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Method for preparing nano bismuth oxide by using liquid phase precipitation method

A technology of nano-bismuth oxide and liquid phase precipitation, which is applied in the field of nano-materials, can solve the problems of long reaction cycle and high energy consumption, and achieve the effects of good shape, low preparation cost and easy control of operating conditions

Active Publication Date: 2015-07-01
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing precipitation technologies are basically hydrothermal synthesis methods, with long reaction cycles and high energy consumption

Method used

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  • Method for preparing nano bismuth oxide by using liquid phase precipitation method
  • Method for preparing nano bismuth oxide by using liquid phase precipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 14g NaOH in a beaker, add 175mL deionized water and stir to dissolve, then add 1.5g sodium lignosulfonate, and magnetically stir to dissolve evenly. Heat in a water bath until the solution temperature reaches 80°C; then add 25mL of 0.2M Bi(III) dropwise to control the formation of drops but not lines. After the solution was reacted in a constant temperature water bath for 1 hour, it was filtered and washed while it was hot, baked in a constant temperature oven at 60°C for 24 hours, and then calcined in a muffle furnace at 500°C for 3 hours. The XRD pattern of the sample is as follows figure 1 a. Scanning electron microscope picture as figure 2 .

Embodiment 2

[0025] Take 14g NaOH in a beaker, add 175mL deionized water and stir to dissolve, then add 1.0g sodium lignosulfonate, and magnetically stir to dissolve evenly. Heat in a water bath until the solution temperature reaches 80°C; then add 25mL of 0.2M Bi(III) dropwise to control the formation of drops but not lines. After the solution was reacted in a constant temperature water bath for 1 hour, it was filtered and washed while it was hot, baked in a constant temperature oven at 60°C for 22 hours, and then calcined in a muffle furnace at 500°C for 3 hours. The XRD pattern of the sample is as follows figure 1 b.

Embodiment 3

[0027] Take 14g NaOH in a beaker, add 175mL deionized water and stir to dissolve, then add 0.5g sodium lignosulfonate, and magnetically stir to dissolve evenly. Heat in a water bath until the solution temperature reaches 75°C; then add 25 mL of 0.2M Bi(III) dropwise to control the formation of drops but not lines. After the solution was reacted in a constant temperature water bath for 1 hour, it was filtered and washed while it was hot, baked in a constant temperature oven at 50°C for 20 hours, and calcined in a muffle furnace at 400°C for 3 hours. The XRD pattern of the sample is as follows figure 1 c.

[0028] figure 1 Among them, a is the XRD spectrum of the sample in Example 1, b in the figure is the XRD spectrum of the sample in Example 2, and c in the figure is the XRD spectrum of the sample in Example 3. figure 1 Among them, the sharper the peak shape, the better the crystallinity. Curve c has the best crystallinity, which shows that the lower the concentration of s...

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Abstract

The invention belongs to the field of nano materials, and discloses a method for preparing nano bismuth oxide by using a liquid phase precipitation method in the presence of lignosulfonate serving as a surfactant. According to the technical scheme of the method, lignosulfonate is used as a surfactant and bismuth nitrate and sodium hydroxide are used as raw materials; the concentration of sodium lignosulfonate is adjusted to 2.5-7.5 g / L, and then nano bismuth oxide is prepared by using a liquid phase precipitation method. In the process of precipitation, the addition of different amounts of surfactants can achieve a steric hindrance effect, so that the direct contact between particles is reduced, the surface tension is lowered, and the surface energy is reduced, thereby lowering the aggregation degree of a dispersion system, caused by the action of a hydrogen bond or VDW (Van der Waals' force), keeping the dispersion system stable realtively, and effectively controlling the size and morphology of nanoparticles. The method for preparing nano bismuth oxide by using a liquid phase precipitation method disclosed by the invention is low in cost and simple to operate, and prepared products are uniform in particle distribution, high in particle properties, good in particle size dispersity and good in morphology; therefore the method can be easily industrialized.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a method for preparing nano-bismuth oxide by a precipitation method, in particular to a method for preparing nano-bismuth oxide by using lignosulfonate as a surfactant. Background technique [0002] Nano Bi 2 o 3 It is an important functional material, which has a variety of crystal forms and physical and chemical properties, and is widely used. Bismuth oxide is a light yellow powder, which turns orange when heated, and turns reddish brown when heated, and has five allomorphic crystals: α, β, γ, δ, ε-Bi 2 o 3 , which are the most studied: α, β, δ three crystal forms. Bi 2 o 3 It melts at 860°C and has a boiling point of 1890°C. It is insoluble in alkali, but soluble in acid to form bismuth salt, which is easily destroyed by C and CH. 4 reduction. Bismuth oxide is mainly used in the preparation of inorganic pigments, chemical reagents, inorganic synthesis, organic catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B82Y30/00
Inventor 郝臣沈毓儒王雷杜木丹张怀良王晓红杨瑞段亚伟
Owner HUAWEI TEHCHNOLOGIES CO LTD
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