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Preparation method of new type nano-titanium dioxide powder

A nano-titanium dioxide and sodium hydroxide technology, applied in the direction of titanium oxide/hydroxide, can solve the problems of limiting the excellent performance of the product, uneven particle size, easy agglomeration of the product, etc., and achieves low production cost, good whiteness, and purity. high effect

Inactive Publication Date: 2008-12-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, controlled hydrolysis and precipitation are mainly used in production. The advantages of these two types of methods are high production efficiency, low cost, and low pollution. The disadvantage is that these two types of methods use alkali precipitation or hydrolysis. Calcination, there are shortcomings such as uneven particle size, easy agglomeration of products, low purity, etc., which limit the exertion of many excellent properties of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 50ml of a solution of titanium tetrachloride hydrochloric acid (molar concentration is 2mol / L) with a molar concentration of 0.1mol / L, and add it to 400ml of aqueous solution containing 25ml of ammonia water. At this time, white Ti(OH) 4 Precipitation is formed, filtered, and washed with water for 2 to 3 times, until the washing liquid is detected by silver nitrate and no chloride ions exist, and the precipitated product is obtained. Add 1 g of citric acid to the obtained precipitated product and mix thoroughly to obtain a precursor. Put the precursor into a porcelain crucible and place it in a muffle furnace, slowly raise the temperature to 600°C, and calcinate for 1 hour to obtain a crude product. After the crude product was pulverized by a ball mill, 0.4 g of nano titanium dioxide powder was obtained. X-ray powder diffractometer (XRD) analysis results show that the product is anatase crystal structure; analyzed by transmission electron microscope, the particle ...

Embodiment 2

[0031] Take 50ml of hydrochloric acid (3mol / L) solution with a molar concentration of 5mol / L titanium sulfate, and add it to 400ml of water containing 20g of sodium hydroxide. At this time, white Ti(OH) 4 Precipitation is formed, filtered, washed with water for 2 to 3 times, until the washing liquid is detected by barium chloride and no chloride ions exist, and the precipitated product is obtained. Add 55 ml of formic acid to the obtained precipitated product, and mix thoroughly to obtain a precursor. Put the precursor into a porcelain crucible and place it in a muffle furnace, slowly raise the temperature to 650°C, and calcinate for 0.5h to obtain a crude nano-titanium dioxide product. The crude product was pulverized by air flow to obtain 19 g of nano titanium dioxide powder. Analyzed by X-ray powder diffractometer (XRD), the product is anatase nano titanium dioxide; analyzed by transmission electron microscope, the particle size of the product is 20nm. If the precursor is...

Embodiment 3

[0033] Get 50ml of hydrochloric acid (4mol / L) solution with a molar concentration of 5mol / L titanium tetrachloride, and add it to 400ml of water containing 50g of sodium carbonate, and white Ti(OH) 4 Precipitation is formed, filtered, and washed with water for 2-3 times until the washing liquid is detected by silver nitrate and no chloride ions exist, and the precipitated product is obtained. Add 27g of salicylic acid to the obtained precipitation product, mix well to obtain a precursor, put the precursor in a porcelain crucible, then put the porcelain crucible into a muffle furnace, slowly raise the temperature to 600°C, and calcinate for 1 hour to obtain nano-titanium dioxide crude product. After the crude product was pulverized by airflow, 10 g of the final product was obtained. Analyzed by X-ray powder diffractometer (XRD), the product is anatase nano titanium dioxide; analyzed by transmission electron microscope, the particle size of the product is 20nm. If the precurso...

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Abstract

A process for preparing TiO2 nanoparticles by solid-solid transform method includes such steps as adding the hydrochloric acid solution of Ti source to the aqueous solution of alkaline substance, regulating pH=7-8 to generate white Ti(OH)4 deposit, filtering, washing, adding organic acid, stirring to obtain precursor, and calcining in air at 550-650 deg.C for 0.5-1.5 hr to obtain anatase-type TiO2 nanoparticles or at 750-850 deg.C for 0.5-2.5 hr to obtain rutile-type TiO2 nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of nano titanium dioxide powder. Background technique [0002] Nano-titanium dioxide is a very important chemical raw material, which is divided into three crystal forms: anatase, rutile and brookite. As a new type of photocatalyst, anti-ultraviolet agent and photoelectric effect agent, anatase nano-titanium dioxide has shown broad application prospects in anti-mold and sterilization, air purification, deodorization, water treatment, and antifouling. Rutile nano-titanium dioxide has the advantages of high refractive index, good weather resistance, low photochemical activity, high hiding power, stable physical and chemical properties, etc. It is an indispensable raw material in the fields of electronics, light industry, and chemical industry. It is widely used in plastics, enamel, Artificial fibers, electronic materials, rubber, coatings...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/04
Inventor 吴介达刘金库章定钦章胜义
Owner TONGJI UNIV
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