Dendritic Crystal Form Bismuth Tungstate Preparation Scheme

Bismuth tungstate is a very important functional material in tungstate. It has been widely used in many fields, such as visible-light photocatalyst, water decomposition, hydrogen production, environmental purification and new energy development. It is well known that the properties of nanomaterials depend on the morphology and size of nanocrystals, so the preparation of bismuth tungstate nanocrystals with special morphology is of great significance in theoretical research and practical application.

Dendritic bismuth tungstate exhibits peculiar properties due to its large specific surface area. Meanwhile, dendritic ordered dendritic structure also creates favorable conditions for the preparation and application of nanodevices. The preparation process of the tungstate is as follows:

1)Dissolving potassium carbonate in deionized water to form potassium carbonate aqueous solution, adjusting the concentration of potassium carbonate in solution to 0.3 mol/L;

2)Bismuth nitrate was dissolved in deionized water to form Bismuth nitrate aqueous solution. The concentration of Bismuth nitrate in the solution was adjusted to 0.2 mol/L.

3) Bismuth nitrate aqueous solution prepared by step 1) and step 2) was mixed to obtain bismuth carbonate precipitation and potassium nitrate solution, in which the molar ratio of potassium carbonate and bismuth nitrate was 1.5:1.

4)Sodium tungstate was dissolved in deionized water to form sodium tungstate aqueous solution. The concentration of sodium tungstate in the solution was adjusted to 0.1 mol/L.

5)Sodium dodecylbenzenesulfonate was dissolved in deionized water to form an aqueous solution of sodium dodecylbenzenesulfonate, and the concentration of sodium dodecylbenzenesulfonate in the solution was adjusted to 3%.

6)Sodium tungstate solution prepared in step 4 and sodium dodecylbenzenesulfonate solution prepared in step 5 were mixed to obtain mixed solution of sodium tungstate and sodium dodecylbenzenesulfonate, and stirred for 40 minutes. The volume ratio of sodium tungstate solution to sodium dodecylbenzenesulfonate solution was 1:1.

7)Sodium tungstate and sodium dodecylbenzenesulfonate prepared by step 3 precipitation and potassium nitrate solution were mixed with step 6 (the molar ratio of sodium tungstate and bismuth carbonate was 1:2). Then the container containing the mixture was put into ultrasonic wave for ultrasonic treatment. The ultrasonic power was 500 W and the ultrasonic time was 80 minutes.

8)The mixture after ultrasonic treatment was added to the reactor inner gallbladder, and the volume of the reactant in the reactor inner gallbladder was adjusted by distilled water to reach 70% of the volume of the reactor inner gallbladder.

9)Step 8) the reactor liner with reaction material is placed in the reactor, sealed, kept at 150 ℃ for 24 hours for hydrothermal treatment, then the reactor is cooled to room temperature naturally. After unloading the reactor, the reaction product is washed repeatedly with distilled water. After filtering and drying, bismuth tungstate dendrites are obtained. The diameter of bismuth bismuth tungstate is about 10-30nm, and its length is about 1-2um.

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