Nanofiber-cluster-shaped bismuth vanadate gas-sensitive material and preparation method thereof

Abstract

The invention relates to a nanofiber cluster-shaped bismuth vanadate gas sensitive material and a preparation method thereof, the nanofiber cluster-shaped bismuth vanadate gas sensitive material is composed of a nanofiber-stacked fiber cluster and independently dispersed nanofibers, the diameter of the independently dispersed nanofibers is 5-50 nm, the diameter of the nanofiber-stacked fiber cluster is 10-500 nm, and the nanofiber cluster-shaped bismuth vanadate gas sensitive material contains fiber gap micropores smaller than 2 nm. The fiber clusters formed by stacking the nanofibers and the independently dispersed nanofibers are in lap joint with each other to form macropores of 50-150 nm. The preparation method comprises: preparing a dilute nitric acid solution; respectively dissolving bismuth nitrate pentahydrate and ammonium metavanadate in a dilute nitric acid solution; dropwise adding the ammonium metavanadate mixed solution into the bismuth nitrate mixed solution; adding ammonia water; performing solvothermal reaction; performing centrifugation; pouring absolute ethyl alcohol, and rotating and oscillating; and centrifugally washing. The method does not need roasting, and is low in energy consumption and simple in process. The material is high in sensitivity to ethylene glycol gas, short in response recovery time and low in working temperature.

Description

technical field

[0001] The invention belongs to the technical field of metal oxide semiconductor gas-sensing materials, in particular to a nanofiber cluster-shaped bismuth vanadate gas-sensing material and a preparation method thereof. Background technique

[0002] With the development of social economy, the acceleration of industrialization and urbanization, the problems of population growth, environmental pollution and ecological deterioration are becoming more and more serious. Some organic volatile compounds (VOCs) will be produced in daily production and life, and the increase of VOCs emissions will have adverse effects on the ambient air. Among them, ethylene glycol (EG), which is an important industrial raw material, has great toxicity and will cause great harm to human health. Ethylene glycol is an important organic chemical raw material, mainly used in the production of polyester fibers and antifreeze. With the increase of ethylene glycol production in my country,...

Examples

preparation example Construction

[0047] The preparation method of nanofiber cluster-shaped bismuth vanadate gas-sensing material, the steps are as follows:

[0048] Step 1: Measure a certain amount of concentrated nitric acid and deionized water, and configure a dilute nitric acid solution with a concentration of 1 to 4 mol / L;

[0049] Step 2, take by weighing a certain amount of bismuth nitrate pentahydrate and ammonium metavanadate, the mol ratio of bismuth nitrate pentahydrate and ammonium metavanadate is (1.01~1.2): 1; Bismuth nitrate pentahydrate and ammonium metavanadate are added respectively In a dilute nitric acid solution with a concentration of 1 to 4 mol / L, a mixed solution of bismuth nitrate with a concentration of 0.01 to 0.04 mol / L and a mixed solution of ammonium metavanadate with a concentration of 0.01 to 0.04 mol / L are obtained, and they are stirred at room temperature. Stir evenly at a rate of 400-1000 rad / min to form a colorless clear solution and a pale yellow clear solution;

[0050] S...

Embodiment 1

[0058] The preparation method of nanofiber cluster-shaped bismuth vanadate gas-sensing material, the steps are as follows:

[0059] Step 1: Measure a certain amount of concentrated nitric acid and deionized water, and configure a dilute nitric acid solution with a concentration of 1 mol / L;

[0060] Step 2, take by weighing a certain amount of bismuth nitrate pentahydrate and ammonium metavanadate, the mol ratio of bismuth nitrate pentahydrate and ammonium metavanadate is 1.01:1; Bismuth nitrate pentahydrate and ammonium metavanadate are added respectively and the concentration is 1mol / In L of dilute nitric acid solution, a mixed solution of bismuth nitrate with a concentration of 0.01 mol / L and a mixed solution of ammonium metavanadate with a concentration of 0.01 mol / L were obtained, and the stirring speed was 400 rad / min at room temperature. A colorless clear solution and a pale yellow clear solution were formed;

[0061] Step 3. The ammonium metavanadate mixed solution pr...

Embodiment 2

[0068] The preparation method of nanofiber cluster-shaped bismuth vanadate gas-sensing material, the steps are as follows:

[0069] Step 1, measure a certain amount of concentrated nitric acid and deionized water, and configure a dilute nitric acid solution with a concentration of 2 mol / L;

[0070] Step 2, take by weighing a certain amount of bismuth nitrate pentahydrate and ammonium metavanadate, the mol ratio of bismuth nitrate pentahydrate and ammonium metavanadate is 1.1:1; Bismuth nitrate pentahydrate and ammonium metavanadate are added respectively and the concentration is 2mol / In L of dilute nitric acid solution, a mixed solution of bismuth nitrate with a concentration of 0.02 mol / L and a mixed solution of ammonium metavanadate with a concentration of 0.02 mol / L were obtained, and the stirring speed was 600 rad / min at room temperature. A colorless clear solution and a pale yellow clear solution were formed;

[0071] Step 3. The ammonium metavanadate mixed solution pre...

technical field

[0001] The invention belongs to the technical field of metal oxide semiconductor gas-sensing materials, in particular to a nanofiber cluster-shaped bismuth vanadate gas-sensing material and a preparation method thereof. Background technique

[0002] With the development of social economy, the acceleration of industrialization and urbanization, the problems of population growth, environmental pollution and ecological deterioration are becoming more and more serious. Some organic volatile compounds (VOCs) will be produced in daily production and life, and the increase of VOCs emissions will have adverse effects on the ambient air. Among them, ethylene glycol (EG), which is an important industrial raw material, has great toxicity and will cause great harm to human health. Ethylene glycol is an important organic chemical raw material, mainly used in the production of polyester fibers and antifreeze. With the increase of ethylene glycol production in my country,...

Examples

preparation example Construction

[0047] The preparation method of nanofiber cluster-shaped bismuth vanadate gas-sensing material, the steps are as follows:

[0048] Step 1: Measure a certain amount of concentrated nitric acid and deionized water, and configure a dilute nitric acid solution with a concentration of 1 to 4 mol / L;

[0049] Step 2, take by weighing a certain amount of bismuth nitrate pentahydrate and ammonium metavanadate, the mol ratio of bismuth nitrate pentahydrate and ammonium metavanadate is (1.01~1.2): 1; Bismuth nitrate pentahydrate and ammonium metavanadate are added respectively In a dilute nitric acid solution with a concentration of 1 to 4 mol / L, a mixed solution of bismuth nitrate with a concentration of 0.01 to 0.04 mol / L and a mixed solution of ammonium metavanadate with a concentration of 0.01 to 0.04 mol / L are obtained, and they are stirred at room temperature. Stir evenly at a rate of 400-1000 rad / min to form a colorless clear solution and a pale yellow clear solution;

[0050] S...

Embodiment 1

[0058] The preparation method of nanofiber cluster-shaped bismuth vanadate gas-sensing material, the steps are as follows:

[0059] Step 1: Measure a certain amount of concentrated nitric acid and deionized water, and configure a dilute nitric acid solution with a concentration of 1 mol / L;

[0060] Step 2, take by weighing a certain amount of bismuth nitrate pentahydrate and ammonium metavanadate, the mol ratio of bismuth nitrate pentahydrate and ammonium metavanadate is 1.01:1; Bismuth nitrate pentahydrate and ammonium metavanadate are added respectively and the concentration is 1mol / In L of dilute nitric acid solution, a mixed solution of bismuth nitrate with a concentration of 0.01 mol / L and a mixed solution of ammonium metavanadate with a concentration of 0.01 mol / L were obtained, and the stirring speed was 400 rad / min at room temperature. A colorless clear solution and a pale yellow clear solution were formed;

[0061] Step 3. The ammonium metavanadate mixed solution pr...

Embodiment 2

[0068] The preparation method of nanofiber cluster-shaped bismuth vanadate gas-sensing material, the steps are as follows:

[0069] Step 1, measure a certain amount of concentrated nitric acid and deionized water, and configure a dilute nitric acid solution with a concentration of 2 mol / L;

[0070] Step 2, take by weighing a certain amount of bismuth nitrate pentahydrate and ammonium metavanadate, the mol ratio of bismuth nitrate pentahydrate and ammonium metavanadate is 1.1:1; Bismuth nitrate pentahydrate and ammonium metavanadate are added respectively and the concentration is 2mol / In L of dilute nitric acid solution, a mixed solution of bismuth nitrate with a concentration of 0.02 mol / L and a mixed solution of ammonium metavanadate with a concentration of 0.02 mol / L were obtained, and the stirring speed was 600 rad / min at room temperature. A colorless clear solution and a pale yellow clear solution were formed;

[0071] Step 3. The ammonium metavanadate mixed solution pre...

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