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Zinc oxide-based photocatalytic material co-doped with niobium nitrogen and its preparation method and application

A catalytic material and co-doping technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unstable and unobtainable zinc oxide nitrogen doping, and reduce operation Requirements, the effect of simple preparation process

Active Publication Date: 2020-10-09
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

However, most of the existing technical means adopt the method of heat treatment under the atmosphere of nitrogen-containing source (such as nitrogen, ammonia, etc.) to realize the nitrogen doping of the material. For the common wide-bandgap semiconductor zinc oxide, due to its own The complexity of defect chemistry and the particularity of crystal structure lead to the instability of ZnO doping with nitrogen, and the ideal nitrogen doping effect is often not obtained.

Method used

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  • Zinc oxide-based photocatalytic material co-doped with niobium nitrogen and its preparation method and application
  • Zinc oxide-based photocatalytic material co-doped with niobium nitrogen and its preparation method and application
  • Zinc oxide-based photocatalytic material co-doped with niobium nitrogen and its preparation method and application

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preparation example Construction

[0023] see figure 1 , the invention provides a kind of preparation method of the zinc oxide base photocatalytic material of niobium nitrogen co-doping, comprises the following steps:

[0024] S101: Prepare 1-1000mmol / L niobium-zinc alcohol solution and 0.01-0.1mg / mL lye, mix and stir for 30-120 minutes, carry out hydrolysis and precipitation reaction, and obtain a suspension;

[0025] S102: Centrifuge the suspension to collect powder, alternately wash with secondary deionized water and absolute ethanol, and put it into a drying oven to dry at a temperature of 50-60°C;

[0026] S103: Pre-crystallize the dried powder at a temperature of 300-550°C for 0-300 minutes, and then heat it for 30-300 minutes at a temperature of 400-700°C in an ammonia atmosphere to obtain the niobium-nitrogen co- Doped ZnO-based photocatalytic materials.

[0027] Further, in step S101, the niobium-zinc alcohol solution is prepared by dissolving zinc chloride and niobium chloride in the alcohol solutio...

Embodiment 1

[0035] Prepare a niobium-zinc alcohol solution, in which the concentration of zinc ions is 100mmol / L, the concentration of niobium ions is 1mmol / L, and 0.035mg / mL of lye, and the two solutions are mixed and stirred at room temperature for 30min to obtain a suspension;

[0036] The obtained suspension was centrifuged to collect the powder, alternately washed 8 times with secondary deionized water and absolute ethanol, and dried in a drying oven at 60°C for one day;

[0037]The obtained powder was pre-crystallized at 500° C. for 100 minutes, and then kept at 550° C. for 120 minutes in an ammonia atmosphere to obtain the final niobium-nitrogen co-doped zinc oxide-based photocatalytic material.

Embodiment 2

[0039] Prepare a niobium-zinc alcohol solution, in which the concentration of zinc ions is 100mmol / L, the concentration of niobium ions is 2mmol / L, and 0.04mg / mL of lye, and the two solutions are mixed and stirred at room temperature for 30min to obtain a suspension;

[0040] The obtained suspension was centrifuged to collect the powder, alternately washed 8 times with secondary deionized water and absolute ethanol, and dried in a drying oven at 60°C for one day;

[0041] The obtained powder was pre-crystallized at 500° C. for 120 minutes, and then kept at 550° C. for 120 minutes in an ammonia atmosphere to obtain the final niobium-nitrogen co-doped zinc oxide-based photocatalytic material.

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Abstract

The invention provides a preparation method of a niobium-nitrogen codoped zinc oxide-based photocatalytic material. The preparation method comprises the following steps of preparing 1-1000 mmol / L of niobium-zinc alcoholic solution and 0.01-0.1 mg / mL and alkali liquor, stir-mixing the niobium-zinc alcoholic solution and the alkali liquor for 30-120 minutes for hydrolytic precipitation reaction to obtain a suspension; centrifuging the suspension to collect powder, alternately washing the powder through secondary deionized water and absolute ethyl alcohol, and drying the washed powder at 50-60 DEG C in a drying oven; pre-crystallizing the dried powder at 300-550 DEG C for 0-300 minutes, and then heat-preserving the powder in ammonia atmosphere at 400-700 DEG C for 30-300 minutes to obtain theniobium-nitrogen codoped zinc oxide-based photocatalytic material. The preparation method of the niobium-nitrogen codoped zinc oxide-based photocatalytic material is simple in process, greatly reduces the operation requirements during material preparation and is applicable industrial popularization. The invention also provides the niobium-nitrogen codoped zinc oxide-based photocatalytic materialand application of the niobium-nitrogen codoped zinc oxide-based photocatalytic material.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic nanometer materials and environmental protection of water purification, and specifically relates to a zinc oxide-based photocatalytic material co-doped with niobium and nitrogen, a preparation method and application thereof. Background technique [0002] Energy crisis and environmental pollution are two major problems faced by human beings in today's era. Photocatalytic technology can oxidize and mineralize almost any organic molecule into carbon dioxide and inorganic ions because it can effectively use solar energy, and degrade organic pollutants in water. The elimination of microorganisms such as bacteria and viruses in water has received widespread attention. Among the numerous photocatalysts, some n-type semiconductors with wide bandgap such as titanium dioxide, zinc oxide, and tin oxide are widely used in photolysis of water to produce hydrogen, fields such as s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/03B01J37/08C02F1/30C02F101/30
CPCB01J27/24B01J35/004B01J37/033B01J37/082C02F1/30C02F2101/30C02F2305/10
Inventor 李勃高爽
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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