Method for low-temperature synthesis of titanium dioxide nano powder

A titanium dioxide and nano-powder technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology and other directions, can solve the problems of uneven powder particle size, long production cycle, wide distribution, etc., and achieve short production cycle, Small environmental pollution and small particle size

Inactive Publication Date: 2008-05-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although there are many methods for preparing titanium dioxide powder, such as chemical co-precipitation, sol-gel method, hydrothermolysis, reverse micellar method, hydrothermal synthesis, chemical vapor deposition, etc., among them, wet chemical methods such as chemical co-precipitation vary depending on the process. The process is simple and widely used, but there are disadvantages such as uneven particle size and wide distribution of powder, long production cycle, high energy consumption and serious pollution due to the difficulty in controlling the precipitation process.

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  • Method for low-temperature synthesis of titanium dioxide nano powder

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Embodiment 1

[0030] Prepare a deionized aqueous solution of ammonium polyacrylate at a molar concentration of 0.001M; weigh 16.8 g of analytically pure sodium hydroxide and 32 g of chemically pure titanyl sulfate at a molar ratio of 2.1:1; dissolve the weighed titanyl sulfate in a concentration of In the ammonium polyacrylate solution of 150ml of 0.001M, stir evenly, dry in drying oven, obtain the solid mixture containing ammonium polyacrylate and titanium; In stirring mill, add sodium hydroxide, then this solid mixture is added to Stirring in the mill, and stirring and grinding for 5 minutes, the rotating speed of the stirring rod is 100rpm, and the white powder is obtained; the reaction product is washed and precipitated for 10 minutes, and then the precipitate is dried in an oven at a temperature of 325K, and the holding time is 3 hours. Obtain nano-titanium dioxide powder; then conduct transmission electron microscope observation; the analysis results show that the transmission electron...

Embodiment 2

[0032] Prepare a deionized aqueous solution of polyethylene glycol 4000 at a molar concentration of 0.1M; weigh 16.8 g of analytically pure sodium hydroxide and 32 g of chemically pure titanyl sulfate at a molar ratio of 2.1:1; dissolve the weighed titanyl sulfate in Concentration is in the polyethylene glycol 4000 solution of 300ml of 0.1M, stir well, dry in drying box, obtain the solid mixture containing polyethylene glycol 4000 and titanium; In stirring mill, add sodium hydroxide, then The solid mixture was gradually added to the stirring mill, stirred and ground for 5 minutes, and the rotating speed of the stirring rod was 600rpm, and a white powder was obtained; the reaction product was washed and precipitated for 360 minutes, and then the precipitate was dried in an oven at a temperature of 385K, and the drying time was 24 hours; place the dried material in a silicon carbide rod furnace, heat it to 473K at a heating rate of 10K / min and keep it warm for 6 hours, then cool ...

Embodiment 3

[0034] Prepare a deionized aqueous solution of Tween 80 at a molar concentration of 0.05M; weigh 180 g of analytically pure sodium hydroxide and 24 g of chemically pure titanyl sulfate at a molar ratio of 30:1; dissolve the weighed titanyl sulfate in a concentration of 0.05 In the Tween 80 solution of 500ml of M, stir evenly, dry in drying box, obtain the solid mixture containing Tween 80 and titanium; In stirring mill, add sodium hydroxide, then add this solid mixture gradually Grinding, stirring and grinding for 30min, the rotating speed of the stirring bar is 600rpm, and the white powder is obtained; the reaction product is washed and precipitated for 60min, and then the precipitate is dried in an oven at a temperature of 355K, and the drying time is 12 hours; In a silicon carbon rod furnace, heat at a heating rate of 5K / min to 773K for 6 hours and then cool with the furnace to obtain a white powder; the obtained white powder does not need to be ground and crushed, and can b...

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Abstract

The invention discloses a method for synthesizing titanium dioxide nanometer powder at low temperature, and belongs to the technical field of material powder preparation. In this method, titanyl sulfate is first dissolved in an appropriate amount of deionized water containing organic additives, stirred evenly, and then the solvent is evaporated and concentrated to obtain a uniform solid mixture containing titanium and organic additives; the solid mixture is gradually added to an appropriate excess of hydroxide Stir, grind and mix in sodium. The mixing material is washed with deionized water and left to stand to obtain a precipitate, which is then filtered, washed with water, dried and calcined to obtain a high-purity titanium dioxide nano-powder with good dispersibility. The method of the invention has the advantages of simple and easy controllable process parameters, uniform particle size, adjustable particle size, resource saving, little pollution and the like.

Description

technical field [0001] The invention relates to a method for synthesizing titanium dioxide nanometer powder at low temperature, which belongs to the field of material science, and in particular relates to the technical field of nanometer powder preparation. technical background [0002] Nano-ceramic is a new type of ceramic material solidified by particles with a particle size of nanometer size (1nm-100nm). Its grain size, pore size, defect size and grain boundary width should be limited to the nanometer level, and it has unique properties different from traditional ceramics. Among them, the grain size has a very significant impact on the performance of ceramics. The reduction of the grain size will increase the mechanical properties of the material by an order of magnitude, and at the same time help to improve the toughness and plasticity of the material. Therefore, the preparation of nanopowders has become the basis of nanoceramic research. The particle shape, particle s...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82B3/00C04B35/46
Inventor 谭强强袁章福张军玲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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