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A method for preparing yttrium zirconate powder by nitrate-urea combustion method

A technology of yttrium zirconate and combustion method, which is applied in chemical instruments and methods, zirconium compounds, inorganic chemistry, etc., can solve the problems of high reaction temperature, large product size, stoichiometric loss, etc., and promotes low-temperature rapid synthesis. , The effect of less product loss and uniform distribution

Active Publication Date: 2019-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the above methods, the disadvantage of the high-temperature solid-phase sintering method is that the synthesis temperature is high, the size of the generated product is large, the particle size cannot be controlled, and there is an impure phase due to uneven distribution of components, which has a stoichiometric loss; the simple sol-gel method The disadvantage is that the reaction temperature is higher and the reaction time is longer
The advantage of the hydrothermal method is that it overcomes the disadvantages of uneven distribution of components and stoichiometric loss. However, the requirements for equipment are higher and the reaction time is longer.

Method used

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  • A method for preparing yttrium zirconate powder by nitrate-urea combustion method
  • A method for preparing yttrium zirconate powder by nitrate-urea combustion method
  • A method for preparing yttrium zirconate powder by nitrate-urea combustion method

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Experimental program
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Effect test

Embodiment 1

[0029] 1) Weigh the analytically pure Y(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·5H 2 O was placed in a beaker and dissolved in deionized water to obtain Y(NO 3 ) 3 ·6H 2 Solution A and Zr(NO 3 ) 4 ·5H 2 O concentration is 0.025mol / L solution B, solution A and solution B are mixed to obtain Y(NO 3 )3 ·6H 2 O concentration is the mixed solution of 0.0125mol / L, wherein, the molar ratio of Y and Zr in the mixed solution is 1:1;

[0030] 2) Using urea as the combustion agent, add 1 mol / L urea solution into the uniformly stirred mixed solution by adding dropwise, in which the molar ratio of urea:Y=5:1 is maintained, and then slowly add concentrated ammonia water to adjust Its pH=6, and a mixed solution was obtained.

[0031] 3) Stir the mixed solution with a magnetic stirrer at a speed of 350 rpm for 0.5h to obtain a stable transparent sol, put the stable transparent sol into an ultrasonic instrument, control the temperature to 80°C, and the ultrasonic frequency to 40KHZ , t...

Embodiment 2

[0035] 1) Weigh the analytically pure Y(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·5H 2 O was dissolved in a beaker with deionized water respectively to obtain solution A and solution B, and solution A and solution B were mixed to obtain Y (NO 3 ) 3 ·6H 2 O concentration is the mixed solution of 0.2mol / L, wherein, the molar ratio of Y and Zr in the mixed solution is 1:1;

[0036] 2) Using urea as the combustion agent, add 2mol / L urea solution into the uniformly stirred mixed solution by adding dropwise, and keep the molar ratio of urea:Y=6:1, and then slowly add concentrated ammonia water to adjust Its pH ranges to 5 to obtain a mixed liquor.

[0037] 3) Stir the mixed solution with a magnetic stirrer at a speed of 400 rpm for 1 hour to obtain a stable transparent sol, put the stable transparent sol into an ultrasonic instrument, control the temperature at 60°C, and the ultrasonic frequency at 40KHZ, The ultrasonic power was 1500W, and a white gel was obtained after ultrasonic...

Embodiment 3

[0044] 1) Weigh the analytically pure Y(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·5H 2 O was dissolved in a beaker with deionized water respectively to obtain solution A and solution B, and solution A and solution B were mixed to obtain Y (NO 3 ) 3 ·6H 2 O concentration is the mixed solution of 0.1mol / L, wherein, the molar ratio of Y and Zr in the mixed solution is 1:1;

[0045] 2) Using urea as the combustion agent, add 1 mol / L urea solution into the uniformly stirred mixed solution by adding drop by drop, keep the molar ratio of urea:Y=7:1, and then slowly add concentrated ammonia water to adjust In the range of pH=4, a mixed solution is obtained.

[0046] 3) Stir the mixed solution with a magnetic stirrer at a speed of 450 rpm for 1 hour to obtain a stable transparent sol solution, put the stable transparent sol solution into an ultrasonic instrument, control the temperature at 60°C, and the ultrasonic frequency at 40KHZ, The ultrasonic power was 1500W, and a white gel was...

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Abstract

A method for preparing yttrium zirconate by nitrate-urea combustion method comprises the following steps: dissolving Y(NO3)3.6H2O in water to obtain a solution A, dissolving Zr(NO3)4.5H2O in deionized water to obtain a solution B, mixing solution A and solution B to obtain a mixed solution, dropwise adding urea solution into the mixed solution, adjusting pH value to 2-6, stirring at room temperature, performing ultrasonic treatment, heating at high temperature, and performing heat treatment at 500-700 DEG C for 1-3 h to obtain yttrium zirconate powder. The method of the invention has simple and convenient process, does not need special equipment, and is easy to operate, and the preparation cost is low; and the reaction system is mild and controllable, the combustion product has few impurities, the product loss rate is low, and the heat released in urea combustion in a short period of time can promote rapid low-temperature synthesis of the materials. Compared with the high-temperature solid phase method in the prior art, the method of the invention has low energy consumption and is environment-friendly.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a combustion method for preparing yttrium zirconate (Y 2 Zr 2 o 7 ) new method of microcrystals. Background technique [0002] In the past few decades, semiconductor photocatalytic materials for the degradation of sewage, waste gas and organic pollutants have attracted great attention [Yuping Tong, Panpan Xue, et al. Preparation and characterization of Y 2 Zr 2 o 7 Nanocrystals and their photocatalytic properties[J].Materials Science and Engineering:B,2008,150(3):194-198.]. The rare earth zirconates (Ln 2 Zr 2 o 7 , Ln=lanthanides, scandium Sc, yttrium Y) have been found to have good photocatalytic activity, which expands the range of potential materials for researchers to find ideal photocatalytic materials. [0003] Since the element yttrium and another element cerium are two kinds of rare earth elements with large content on the earth, compared with other kinds of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/00
CPCC01G25/00C01P2002/72C01P2004/03
Inventor 曹丽云罗艺佳黄剑锋吴建鹏冯亮亮程娅伊
Owner SHAANXI UNIV OF SCI & TECH
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