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Method for one-step microwave synthesis of La-Cr co-doped strontium titanate

A technology of co-doping and microwave method, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of industrial application limitations, low photocatalytic activity, poor sample dispersion, etc., and achieve reduced energy consumption and reaction costs, good chemical stability, Ease of mass production

Inactive Publication Date: 2015-03-11
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are certain defects in these two methods. The temperature of the solid phase method is relatively high. Because the high temperature sintering will increase the particle size, the size of the prepared sample is large, resulting in poor dispersion of the sample and low photocatalytic activity.
The general reaction time of the hydrothermal method is long, and the reaction time in existing reports is as long as 72 hours, which limits the industrial application of this method

Method used

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  • Method for one-step microwave synthesis of La-Cr co-doped strontium titanate
  • Method for one-step microwave synthesis of La-Cr co-doped strontium titanate
  • Method for one-step microwave synthesis of La-Cr co-doped strontium titanate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 3.50mmol of strontium hydroxide, 3.50mmol of titanium dioxide (P25) and 43.75mmol of potassium hydroxide into 30mL of deionized water, and stir for 25 minutes at a speed of 600 rpm to obtain a uniformly dispersed emulsion I .

[0028] (2) Add 0.035mmol of lanthanum nitrate and 0.07mmol of chromium nitrate into the emulsion I respectively, stir for 15 minutes under the condition of a rotating speed of 600 rpm, and mix well to obtain solution II.

[0029] (3) Transfer the solution II to a polytetrafluoroethylene-lined microwave reactor, keep the temperature at 150° C. for 3 hours, and then cool naturally to obtain a hydrothermal product.

[0030] (4) Centrifuge the hydrothermal product obtained in step (3), wash it with deionized water for 5 times, and make the pH about 8.

[0031] (5) The centrifuged product was vacuum-dried at 60° C. for 12 hours to obtain La-Cr co-doped strontium titanate nanoparticles.

Embodiment 2

[0033] (1) Add 3.50mmol of strontium hydroxide, 7.0mmol of titanium dioxide (P25) and 43.75mmol of potassium hydroxide into 30mL of deionized water, and stir for 30 minutes at a speed of 600 rpm to obtain a uniformly dispersed emulsion I .

[0034] (2) Add 0.0175mmol of lanthanum nitrate and 0.07mmol of chromium nitrate into the emulsion I respectively, and stir for 15 minutes under the condition of rotating speed of 600 rpm to make it fully mixed to obtain solution II.

[0035] (3) Transfer the solution II to a polytetrafluoroethylene-lined microwave reactor, keep the temperature at 150° C. for 4 hours, and then cool naturally to obtain a hydrothermal product.

[0036] (4) Centrifuge the hydrothermal product obtained in step (3), and wash with deionized water for 5 times, so that the pH is about 8.

[0037] (5) The centrifuged product was vacuum-dried at 70° C. for 10 hours to obtain La-Cr co-doped strontium titanate nanoparticles.

Embodiment 3

[0039] (1) Add 3.50mmol of strontium hydroxide, 7.0mmol of titanium dioxide (P25) and 43.75mmol of potassium hydroxide into 30mL of deionized water, and stir for 30 minutes at a speed of 600 rpm to obtain a uniformly dispersed emulsion I .

[0040] (2) Add 0.07mmol of lanthanum nitrate and 0.07mmol of chromium nitrate into the emulsion I respectively, and stir for 20 minutes under the condition of rotating speed of 600 rpm to make it fully mixed to obtain solution II.

[0041] (3) Transfer the solution II to a polytetrafluoroethylene-lined microwave reactor, keep the temperature at 120° C. for 5 hours, and then cool naturally to obtain a hydrothermal product.

[0042] (4) Centrifuge the hydrothermal product obtained in step (3), wash it with deionized water for 5 times, and make the pH about 8.

[0043] (5) The centrifuged product was vacuum-dried at 80° C. for 6 hours to obtain La-Cr co-doped strontium titanate nanoparticles.

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Abstract

The invention discloses a method for one-step microwave synthesis of La-Cr co-doped strontium titanate nanoparticles. With strontium hydroxide, titanium dioxide P25 and potassium hydroxide as raw materials and with La(NO)3.6H2O and Cr(NO)3.9H2O as dopants, the La-Cr co-doped strontium titanate nanoparticles with uniform morphology are synthesized by a microwave method, the shortcomings of a solid phase method and a hydrothermal method are overcome, and thus the preparation reaction time is greatly shortened, and the sample grain size can be adjusted and controlled.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and photocatalysis, and specifically relates to a method for synthesizing La-Cr co-doped strontium titanate by one-step microwave method. Background technique [0002] Titanate semiconductor materials have high dielectric quality factor, dielectric constant and suitable energy band structure, and have important application value in the field of photocatalytic degradation of organic pollutants and photolysis of water to produce hydrogen. Therefore, it is of great significance to study the synthesis and physical and chemical properties of titanate semiconductor materials. In recent years, people have done a lot of work on the preparation method, performance and application of titanate semiconductor materials, and achieved certain achievements. [0003] Among many titanate semiconductor materials, strontium titanate has attracted increasing attention due to its suitable valence band (VB)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B82Y30/00B82Y40/00
Inventor 唐玉斌蔡凡朋陈芳艳王新刚陈海丰
Owner JIANGSU UNIV OF SCI & TECH
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