Method for inhibiting titanium dioxide phase change

A technology of titanium dioxide and phase transformation, applied in the field of inhibiting phase transformation of titanium dioxide, to achieve the effects of inhibiting phase transformation of titanium dioxide, simple operation and lowering temperature

Inactive Publication Date: 2015-05-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods depend on the melting point and valence state of the doping eleme

Method used

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  • Method for inhibiting titanium dioxide phase change
  • Method for inhibiting titanium dioxide phase change
  • Method for inhibiting titanium dioxide phase change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to the volume ratio of the precursor tetrabutyl titanate and absolute ethanol as 1:2, mix the precursor tetrabutyl titanate and absolute ethanol as liquid A;

[0027] (2) Press HNO 3 (mass percentage concentration is 65%), the volume ratio of deionized water and absolute ethanol is 1:3:17 and HNO 3 , deionized water, and absolute ethanol are mixed as liquid B;

[0028] (3) In a magnetic stirrer, slowly drop liquid B into liquid A, the pH value is 5, and then continue to stir for 1 hour;

[0029] (4) The sol was aged at room temperature for 24 hours, and then dried in a drying oven at 70°C for 96 hours;

[0030] (5) Take out the xerogel and grind it in an agate mortar;

[0031] (6) Calcinate the powder obtained in step (6) at 400°C, 450°C, 550°C, and 650°C for 30 minutes, and then cool with the furnace to obtain pure titanium dioxide powder.

[0032] Such as figure 2 As shown in Table 1, 88.4 wt% of the pure titanium dioxide powder prepared by the pre...

Embodiment 2

[0034] (1) According to the volume ratio of the precursor tetrabutyl titanate and absolute ethanol as 1:3, mix the precursor tetrabutyl titanate and absolute ethanol as liquid A;

[0035] (2) Press HNO 3 (mass percentage concentration is 66%), the volume ratio of deionized water and absolute ethanol is 1:4:18 and HNO 3 , deionized water, and absolute ethanol are mixed as liquid B;

[0036] (3) Add an appropriate amount of Ce(NO 3 ) 3 9H 2 O is dissolved in B liquid;

[0037](4) In a magnetic stirrer, slowly drop liquid B into liquid A and the pH value is 4, then continue to stir for 1 hour;

[0038] (5) The sol was aged at room temperature for 48 hours, and then dried in a drying oven at 80°C for 72 hours;

[0039] (6) Take out the dry gel and grind it in an agate mortar;

[0040] (7) The powder obtained in step (6) was calcined at 550°C, 700°C, 750°C, and 850°C for 30 minutes respectively, and then cooled in the furnace to obtain cerium-doped titanium dioxide powder. ...

Embodiment 3

[0043] (1) According to the volume ratio of the precursor tetrabutyl titanate and absolute ethanol as 1:4, mix the precursor tetrabutyl titanate and absolute ethanol as liquid A;

[0044] (2) Press HNO 3 (mass percentage concentration is 67%), the volume ratio of deionized water and absolute ethanol is 1:5:19 and HNO 3 , deionized water, and absolute ethanol are mixed as liquid B;

[0045] (3) Add appropriate amount of La 2 o 3 Soluble in liquid B;

[0046] (4) In a magnetic stirrer, slowly drop liquid B into liquid A and the pH value is 3, then continue to stir for 1 hour;

[0047] (5) The sol was aged at room temperature for 72 hours, and then dried in a drying oven at 100°C for 24 hours;

[0048] (6) Take out the dry gel and grind it in an agate mortar;

[0049] (7) The powder obtained in step (6) was calcined at 550°C, 650°C, 750°C, and 850°C for 30 minutes respectively, and then cooled in the furnace to obtain lanthanum-doped titanium dioxide powder.

[0050] Such ...

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Abstract

The invention discloses a method for inhibiting titanium dioxide phase change and belongs to the technical field of functional materials. The method comprises the following steps: mixing a precursor tetrabutyl titanate and absolute ethyl alcohol to obtain a solution A; mixing HNO3, de-ionized water, absolute ethyl alcohol and a dopant according to a certain ratio to obtain a solution B; in a magnetic stirrer, slowly dripping the solution B into the solution A; continually stirring for 1 hour; standing a sol at a room temperature and ageing; then putting the sol into a drying box to be dried; taking out dry gel and grinding in an agate mortar; uniformly calcining the obtained powder in a muffle furnace; and cooling along the furnace to obtain titanium dioxide powder. According to the method, the temperature of converting the titanium dioxide powder from anatase to rutile is improved. By virtue of the method, the titanium dioxide phase change temperature can be effectively reduced, and the constraints of factors including the smelting point of doped element oxide, the valence state of the doped element and the like are avoided; and a second phase is easy to separate out only if the radius of doped ions is more than Ti<4+>, namely the titanium dioxide phase change can be inhibited.

Description

technical field [0001] The invention relates to a method for inhibiting the phase transition of titanium dioxide, which belongs to the technical field of functional materials. Background technique [0002] TiO 2 There are three crystal structures: rutile, anatase and brookite, the brookite and anatase phases are metastable and are TiO 2 The low-temperature phase; the rutile phase is a thermodynamically stable state and is the TiO 2 The high-temperature phase, the transformation temperature of anatase phase and brookite phase to rutile phase is generally 500~600 °C. The phase transition from anatase to rutile is an irreversible phase transition from a metastable state to a stable state. There is no specific phase transition temperature, and usually there is a wide range of phase transition temperatures. The increase of temperature is an essential condition to promote the transformation of anatase to rutile. When the phase transition temperature is reached, the (100) plane ...

Claims

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Application Information

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IPC IPC(8): B01J23/10
Inventor 甘国友荣雪荃严继康康昆勇杜景红赵文超王志敏张家敏刘意春
Owner KUNMING UNIV OF SCI & TECH
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