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a nanobi 2 ti 2 o 7 Powder preparation method

A powder and nano technology, applied in the field of preparation of nano Bi2Ti2O7 powder, can solve the problems of long time required for hydrothermal synthesis, easy to produce agglomeration, low yield, etc., and achieve improved photocatalytic performance, regular particle morphology, fully developed effect

Active Publication Date: 2017-03-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrothermal synthesis takes a long time and the yield is low
The chemical solution decomposition method and the sol-gel method belong to the chemical solution method, and the process is familiar, but the chemical solution decomposition method is to directly dry the precursor solution into a powder, and then calcined. There is no sol and gel formation process in the middle, so the whole The uniformity of the system is not as high as that of the sol-gel system, and it is easy to agglomerate

Method used

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  • a nanobi <sub>2</sub> ti <sub>2</sub> o <sub>7</sub> Powder preparation method
  • a nanobi <sub>2</sub> ti <sub>2</sub> o <sub>7</sub> Powder preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] step one:

[0025] Weigh 0.005mol of Bi(NO 3 ) 3 ·5H 2 O was placed in a dry beaker, 10ml of acetic anhydride was added to it, and it was allowed to stand for 4 hours to make Bi(NO 3 ) 3 ·5H 2 O is completely dissolved, and the solution concentration is 0.5mol / L; this solution is recorded as A;

[0026] Step two:

[0027] Weigh 0.005 mol of tetrabutyl titanate and dissolve it in 17 ml of ethylene glycol to a solution concentration of 0.3 mol / L, and add glacial acetic acid dropwise to the solution to make the pH of the solution 5; this solution is denoted as B;

[0028] Step three:

[0029] Add solution A to solution B, mix and stir for 5 hours to obtain a precursor solution;

[0030] Step four:

[0031] Put the precursor solution in step 3 into an oven, set the oven temperature to 80°C, get a white gel after 5 hours, and get a dry precursor powder after continuing to dry for 24 hours;

[0032] Step five:

[0033] Calcinate the precursor powder in step 4, rais...

Embodiment 2

[0035] step one:

[0036] Weigh 0.005mol of Bi(NO 3 ) 3 ·5H 2 O was placed in a dry beaker, 5ml of acetic anhydride was added to it, and it was allowed to stand for 4 hours to make Bi(NO 3 ) 3 ·5H 2 O is completely dissolved, and the solution concentration is 1.0mol / L; this solution is recorded as A;

[0037] Step two:

[0038] Weigh 0.005 mol of tetrabutyl titanate and dissolve it in 50 ml of ethylene glycol to a solution concentration of 0.1 mol / L, and add glacial acetic acid dropwise to the solution to make the pH of the solution 5; this solution is denoted as B;

[0039] Step three:

[0040] Add solution A to solution B, mix and stir for 8 hours to obtain a precursor solution;

[0041] Step four:

[0042] Put the precursor solution in step 3 into an oven, set the oven temperature to 80°C, get a white gel after 5 hours, and get a dry precursor powder after continuing to dry for 24 hours;

[0043] Step five:

[0044] Calcinate the precursor powder in step 4, raise...

Embodiment 3

[0046] step one:

[0047] Weigh 0.004mol of Bi(NO 3 ) 3 ·5H 2 O was placed in a dry beaker, 5ml of acetic anhydride was added to it, and it was allowed to stand for 4 hours to make Bi(NO 3 ) 3 ·5H 2 O is completely dissolved, and the solution concentration is 0.8mol / L; this solution is recorded as A;

[0048] Step two:

[0049]Weigh 0.004mol of tetrabutyl titanate and dissolve it in 15ml of ethylene glycol to a solution concentration of 0.27mol / L, and add glacial acetic acid dropwise to the solution to make the pH of the solution 5; this solution is denoted as B;

[0050] Step three:

[0051] Add solution A to solution B, mix and stir for 6 hours to obtain a precursor solution;

[0052] Step four:

[0053] Put the precursor solution in step 3 into an oven, set the oven temperature to 80°C, get a white gel after 5 hours, and get a dry precursor powder after continuing to dry for 24 hours;

[0054] Step five:

[0055] Calcinate the precursor powder in step 4, raise th...

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Abstract

The invention provides a preparation method for nanometer Bi2Ti2O7 powder. The preparation method comprises the following steps: completely dissolving Bi(NO3)3.5H2O and acetic anhydride so as to obtain a solution A; then dissolving tetrabutyl titanate in glycol and adding glacial acetic acid so as to obtain a solution B; mixing the solution A with the solution B and drying the obtained mixture in a baking oven; and carrying out calcining, insulation and cooling so as to obtain the Bi2Ti2O7 powder. The prepared Bi2Ti2O7 powder has improved photocatalytic performance and the characteristics of completely developed powder crystal phase, high purity, regular particle morphology, a size of less than 100 nm, uniformness and fineness.

Description

technical field [0001] The invention belongs to functional material Bi 2 Ti 2 o 7 The technical field of preparation of powder, in particular to a kind of nano Bi 2 Ti 2 o 7 Powder preparation method. Background technique [0002] Bi 2 o 3 and TiO 2 Composite can form composite oxides with various crystal phase structures: Bi 4 Ti 3 o 12 、 Bi 2 Ti 2 o 7 、 Bi 2 Ti 4 o 11 、 Bi 12 TiO 20 and Bi 20 TiO 32 etc., commonly known as bismuth titanate compounds. Among them Bi 2 Ti 2 o 7 The lattice parameter of the crystal is a=b=c=2.068nm, which belongs to the cubic crystal system, so Bi 2 Ti 2 o 7 The film has no piezoelectricity and ferroelectricity; Bi 2 Ti 2 o 7 With a high dielectric constant, it is suitable as a storage medium in dynamic random access memory (DRAM), which reduces the area of ​​the memory unit, thereby realizing ultra-large-scale integration. In addition, due to the unique crystal structure and electronic structure of the bismuth t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00B82Y30/00
Inventor 夏傲谈国强
Owner SHAANXI UNIV OF SCI & TECH
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