Method for preparing bismuth vanadate ultrafine powder through gel combustion method and bismuth vanadate powder prepared through method
A technology of ultra-fine powder and bismuth vanadate, applied in chemical instruments and methods, vanadium compounds, nanotechnology for materials and surface science, etc., can solve the problem of ultra-fine particle size of bismuth vanadate powder and controllable product quality Poor properties, easy agglomeration of bismuth vanadate powder products, etc., to achieve the effects of wide practicability, low cost, and high crystallinity
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[0024] According to a preferred embodiment of the present invention, the method for preparing bismuth vanadate ultrafine powder by the gel combustion method comprises:
[0025] (1) Form a gel: press n Bi / n V =1:1 Weigh a certain amount of bismuth nitrate, vanadyl nitrate, and citric acid and dissolve them in absolute ethanol and deionized water, stir to make them evenly mixed, wherein the absolute ethanol and deionized water are mixed in a volume ratio of 1:1, Under magnetic stirring, evaporate continuously in a water bath at 60-90°C to obtain a transparent gel;
[0026] (2) Combustion reaction: Place the transparent gel prepared in step (1) in an oven at 200°C, and spontaneous combustion will occur after a few minutes to obtain a loose orange-red precursor powder;
[0027] (3) Calcining: Calcining the precursor powder obtained in step (2) at a temperature of 400-450° C. for 0.5-2 hours to obtain bright yellow bismuth vanadate ultrafine powder.
[0028] The present invent...
Embodiment 1
[0032] This embodiment is used to illustrate the process of preparing bismuth vanadate powder according to the gel combustion method of the present invention.
[0033] according to n Bi / n V =1:1 Weigh 7.9g of bismuth nitrate, 2.9g of vanadyl nitrate, and 10g of citric acid and dissolve them in 100ml of absolute ethanol and 100ml of deionized water, stir to make them evenly mixed, and continuously evaporate in a 60°C water bath under magnetic stirring. A clear gel was obtained.
[0034] The transparent gel was placed in an oven at 200°C, and spontaneous combustion occurred after a few minutes to obtain a loose orange-red precursor powder.
[0035] The precursor powder was calcined at 400° C. for 2 hours to obtain a bright yellow bismuth vanadate powder with an average particle size of <100 nm. The bismuth vanadate powder was fully dispersed without agglomeration.
Embodiment 2
[0037] This embodiment is used to illustrate the process of preparing bismuth vanadate powder according to the gel combustion method of the present invention.
[0038] according to n Bi / n V =1:1 Weigh 23.7g of bismuth nitrate, 8.7g of vanadyl nitrate, and 14g of citric acid and dissolve them in 100ml of absolute ethanol and 100ml of deionized water, stir to make them evenly mixed, and continuously evaporate in a water bath at 90°C under magnetic stirring. A clear gel was obtained.
[0039] The transparent gel was placed in an oven at 200°C, and spontaneous combustion occurred after a few minutes to obtain a loose orange-red precursor powder.
[0040] The precursor powder was calcined at 450° C. for 1 h to obtain bright yellow bismuth vanadate powder with an average particle size of <100 nm. The bismuth vanadate powder was fully dispersed without agglomeration.
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