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Method for preparing bismuth oxide nano powder

A nano-powder and bismuth oxide technology, which is applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve problems such as high energy consumption, unsatisfactory quality, and difficulties in single-phase bismuth oxide nano-powders

Inactive Publication Date: 2006-10-25
SHANGHAI UNIV
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Problems solved by technology

However, the bismuth oxide produced by the chemical precipitation method reported in the literature so far is mostly micron and submicron powders.
Moreover, due to the hydrolysis of bismuth ions to produce a variety of products, it is difficult to prepare pure single-phase bismuth oxide nanopowders by general chemical precipitation methods, and it is difficult to control the uniformity and size of powder particles
As for physical methods such as ball milling, they are not widely used because of their high energy consumption and unsatisfactory quality.

Method used

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Examples

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Embodiment 1

[0016] The steps of the preparation method of the present embodiment bismuth oxide nanopowder are as follows:

[0017] (1), weigh bismuth nitrate according to the required concentration, and prepare metal ion Bi 3+ Aqueous solution with a total concentration of 1mol / L.

[0018] (2), according to alcohol-water weight ratio is 5: 1 configuration alcohol-water solution; In alcohol-water solution, add ammonia water to make pH value reach 12, and add the polyethylene glycol PEG6000 of alcohol-water solution total amount 1wt% as dispersant .

[0019] (3) At room temperature, slowly drop 1 part of bismuth nitrate aqueous solution into 10 parts of alcohol-water solution, and mechanically stir; continue stirring for 2 hours after the titration is completed, and filter after standing for a while to obtain a precipitated substance.

[0020] (4), the above-mentioned precipitated substance is repeatedly cleaned to no nitrate ion with deionized water; then it is put into dehydrated alcoho...

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Abstract

The invention relates to a method for preparing bismuth oxide nano powder by novel chemical liquid phase precipitation, reversely titrating bismuth nitrate into excessive basic alcohol-water solution and obtaining deposit, then washing with deionized water, dispersing and extracting with anhydrous alcohol; then drying and burning and making highly pure and ultrafine bismuth oxide powder. And it has good dispersivity, grain size of 30 nm about, and its crystal phase is a single alpha phase.

Description

technical field [0001] The invention relates to a preparation method of bismuth oxide nanopowder, which belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Bismuth oxide-based materials have excellent optical, electrical, and magnetic properties, and have been widely used in high-tech fields such as electronic ceramics industry and organic synthesis catalysis. Bismuth oxide is also an important raw material for the pharmaceutical industry. Bismuth oxide has four phases of α, β, γ, and δ, and a variety of crystal structures make it have rich properties. The uniqueness of bismuth oxide has attracted people's attention to this material. The stable δ-phase bismuth oxide material is also an important solid electrolyte material. Doping suitable metal oxides in bismuth oxide can obtain a δ-phase solid solution with high ion conductivity and stable structure. When the bismuth oxide crystal grains are as small as nanometers, due to the s...

Claims

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Application Information

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IPC IPC(8): C01G29/00
Inventor 甄强
Owner SHANGHAI UNIV
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