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Method for preparing high-purity brookite titanium dioxide with controlled appearance

A technology of brookite type and titanium dioxide, which is applied in the field of material chemistry and photocatalysis, can solve the problems of single shape, complicated steps, expensive raw materials, etc., and achieve the effect of simple steps, cheap raw materials and easy access to raw materials

Inactive Publication Date: 2010-11-10
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, although there are reports on the preparation of brookite-type nano-titanium dioxide with different shapes such as rods and nanotubes, there are still single-morphology and complicated steps (such as Wei Mingdeng et al. prepare brookite-type titanium dioxide with two-step hydrothermal method). Nano-titanium dioxide nanotubes), expensive raw materials (more organic alkoxides of titanium, titanium tetrachloride, titanium trichloride, etc.) and other problems
Using one-step hydrothermal method, low-cost titanium sulfate is used as raw material, and high-purity brookite nano-titanium dioxide with different shapes such as shuttle, rod, petal, and nanotube can be obtained by controlling the pH value and reaction temperature. to report

Method used

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  • Method for preparing high-purity brookite titanium dioxide with controlled appearance
  • Method for preparing high-purity brookite titanium dioxide with controlled appearance
  • Method for preparing high-purity brookite titanium dioxide with controlled appearance

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Embodiment 1

[0019] Under stirring state, add anhydrous sodium acetate to 0.4mol / L titanium sulfate solution, make the concentration of sodium acetate be 1.0mol / L, then adjust the suspension system with 1.0mol / L sodium hydroxide solution The pH value is 11; the suspension precursor obtained above is subjected to a hydrothermal reaction at 240°C for 6 days in a hydrothermal kettle, then taken out, washed, and dried to obtain a petal-shaped brookite-type titanium dioxide product with a purity of more than 99.0%.

Embodiment 2

[0021] Under stirring state, add anhydrous sodium acetate to 0.1mol / L titanium sulfate solution, make the concentration of sodium acetate be 1.0mol / L, then adjust the suspension system with 1.0mol / L sodium hydroxide solution The pH value is 9; the suspension precursor obtained above is subjected to a hydrothermal reaction at 300° C. for 4 days in a hydrothermal kettle, then taken out, washed, and dried to obtain a petal-shaped brookite-type titanium dioxide product with a purity of more than 99.0%. as attached figure 1 , 2 , 5a shown.

Embodiment 3

[0023] Under stirring state, add anhydrous sodium acetate to the titanium sulfate solution of 0.05mol / L, make the concentration of sodium acetate be 1.0mol / L, then adjust the suspension system with 1.0mol / L sodium hydroxide solution The pH value is 12; the suspension precursor obtained above is subjected to a hydrothermal reaction at 180° C. for 6 days in a hydrothermal kettle, then taken out, washed, and dried to obtain a brookite-type titanium dioxide product in the shape of a shuttle with a purity of more than 99.8%. as attached image 3 , 5 as shown in b.

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Abstract

The invention relates to the technical fields of material chemistry and photocatalysis, in particular to a method for preparing high-purity brookite titanium dioxide with controlled appearance, which comprises the following steps of: dripping a certain amount of anhydrous sodium acetate into a certain concentration of titanium sulfate solution with stirring, and dripping sodium hydroxide solution to adjust the pH of a mixed suspension system to 8 to 12; and performing a hydro-thermal reaction on a mixed suspension precursor obtained by the reaction in a hydrothermal kettle at the temperature of between 160 and 300 DEG C for 4 to 6 days, taking the precursor out, washing and drying the precursor to obtain the high-purity brookite titanium dioxide. The brookite titanium dioxide which is in petal, spindle and nanotube shapes can be prepared by controlling the pH value of a reaction system and the temperature of the hydro-thermal reaction. The method has the advantages of one-step hydrothermal method, simple operating steps and controlled appearance, high purity, low cost and capability of mass synthesis of products, and has the obvious economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and photocatalysis, and in particular relates to a preparation method of high-purity brookite-type titanium dioxide with controllable morphology. Background technique [0002] Titanium dioxide has a wide range of application prospects in many fields such as wastewater treatment, air purification, antibacterial and sterilization, and solar energy conversion due to its advantages of non-toxicity, low price, high photocatalytic efficiency, strong oxidation ability, and good stability. [0003] Titanium dioxide has three crystal forms: anatase, rutile and brookite. The research and application of anatase and rutile titanium dioxide are more extensive; brookite titanium dioxide has less research on its structure and properties because it is difficult to synthesize a pure phase by artificial methods. In addition, due to its instability, its application value has not been reflected in the ind...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 刘金华姜丽娜卢启芳修志亮张川江赵军
Owner QILU UNIV OF TECH
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