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Preparation method of flower-cluster-shaped bismuth stannate nano-powder

A nano-powder, bismuth stannate technology, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of difficult mass production, high energy consumption of the preparation process, long production cycle, etc., and achieve crystallinity Excellent, cheap and easy to obtain raw materials, short production cycle

Active Publication Date: 2021-02-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of high energy consumption, long production cycle, low yield and difficulty in mass production in the existing preparation process of bismuth stannate powder, the present invention provides a method with good dispersibility, high phase purity and excellent crystallinity. The preparation method of flower-clustered bismuth stannate nanopowder, the preparation raw material of this method is cheap and easy to obtain, the process is simple, the energy consumption is low and the production cycle is short, and it is easy to realize industrial production

Method used

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  • Preparation method of flower-cluster-shaped bismuth stannate nano-powder
  • Preparation method of flower-cluster-shaped bismuth stannate nano-powder
  • Preparation method of flower-cluster-shaped bismuth stannate nano-powder

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Prepare 50ml of 0.025mol / L bismuth sulfate dilute acid solution, the solvent is dilute sulfuric acid, which is recorded as A solution;

[0036] (2) Prepare 50ml 0.025mol / L potassium stannate aqueous solution, denoted as B solution;

[0037] (3) Put solution B in a separatory funnel and add it dropwise to solution A at a constant speed of 2ml / s under magnetic stirring at 600r / min to form a translucent emulsion;

[0038] (4) Add 2g of citric acid gelling agent and 0.2g of polyethylene glycol-2000 dispersant to the translucent emulsion respectively. After fully mixing, add 30% NaOH solution dropwise to the pH of the mixed solution to 8. Continue to stir at room temperature for 30 minutes; age for 3 hours, remove the supernatant, wash with deionized water and alcohol, centrifuge, and separate, repeat 3 times, and then put it in a blast-type drying box, and dry at 80°C for 12 hours. A white drying powder is obtained, that is, a bismuth stannate nano-powder precursor;

...

Embodiment 2

[0041] (1) Prepare 50ml 0.05mol / L bismuth nitrate dilute acid solution, the solvent is dilute nitric acid, which is recorded as A solution;

[0042] (2) Prepare 50ml of 0.05mol / L sodium stannate aqueous solution, denoted as B solution;

[0043] (3) Put solution B in a separatory funnel and add it dropwise to solution A at a constant speed of 2.5ml / s under magnetic stirring at 600r / min to form a translucent emulsion;

[0044] (4) Add 2g of citric acid gelling agent and 0.3g of polyethylene glycol-2000 dispersant to the translucent emulsion respectively. After fully mixing, add NaOH solution dropwise until the pH of the mixed solution reaches 10, and continue to stir at room temperature 30min; aged for 4h, removed the supernatant, washed with deionized water and alcohol, centrifuged and separated, repeated 4 times, and then put it into a blast-type drying box and dried at 80°C for 12h to obtain a white drying powder , the precursor of bismuth stannate nano-powder;

[0045] (5)...

Embodiment 3

[0047] (1) Prepare 50ml of 0.04mol / L bismuth chloride dilute acid solution, the solvent is dilute hydrochloric acid, denoted as A solution;

[0048] (2) Prepare 50ml of 0.04mol / L tin tetrachloride aqueous solution, denoted as B solution;

[0049] (3) Put solution B in a separatory funnel and add it dropwise to solution A at a constant speed of 2.5ml / s under 600r / min magnetic stirring to form a translucent emulsion;

[0050] (4) Add 2.5g of citric acid gelling agent and 0.2g of polyethylene glycol-2000 dispersant to the translucent emulsion. After mixing well, add NaOH solution dropwise until the pH of the mixed solution reaches 12, and continue to store at room temperature. Stir at low temperature for 30 minutes; age for 6 hours, remove the supernatant, wash with deionized water and alcohol, centrifuge, and separate, repeat 5 times, then put it in a blast drying oven, dry at 80°C for 12 hours, and obtain a white drying Powder, namely bismuth stannate nanopowder precursor;

[0...

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Abstract

The invention relates to the technical field of nano-powder preparation, in particular to a preparation method of flower-cluster-shaped bismuth stannate nano-powder, which comprises the following steps: (1) dropwisely adding a Sn source solution into a Bi source solution at a constant speed to obtain a semitransparent emulsion; (2) adding a gelatinizing agent and a dispersing agent into the semitransparent emulsion, conducting full mixing, adjusting the pH value to be alkaline, continuing to conducting stirring and aging at room temperature, removing the supernatant, and conducting washing, centrifuging and drying on the precipitate; and (3) after grinding, carrying out high-temperature vacuum sintering to obtain the flower-cluster-shaped bismuth stannate nano-powder. The flower-cluster-shaped bismuth stannate nano-powder prepared by a coprecipitation method has the advantages of cheap and accessible preparation raw materials, simple technique, low energy consumption and short production period, and can easily implement industrial production.

Description

technical field [0001] The invention relates to the technical field of nano-powder preparation, in particular to a preparation method of a flower cluster-shaped bismuth stannate nano-powder. Background technique [0002] Bismuth stannate (Bi 2 Sn 2 O 7 ) is a novel pyrochlore-structured composite oxide semiconductor material with excellent photocatalytic and gas-sensing properties. At present, bismuth stannate (Bi 2 Sn 2 O 7 ) conventional preparation techniques mainly include hydrothermal method, high temperature solid phase method, etc. [0003] According to literature reports, scholars such as the Chinese Academy of Sciences and the Shanghai Institute of Ceramics have synthesized bismuth stannate nanopowders with spherical and rod-like structures with good photocatalytic properties by hydrothermal method. It can be found that the existing hydrothermal preparation technology for synthesizing bismuth stannate powder involves severe high temperature and high pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00
CPCC01G29/00C01P2002/72C01P2004/03C01P2004/30C01P2006/80
Inventor 郑晓华王纯杨芳儿秦海波张红生
Owner ZHEJIANG UNIV OF TECH
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