Nitrogen oxide nanosheet, preparation method thereof, photocatalyst and photocatalytic antibacterial agent

A photocatalytic antibacterial agent, nitrogen oxide technology, applied in botanical equipment and methods, physical/chemical process catalysts, nitrogen compounds, etc., can solve problems such as affecting activity

Active Publication Date: 2021-12-17
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide a nitrogen oxide nanosheet and its preparation method and application, aiming to solve the existing narrow-band nitrogen oxide preparation existing in nitrogen During the oxidation process, the nitrogen oxide crystals only expose low-activity crystal faces, which seriously affects their activity in photocatalytic water splitting.

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  • Nitrogen oxide nanosheet, preparation method thereof, photocatalyst and photocatalytic antibacterial agent
  • Nitrogen oxide nanosheet, preparation method thereof, photocatalyst and photocatalytic antibacterial agent

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preparation example Construction

[0025] The embodiment of the present application provides a preparation method of nitrogen oxide nanosheets. The preparation method specifically includes the following steps:

[0026] S01: preparing a layered oxide, wherein the layered oxide contains volatile metal elements;

[0027] S02: Exfoliate the layered oxide along the [001] crystal phase direction of the layered oxide to obtain oxide nanosheets;

[0028] S03: Nitriding the oxide nanosheets to obtain nitrogen oxide nanosheets.

[0029] The preparation method of nitrogen oxide nanosheets provided in the examples of the present application is to prepare layered oxides containing volatile metal elements. The volatile metal elements can be volatilized from the surface of layered oxides during the nitriding process, and the remaining elements are heated in ammonia gas. Under the atmosphere, it quickly transforms into nitrogen oxide nanosheets along the [010] crystal phase direction, and retains the original sheet shape, whi...

Embodiment 1

[0049] A preparation method of nitrogen oxide nanosheets (the number of layers is 1-5 layers), comprising the following steps:

[0050] S01:

[0051] A narrow oxynitride nanosheet (the number of layers is 1-5 layers of LaNbON 2 Nano sheet) preparation method, comprises the following steps:

[0052] S01: Preparation of layered oxide LaKNaNbO by NaOH / KOH molten salt method 5 Nitriding precursors.

[0053] Take 5mmol La 2 o 3 and 5 mmol Nb 2 o 5 Grind thoroughly in a mortar to obtain La 2 o 3 , Nb 2 o 5 mixture; then La 2 o 3 , Nb 2 o 5 The mixture was transferred to an alumina crucible and 10g KOH and 5g NaOH were added, then the alumina crucible was placed in a muffle furnace, heated to 873K at a heating rate of 10K / min, kept at 873K for 3 hours and then cooled to 773K, Then it was incubated at 773K for 15 hours and then naturally cooled to room temperature to obtain LaKNaNbO 5 Reaction product; finally, the reaction product was washed 3-5 times with ultrapure w...

Embodiment 2

[0061] A narrow oxynitride nanosheet (the number of layers is 5-50 layers of LaNbON2 Nano sheet) preparation method, comprises the following steps:

[0062] S01: Preparation of layered oxide LaKNaNbO by NaOH / KOH molten salt method 5 Nitriding precursors.

[0063] Take 5mmol La 2 o 3 and 5 mmol Nb 2 o 5 Grind thoroughly in a mortar to obtain La 2 o 3 , Nb 2 o 5 mixture; then La 2 o 3 , Nb 2 o 5 The mixture was transferred to an alumina crucible and 10g KOH and 5g NaOH were added, then the alumina crucible was placed in a muffle furnace, heated to 873K at a heating rate of 10K / min, kept at 873K for 3 hours and then cooled to 773K, Then it was incubated at 773K for 15 hours and then naturally cooled to room temperature to obtain LaKNaNbO 5 Reaction product; Finally, the reaction product was washed 3-5 times with ultrapure water at room temperature and centrifuged to remove residual NaOH and KOH, followed by vacuum drying to obtain the layered oxide LaKNaNbO 5 .

[...

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Abstract

The invention relates to the technical field of photocatalytic materials, and provides a nitrogen oxide nanosheet, a preparation method thereof, a photocatalyst and a photocatalytic antibacterial agent. The preparation method comprises the steps of performing stripping treatment on the layered oxide along the [001] crystal phase direction of the layered oxide to obtain an oxide nanosheet; and carrying out nitriding treatment on the oxide nanosheet to obtain the nitrogen oxide nanosheet. The ultrathin flaky morphology obtained by stripping the layered oxide facilitates rapid movement of photo-generated charges to the surface, the charge separation efficiency is remarkably improved, and the photocatalytic water decomposition activity of the nitrogen oxide nanosheet is further effectively improved; besides, volatile metal elements contained in the oxide nanosheet volatilize from the surfaces of the oxide nanosheet in the nitriding treatment process, other elements are directionally converted into the nitrogen oxide nanosheet in the ammonia gas atmosphere, and the problem that only low-activity crystal faces of traditional nitrogen oxide crystal faces are exposed is solved while the original sheet-shaped morphology is reserved.

Description

technical field [0001] The application belongs to the technical field of photocatalyst materials, and in particular relates to a nitrogen oxide nanosheet and a preparation method thereof, a photocatalyst, and a photocatalytic antibacterial agent. Background technique [0002] At present, the preparation of nitrogen oxides mainly adopts the thermal nitriding method, that is, ammonia gas continues to pass through the oxides for more than 10 hours under the condition of 1173-1373K. However, due to the higher electronegativity of Nb than Ta, a large amount of reduced Nb is easily produced during the thermal nitridation process. 4+ or Nb 3+ These low-valence Nb species can act as electron-hole recombination centers, hindering the transport and reaction of photogenerated charges, thereby seriously affecting their photocatalytic water splitting activity. [0003] Therefore, the existing preparation of narrow-band nitrogen oxides has problems such as that the nitrogen oxide crysta...

Claims

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Application Information

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IPC IPC(8): C01B21/082C01B3/04B82Y30/00B82Y40/00B01J27/24A01N59/00A01P1/00A01P3/00A61L2/23
CPCC01B21/0821B01J27/24C01B3/042A01N59/00B82Y30/00B82Y40/00A61L2/23C01P2002/78C01P2004/20B01J35/23B01J35/39Y02E60/36
Inventor 薛冬峰王鑫王晓明
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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