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Oxygen-doped nitrogen carbide-precious metal composite catalyst, and preparation method and application thereof

A carbonized nitrogen and oxygen doping technology, which is applied in the preparation of amino compounds, organic compounds, amino hydroxyl compounds, etc., to achieve the effects of inhibiting recombination, improving absorption, and improving photocatalytic efficiency

Inactive Publication Date: 2016-12-21
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on carbon-doped nitrogen composite photocatalysts is mainly concentrated in the fields of photochemical hydrogen production and organic dye degradation, while the development of catalysts for the reduction of nitroaromatic compounds is still blank.

Method used

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  • Oxygen-doped nitrogen carbide-precious metal composite catalyst, and preparation method and application thereof
  • Oxygen-doped nitrogen carbide-precious metal composite catalyst, and preparation method and application thereof
  • Oxygen-doped nitrogen carbide-precious metal composite catalyst, and preparation method and application thereof

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Effect test

Embodiment 1

[0038] A preparation method of oxygen-doped nitrogen carbide-noble metal composite photocatalyst, comprising the following steps:

[0039](1) Synthesis of carbonized nitrogen and preparation of suspension: Weigh 10 grams of melamine and place it in a muffle furnace, calcinate at 600° C. for 5 hours, cool to room temperature, and obtain yellow carbonized nitrogen solid powder after sufficient grinding. Then take 200 mg of nitrogen carbide solid powder and ultrasonically disperse it in 200 milliliters of methanol solvent to obtain a 1 mg / ml nitrogen carbide suspension for use;

[0040] (2) Synthesis of oxygen-doped carbonized nitrogen and preparation of the suspension: take 100 ml of the suspension of the above-mentioned carbonized nitrogen and put it into a reaction kettle, add 200 ml of hydrogen peroxide with a mass fraction of 20% and stir thoroughly, then heat the mixture under 120° C. React for 6 hours, cool naturally to room temperature, and centrifuge at high speed, wash ...

Embodiment 2

[0045] A preparation method of oxygen-doped nitrogen carbide-noble metal composite photocatalyst, comprising the following steps:

[0046] (1) Synthesis of carbonized nitrogen and preparation of suspension: Weigh 15 grams of dipolycyanamide and place it in a muffle furnace, calcinate at 650°C for 8 hours, cool to room temperature, and obtain yellow carbonized nitrogen after thorough grinding Solid powder, then take 100 mg of nitrogen carbide solid powder and ultrasonically disperse it in 200 ml of ethanol solvent to obtain a 0.5 mg / ml nitrogen carbide suspension for use;

[0047] (2) Synthesis of oxygen-doped carbonized nitrogen and preparation of the suspension: take 100 ml of the suspension of the above-mentioned carbonized nitrogen and put it into a reaction kettle, add 80 ml of hydrogen peroxide with a mass fraction of 30% and stir thoroughly, then heat the mixture under 180° C. React for 4 hours, cool naturally to room temperature, and centrifuge at high speed, wash the p...

Embodiment 3

[0052] A preparation method of oxygen-doped nitrogen carbide-noble metal composite photocatalyst, comprising the following steps:

[0053] (1) Synthesis of carbonized nitrogen and preparation of suspension: Weigh 20 grams of urea and place it in a muffle furnace, calcinate at 550° C. for 8 hours, cool to room temperature, and obtain yellow carbonized nitrogen solid powder after sufficient grinding. Then take 300 mg of nitrogen carbide solid powder and ultrasonically disperse it in 100 milliliters of n-propanol solvent to obtain a 3 mg / ml nitrogen carbide suspension for use;

[0054] (2) Synthesis of oxygen-doped carbonized nitrogen and preparation of the suspension: take 50 ml of the suspension of the above-mentioned carbonized nitrogen and put it into a reaction kettle, add 100 ml of hydrogen peroxide with a mass fraction of 15% and stir thoroughly, then heat the mixture under 160° C. React for 8 hours, naturally cool to room temperature, high-speed centrifugation, wash the p...

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Abstract

The invention provides an oxygen-doped nitrogen carbide-precious metal composite catalyst, and a preparation method and an application thereof. Hydrogen peroxide is used to prepare oxygen-doped nitrogen carbide, and precious metal nano-particles are uniformly dispersed on the surface of the oxygen-doped nitrogen carbide, so very good contact surface and very good loading effect are realized; and the prepared catalyst has a good catalysis effect on nitro aromatic compounds. The visible light responding composite catalyst is formed through compounding the oxygen-doped nitrogen carbide with precious metals. The above compound can improve the absorption range of visible lights, accelerate the electron transfer rate and inhibit photoproduced electron and hole compounding, greatly improves the photocatalytic activity of the oxygen-doped nitrogen carbide, and makes the practical application of the composite catalyst to organic catalysis, and degradation and industrialization of organic pollutants in environment be possible.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and in particular relates to an oxygen-doped nitrogen carbide-noble metal composite photocatalyst, a preparation method and an application. Background technique [0002] Since Liu and Cohen (Science, 1989, 245, 841–842) of the University of California theoretically proposed covalent crystals of nitrogen carbide in 1989, carbon nitrogen compounds have attracted the attention of scientists from various countries because of their excellent optical and mechanical properties. Among them, the graphite-like phase carbon nitride is the most stable phase at room temperature, and has properties such as non-toxicity and visible light response (semiconductor band gap 2.7eV), which make it have a broad application prospect in the field of catalysis. Graphite nitrogen carbide has the outstanding advantages of high photocatalytic activity, good stability, cheap raw materials, and especially no meta...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07C213/02C07C215/76C07C209/36C07C211/51C07C211/46C07C211/52C07C217/84C02F1/30C02F101/38
CPCC02F1/30C07C209/36C07C213/02B01J27/24C02F2305/10C02F2101/38B01J35/394B01J35/39C07C215/76C07C211/51C07C211/46C07C217/84C07C211/52
Inventor 吴孔林刘媛明江姚心宇刘坤
Owner ANHUI NORMAL UNIV
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