Nitrogen-doped potassium niobate nano photocatalyst and preparation method and application thereof

A nano-photocatalyst, potassium nitrogen niobate technology, applied in the field of photocatalytic degradation of organic pollutants, can solve the problems such as few reports, achieve the effect of cost reduction, cheap and easy to obtain raw materials, simple and quick operation

Inactive Publication Date: 2021-12-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the niobium oxide semiconductors synthesized by these methods only respond to ultraviolet light, and there are few reports on their application under visible light.

Method used

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  • Nitrogen-doped potassium niobate nano photocatalyst and preparation method and application thereof
  • Nitrogen-doped potassium niobate nano photocatalyst and preparation method and application thereof
  • Nitrogen-doped potassium niobate nano photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1KNbO 3 Nanoparticles

[0027] (1) Preparation method

[0028] Weigh Nb 2 o 5 Put 0.53g in a 46mL hydrothermal reaction kettle, then weigh 12g KOH and put it into four reaction kettles, add 10mL deionized water, stir evenly, seal the reaction kettle, put it in an oven, and set the oven temperature rise program to 6°C / min Rise to 200°C and react at 200°C for 12 hours. After the reaction, close the oven and cool down to room temperature naturally. Take out the inner tank of the reaction kettle and centrifuge with deionized water to wash the white powder at the bottom until neutral, then bake at 80°C for 24 hours and take it out. Place in a sample bottle to get KNbO 3 .

[0029] (2) Detection

[0030] figure 1 Be the KNbO prepared under the hydrothermal condition of 30mol / L for the concentration of KOH in embodiment 1 3 The SEM image of figure 1 It can be seen that the shape of the sample is a nano-square with very sharp corners, and the statistical res...

Embodiment 2

[0031] Embodiment 2 Nitrogen-doped potassium niobate nanometer photocatalyst

[0032] (1) Preparation method

[0033] Weigh 0.3g of the white powder collected above and 1.0g of urea respectively, place them in a porcelain crucible, grind carefully with the bottom of a glass test tube, stir and mix evenly, cover the crucible lid, put them into a muffle furnace, and set the temperature of the muffle furnace to rise Program 20°C / min to rise to 425°C, and react at 425°C for 4 hours. After the reaction, close the muffle furnace, cool down to room temperature naturally, take out the sample and store it in a sample bottle to obtain the target nitrogen-doped potassium niobate photonanocatalyst.

[0034] (2) Detection

[0035] figure 2 It is the SEM photo of KNbO3 nano-squares doped with N in Example 2. The doping of N causes a certain change in the shape of the sample, mainly showing that there are many cotton-like substances on the surface of the nano-squares, but the size of the n...

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Abstract

The invention discloses a nitrogen-doped potassium niobate nano photocatalyst and a preparation method and application thereof. The catalyst is prepared through the following steps: 1, weighing Nb2O5 and KOH and putting into a hydrothermal reaction kettle, then adding deionized water, stirring the mixture to be uniform, putting the reaction kettle into a drying oven for a reaction, after the reaction is completed, cooling the reaction kettle to the room temperature and taking out, centrifugally separating and washing white powder at the bottom until the white powder is neutral, and drying to obtain KNbO3 nano powder; and 2) weighing the KNbO3 nano-powder and urea, grinding, stirring and mixing uniformly, putting into a muffle furnace for reaction, and naturally cooling to room temperature after the reaction is finished to obtain the target product nitrogen-doped potassium niobate nano photocatalyst. The catalyst is a nano square block with flocculent attachments, has a side length of 150-450 nm, has visible light response, and can be used for photocatalytic degradation of organic pollutants, especially orange G, pentachlorobiphenyl and bisphenol A, under visible light.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation of organic pollutants, and in particular relates to a nitrogen-doped potassium niobate nanometer photocatalyst and a preparation method and application thereof. Background technique [0002] At present, the treatment technology of refractory organic matter has become a research hotspot in environmental science all over the world, and photocatalytic degradation using sunlight is an effective way to solve this problem. Photocatalytic technology uses clean solar energy as energy, can completely mineralize many organic substances that are difficult to biodegrade, and also has the advantages of fast decomposition rate, no secondary pollution, and relatively low price. It is becoming a new high-efficiency energy-saving environmental pollution control technology On the one hand, high hopes are placed on it. The most widely studied and applied photocatalyst is TiO 2 , but the bandgap ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/20B01J35/00C02F1/30C02F101/30C02F101/34C02F101/36
CPCB01J23/20B01J27/24B01J35/004C02F1/30C02F2305/10C02F2101/308C02F2101/345C02F2101/36
Inventor 倪秀峰张清宇刘泽源戚朱琳董梦婷马梦莹
Owner ZHEJIANG UNIV
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