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Method for preparing mixed crystal type titanium dioxide nano-powder and product thereof

A technology of titanium dioxide and nanopowder, which is applied in the field of photocatalytic materials, can solve the problems of difficulty in precise control of the amount or time of addition, difficulty in adapting to large-scale batch production requirements, low product quality stability, etc., and achieve excellent photocatalytic degradation ability , Small grain size, fast effect

Active Publication Date: 2013-03-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These preparation methods are produced by controlling the calcination temperature or adding impurity ions to simultaneously contain anatase and rutile TiO 2 However, the defects of these existing preparation methods are: (1) the process is complex, it is difficult to precisely control the process conditions, and the quality stability of the obtained product is not high; (2) the calcination process requires Specialized calcination equipment, and the reaction takes a long time, the generation efficiency is not high, and it is difficult to adapt to the production needs of large-scale batches; (3) Due to the need to add impurity ions to control the reaction process, it is difficult to accurately control the amount or time of addition, and High cost and easy to introduce other unavoidable impurities that affect the quality of the final product

Method used

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  • Method for preparing mixed crystal type titanium dioxide nano-powder and product thereof
  • Method for preparing mixed crystal type titanium dioxide nano-powder and product thereof
  • Method for preparing mixed crystal type titanium dioxide nano-powder and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036]Weigh 10.20 g of tetrabutyl titanate, add an appropriate amount of deionized water to completely hydrolyze tetrabutyl titanate to obtain a white precipitate, separate the white precipitate and wash it with deionized water, and then add 30 mL of deionized After soaking in water, slowly add about 20mL of concentrated nitric acid dropwise to it while stirring, fully stir to dissolve the precipitate completely, and obtain a clear and transparent solution; then add urea and appropriate Deionized water (in this example, 0.81g of urea and an appropriate amount of deionized water were specifically added), and after magnetic stirring, a 100ml clear and transparent mixed solution was formed; the above mixed solution was placed in a high-temperature furnace at 350°C, and the solution After evaporation, boiling and foaming, a violent combustion reaction occurs, and a fluffy powder is obtained after the combustion reaction is completed. The powder was ground with a mortar to obtain 1...

Embodiment 2

[0039] Weigh 8.53g of titanium isopropoxide, add an appropriate amount of deionized water to completely hydrolyze titanium isopropoxide to obtain a white precipitate, separate the white precipitate and wash it with deionized water, and then add 30mL of deionized water to the precipitate , while stirring, slowly add about 20mL of concentrated nitric acid dropwise to it, stir fully to dissolve the precipitate completely, and obtain a clear and transparent solution; then add urea and appropriate deionized water (in this example, 4.50g of urea and an appropriate amount of deionized water were specifically added), and after magnetic stirring, a 100ml clear and transparent mixed solution was formed; the above mixed solution was placed in a high-temperature furnace at 500°C, and the solution was evaporated , After boiling and foaming, a violent combustion reaction occurs, and fluffy powder is obtained after the combustion reaction is completed. The powder was ground with a mortar to ...

Embodiment 3

[0042] Weigh 10.2 g of tetrabutyl titanate, add an appropriate amount of deionized water to completely hydrolyze tetrabutyl titanate to obtain a white precipitate, separate the white precipitate and wash it with deionized water, and then add 30 mL of deionized After soaking in water, slowly add about 20mL of concentrated nitric acid dropwise to it while stirring, stir fully to dissolve the precipitate completely, and obtain a clear and transparent solution; then add glycine and Appropriate amount of deionized water (in this example, 2.50 g of glycine and appropriate amount of deionized water were specifically added), and after magnetic stirring, 100 ml of clear and transparent mixed solution was formed; the above mixed solution was placed in a high-temperature furnace at 600 ° C, and the solution After evaporation, boiling and foaming, a violent combustion reaction occurs, and a fluffy powder is obtained after the combustion reaction is completed. The powder was ground with a ...

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Abstract

The invention discloses a method for preparing mixed crystal type titanium dioxide nano-powder containing anatase and rutile. The method comprises: (a) hydrolyzing and precipitating tetrabutyl titanate or titanium isopropoxide, and mixing the formed precipitate and nitric acid to form a titanium salt solution; (b) adding urea into the prepared titanium salt solution to form a mixed solution, with a mole ratio of the urea and the titanium ion in the titanium salt solution being 0.4 to 40; and (c) performing a self-propagating combustion for the mixed solution in a high-temperature furnace of 300 to 600 DEG C, so as to obtain a mixed crystal type titanium dioxide nano-powder simultaneously containing anatase and rutile. The invention further discloses corresponding preparation product. According to the invention, the nanoscale titanium dioxide powder can be obtained with simple process and low cost; and the prepared product simultaneously contains the anatase and the rutile, is small in grain size, uniform in granularity and excellent in photocatalytic degradation.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and more specifically relates to a method for preparing mixed crystal titanium dioxide nanopowder including anatase type and rutile type and a product thereof. Background technique [0002] TiO 2 Due to the advantages of strong oxidation ability, complete degradation, no secondary pollution, good chemical stability, and low cost, it has become the most widely studied photocatalyst in the past forty years, and has been widely used in photolysis of water, carbon and nitrogen. In the field of photocatalysis such as fixing and degrading organic matter. TiO 2 The photocatalytic activity is closely related to its crystal form, crystallinity, morphology, and particle size. TiO 2 Including three crystal structures of anatase phase, rutile phase and brookite phase, research shows that TiO in anatase phase and rutile phase 2 Both have photocatalytic activity, and TiO containing two ph...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82Y30/00
Inventor 薛丽红严有为张五星杨淼
Owner HUAZHONG UNIV OF SCI & TECH
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