Preparation method for triphase mixed crystal titanium dioxide materials

A titanium dioxide and mixed technology, applied in the field of photocatalysis, can solve the problems of unfavorable popularization and application, complicated operation, high energy consumption, etc., and achieve good photocatalytic purification effect, small material particle size and high crystallinity

Active Publication Date: 2014-04-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many literatures and patent reports about the preparation method of two-phase mixed crystal titanium dioxide, but there are only a few literature reports and no patent reports about the preparation method of three-phase mixed crystal titanium dioxide.
At the same time, due to the large difference in thermal stability among anatase, rutile and brookite, a high-temperature calcination method is usually used to synthesize titanium dioxide materials with a mixed crystal structure. This method is complicated to operate and consumes a lot of energy. Conducive to practical promotion and application

Method used

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  • Preparation method for triphase mixed crystal titanium dioxide materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 4.4 mL of butyl titanate to 50 mL of 10 mol / L sodium hydroxide solution, and continue to stir for 5 h; wash the resulting precipitate with 150 mL of water three times, redisperse it in 40 mL of 0.25 mol / L nitric acid solution, and stir 30 min; the resulting mixture was placed in a 100 mL hydrothermal reaction kettle with a tetrafluoroethylene liner, and hydrothermally reacted at 180 °C for 24 h; the obtained precipitate was washed with water until the supernatant was neutral, and then dried at 50 °C. For details, please refer to figure 1 , figure 1 X-ray diffraction (XRD) pattern of the three-phase mixed crystal titanium dioxide prepared for this example.

Embodiment 2

[0021] Add 4.4 mL of isopropyl titanate to 50 mL of 10 mol / L sodium hydroxide solution, and continue to stir for 5 h; wash the obtained precipitate with 150 mL of water three times, and redisperse it in 40 mL of 0.25 mol / L hydrochloric acid solution. Stir for 30 min; put the obtained mixture in a 100 mL hydrothermal reaction kettle with a PTFE liner, and conduct a hydrothermal reaction at 180 °C for 24 h; wash the obtained precipitate with water until the supernatant is neutral, and dry it at 50 °C to obtain .

Embodiment 3

[0023] Add 4.4 mL of butyl titanate to 100 mL of 8 mol / L potassium hydroxide solution, and continue to stir for 5 h; wash the resulting precipitate with 150 mL of water three times, redisperse it in 40 mL of 0.25 mol / L hydrochloric acid solution, and stir 30 min; the resulting mixture was placed in a 100 mL hydrothermal reaction kettle with a tetrafluoroethylene liner, and hydrothermally reacted at 180 °C for 24 h; the obtained precipitate was washed with water until the supernatant was neutral, and then dried at 50 °C.

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Abstract

The invention discloses a preparation method for triphase mixed crystal titanium dioxide materials. The preparation method comprises the following steps: (1) adding a titanium precursor into an alkali solution according to the volume ratio of 1:(10-25), and stirring constantly for 1-5 h; (2) washing the sediment obtained in step (1) for 2-6 times with water of 100-300 ml, dispersing again in an acid solution of 40-160 ml, and stirring for 10-45 min; (3) placing the compound obtained in step (2) in a hydrothermal reaction kettle of 100-200 ml with a PTEE inner container, and conducting a hydrothermal reaction at 150-200 DEG C for 12-36 h; (4) washing the sediment obtained in step (3) until the supernatant fluid is neutral, and drying to obtain the triphase mixed crystal titanium dioxide material. According to the invention, a one-step reaction method is adopted to prepare the triphase mixed crystal titanium dioxide material with a controllable crystal form proportion; the preparation method has the advantages of being simple and convenient, free of high-temperature calcination and the like.

Description

technical field [0001] The invention belongs to photocatalytic technology, and in particular relates to a preparation method of a three-phase mixed crystal titanium dioxide material. Background technique [0002] Semiconductor photocatalysis technology has been widely used in the field of environmental pollution control. Among many semiconductor catalysts, titanium dioxide is an ideal environment-friendly photocatalyst, which has the advantages of stable chemical properties, non-toxicity, and low cost. Titanium dioxide has a multiphase structure, and exists in nature in three crystal phases: anatase, rutile and brookite. It is generally believed that the photocatalytic activity of the anatase phase is higher than that of the rutile phase. In recent years, studies have found that the two-phase mixed crystal structure (rutile / anatase, anatase / brookite or rutile / brookite) can effectively promote the separation of photogenerated electrons and holes, and improve the photocataly...

Claims

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Application Information

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IPC IPC(8): B01J21/06
Inventor 朱利中陈坤洋杨坤
Owner ZHEJIANG UNIV
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