Method for preparing bismuth vanadate ultrafine powder through gel combustion method and bismuth vanadate powder prepared through method

Abstract

The invention relates to the technical field of inorganic matter powder preparation, and discloses a method for preparing bismuth vanadate ultrafine powder through a gel combustion method and bismuth vanadate powder prepared through the method. The method comprises the following steps: (1) forming gel: dissolving bismuth nitrate, vanadyl nitrate and citric acid in absolute ethyl alcohol and deionized water, stirring and mixing, and heating and evaporating the obtained mixed solution to obtain transparent gel; (2) combustion reaction: heating the transparent gel obtained in the step (1) to enable the transparent gel to spontaneously ignite so as to obtain loose orange red precursor powder; and (3) calcining: calcining the precursor powder obtained in the step (2) to obtain bright yellow bismuth vanadate powder. The particle size of the bismuth vanadate powder prepared by the method is superfine (the average particle size is 1t; and agglomeration does not occur, so that the method has wider practicability.

Description

technical field

[0001] The invention relates to the technical field of inorganic powder preparation, in particular to a method for preparing bismuth vanadate superfine powder by a gel combustion method and the bismuth vanadate powder prepared by the method. Background technique

[0002] Bismuth vanadate pigment has the advantages of non-toxicity and high color saturation, and has gradually become a substitute for chrome yellow and cadmium yellow pigments. At the same time, BiVO 4 As a non-toxic, harmless, highly active and stable photocatalyst, it can not only absorb visible light to decompose water to produce oxygen, but also degrade organic matter and waste water, etc., which has extremely important application value. Bismuth vanadate has three crystal structures: monoclinic scheelite, tetragonal scheelite and tetragonal zircon, among which monoclinic scheelite has a narrow band gap (EV=2.34eV) and exhibits better photocatalytic ability. Because of its special structure,...

Examples

Embodiment approach

[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.

technical field

[0001] The invention relates to the technical field of inorganic powder preparation, in particular to a method for preparing bismuth vanadate superfine powder by a gel combustion method and the bismuth vanadate powder prepared by the method. Background technique

[0002] Bismuth vanadate pigment has the advantages of non-toxicity and high color saturation, and has gradually become a substitute for chrome yellow and cadmium yellow pigments. At the same time, BiVO 4 As a non-toxic, harmless, highly active and stable photocatalyst, it can not only absorb visible light to decompose water to produce oxygen, but also degrade organic matter and waste water, etc., which has extremely important application value. Bismuth vanadate has three crystal structures: monoclinic scheelite, tetragonal scheelite and tetragonal zircon, among which monoclinic scheelite has a narrow band gap (EV=2.34eV) and exhibits better photocatalytic ability. Because of its special structure,...

Examples

Embodiment approach

[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.