out acid exchange on the nano sodium titanate with the one-dimensional structure to obtain nano titanic acid powder with the one-dimensional structure; (3) mixing the nano titanic acid powder with the one-dimensional structure with a small amount of hydrochloric acid solution, and sealing in a reaction kettle; and (4) carrying out heat treatment on the sealed reaction kettle to obtain the nano titanium dioxide material.

Description

technical field [0001] The invention relates to a preparation method of nano titanium dioxide. Background technique [0002] Titanium dioxide has been widely concerned by industry and scientific research circles due to its rich sources, non-toxicity, and good stability. Recently, anatase-phase titanium dioxide has been considered as one of the most ideal photocatalytic materials and has been widely used in photocatalytic air purification and photocatalytic water treatment. The photocatalytic efficiency of anatase phase titanium dioxide is closely related to its size, morphology, degree of dispersion, crystallinity, etc. Generally speaking, small particle size has a large specific surface area, which can absorb more organic matter, and usually shows higher The photocatalytic efficiency; similarly, the greater the degree of dispersion of particles, the more conducive to the improvement of photocatalytic efficiency. [0003] When using the liquid phase method to prepare titan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y30/00B82Y40/00
CPCC01G23/053B82Y30/00B82Y40/00C01P2004/03C01P2002/72C01P2004/01
Inventor 梁先华
Owner NINGBO NANOJP NEW MATERIAL TECH CO LTD
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