Process for preparing hydrated sodium titanate and nano titanate tube series

A technology of hydrated sodium titanate and hydrated titanate, which is applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of complex production process, high price, limited application, etc., and overcome the problem of large particles and simple equipment , the effect of reducing production costs

Inactive Publication Date: 2002-11-13
TSINGHUA UNIV
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Problems solved by technology

The technology of preparing nanotubes of barium titanate and strontium titanate by combining sol-gel method and template method has also been reported recently, but the production process is complicated and the output is very limited, and the walls of nanotubes are mostly amorphous or Semi-crystalline (Chemistry of Materials, 2002, Volume 14, 480-482), which limits their application in catalysis etc.
The sol-gel method mostly uses organic titanium oxide compounds (titanates) as raw materials, and the price is relatively expensive

Method used

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  • Process for preparing hydrated sodium titanate and nano titanate tube series
  • Process for preparing hydrated sodium titanate and nano titanate tube series
  • Process for preparing hydrated sodium titanate and nano titanate tube series

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preparation example Construction

[0030] The preparation process of the present invention comprises the following three aspects:

[0031] 1. Preparation of hydrated sodium titanate nanotubes using titanium dioxide as raw material

[0032] The method for synthesizing hydrated sodium titanate nanotubes fully utilizes the properties of titanium dioxide as an acid anhydride, uses water as a medium, and reacts in NaOH concentrated solution.

[0033] Process steps: mix titanium dioxide with 3-15 mol / liter NaOH solution at a ratio of 0.5-3 g: 40 ml of solution, put them in a closed container, and conduct a hydrothermal reaction at 60-300°C for 3 hours to 8 days to obtain The product is washed with deionized water and dried to obtain nanotubes of hydrated sodium titanate.

[0034] Above-mentioned reaction is represented as follows with chemical equation:

[0035] (x=0.1-1)

[0036] 2. With metatitanic acid (H 2 TiO 3 ) as raw material to prepare hydrated sodium titanate nanotubes

[0037] The method for sy...

Embodiment 1

[0050] Embodiment 1: (titanium dioxide is the raw material preparation hydrated sodium titanate nanotube part)

[0051] Take 0.5 g of industrially produced titanium dioxide, add it to a 40 ml hydrothermal kettle, add 3 mol / L NaOH solution to the kettle, heat it at 300°C for 1 day, wash the white precipitate with deionized water, and dry it to obtain hydrated Nanotubes of sodium titanate salt. Its molecular formula can be expressed as: Na x h 2-x Ti 2 o 5 ·H 2 O(x=0.1-1)

[0052] Repeat the above operation steps, increase the concentration of lye to 15 mol / liter, heat at 300° C. for 3 hours, and obtain nanotubes of hydrated sodium titanate.

[0053] Repeat the above operation steps, increase the concentration of lye to 7 mol / liter, lower the temperature to 160° C., and heat in water for 3 days to obtain nanotubes of hydrated sodium titanate.

[0054] Repeat the above operation steps, increase the concentration of the lye to 15 mol / liter, lower the temperature to 60° C., ...

Embodiment 2

[0057] Embodiment 2: (preparation of hydrated sodium titanate nanotube part with metatitanic acid as raw material)

[0058] Take 0.5 g of industrially produced metatitanic acid, add it to a 40 ml hydrothermal kettle, add 3 mol / L NaOH solution to the kettle, heat it at 300°C for 1 day, wash the white precipitate with deionized water, and dry it. Nanotubes of sodium titanate hydrate were obtained. Its molecular formula can be expressed as: Na x h 2-x Ti 2 o 5 ·H 2 O(x=0.1-1)

[0059] Repeat the above operation steps, increase the concentration of lye to 15 mol / liter, heat at 300° C. for 3 hours, and obtain nanotubes of hydrated sodium titanate.

[0060] Repeat the above operation steps, increase the concentration of lye to 7 mol / liter, heat at 160°C for 3 days, and obtain nanotubes of hydrated sodium titanate.

[0061] Repeat the above operation steps, increase the concentration of lye to 15 mol / L, heat at 60°C for 8 days, and obtain nanotubes of hydrated sodium titanate....

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Abstract

A process for preparing the nanometre tubes of hydrated sodium titanate and titanate series includes such steps as hydrothermal reaction of TiO2 or metatitanic acid to obtain the nanometre tubes of hydrated sodium titanate, mixing them with the solution containing one or two kinds of metal ions to convert them to the nanometre tubes of hydrated titanate or composite hydrated titanates of the saidmetal ions, and thermal dewatering to obtain the nanometre tubes of corresponding titanate or composite titanates. Its advantages are uniform shape, large specific surface area, high thermal stability and regulatable catalytic performance.

Description

technical field [0001] The invention relates to a preparation method of a series of titanate and hydrated titanate (including titanate, hydrated titanate, composite titanate and hydrated composite titanate) nanotubes, belonging to the technical field of inorganic material preparation. technical background [0002] Due to the wide application of titanate materials as functional materials in piezoelectric materials, ferroelectric materials, solar energy conversion, photocatalysis and other fields, people have been exploring the synthesis of new titanate materials and new synthesis technologies of original titanate materials. . Nowadays, with the continuous promotion of nanotechnology, the preparation of nano titanate materials has become a hot spot that people pay attention to. [0003] The preparation of existing sodium titanate usually chooses the method of heating the mixture of sodium carbonate (or sodium nitrate, sodium oxalate) and titanium dioxide, such as the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C04B35/462
Inventor 李亚栋孙晓明
Owner TSINGHUA UNIV
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