High-specific-surface-area nano barium stannate preparation method

Abstract

The present invention discloses a high-specific-surface-area nano barium stannate preparation method, SnCl4.5H2O as a source of tin is dissolved in a 10% to 70% hydrogen peroxide solution, aqueous ammonia is used for adjusting pH to 7 to 12, barium carbonate is added as a barium source, and reaction is performed at 20-100 DEG C for 0.5-24h; and high purity barium stannate nanoparticles can be obtained by filtering, washing and drying, and then calcining the resulting powder at 500 DEG C. The raw materials are readily available and inexpensive, the operation method is simple, repeatability is good, the preparation method is low in reaction condition requirements, large-scale industrial production is easy, the obtained product is high in purity, good in crystallinity, small in particle size and narrow in distribution, the specific surface area is up to 80m<2> / g or more, and the high-specific-surface-area nano barium stannate fills gaps in the market, and has good market prospects.

Description

technical field [0001] The invention relates to a method for preparing a ceramic material, in particular to a method for preparing nano barium stannate with a high specific surface area. Background technique [0002] Barium stannate (BaSnO 3 ) is a perovskite-type ceramic material that has attracted extensive attention because of its good dielectric properties, optical properties, and thermal stability. Pure phase or doped BaSnO 3 Often used as thermally stable capacitors, dielectric ceramic components, La-doped BaSnO 3 is a good transparent conductor oxide (TCO); in addition, BaSnO 3 For various gases such as CO, NO x ,O 2 ,CO 2 ,H 2 O,H 2 ,C 2 h 5 OH,CH 3 SH,CH 4 It is very sensitive to liquefied petroleum gas and is an excellent gas-sensitive material. Pure phase BaSnO 3 The bandgap width is 3.1ev, and it has a good response ability to light. Its photocatalytic properties have become a research hotspot. When it is used as a material to make a dye-sensitized ...

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Problems solved by technology

[0003] The traditional preparation method of barium stannate is based on BaCO 3 and SnO 2 As a raw material, it is obtained by high-temperature calcination (>1200°C), but the product obtained by this method has large particles, severe agglomeration, and is easy to introduce impurities, which greatly affects its photoelectric performance.

In order to improve the performance of barium stannate powder, wet synthesis of BaSnO 3 It has been greatly developed, and the particle uniformity of the product obtained by the oxalate co-precipitation method is greatly improved, but the roasting temperature still needs to be above 1050°C; microemulsion method, citric acid complexation method, sol-gel method, alcohol salt hydrolysis method, etc. The calcination temperature can be reduced to 700-900°C, but its synthesis requires the use of a large amount of organic solvents or complexing agents, which leads to increased costs and limits its large-scale application; although the hydrothermal method and solvothermal method are relatively low in cost, they are Its production cycle is long, and it has high requirements for equipment (high pressure resistance)

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