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Nitrogen-doped carbon quantum dot/metal organic framework material MOF-5 photocatalyst as well as preparation method and application thereof

A metal-organic framework, MOF-5 technology, applied in the field of photocatalyst preparation, can solve problems such as poor stability, fast electron-hole recombination, and low conductivity

Active Publication Date: 2021-05-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most MOFs materials can only show good photocatalytic performance under certain conditions, and there are problems such as low electrical conductivity, poor stability, and fast electron-hole recombination, which limit the potential of MOFs as photocatalysts.

Method used

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  • Nitrogen-doped carbon quantum dot/metal organic framework material MOF-5 photocatalyst as well as preparation method and application thereof
  • Nitrogen-doped carbon quantum dot/metal organic framework material MOF-5 photocatalyst as well as preparation method and application thereof
  • Nitrogen-doped carbon quantum dot/metal organic framework material MOF-5 photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of nitrogen-doped carbon quantum dot / metal organic framework material MOF-5 photocatalyst (N-CQD / MOF-5), comprising the following steps:

[0039] 1) Coconut shell treatment: remove the coconut meat from the waste coconut shell, dry it at 80°C, beat it into small pieces, and crush it to about 200 mesh with a pulverizer, put it in a sample bag to dry for later use;

[0040] 2) Weigh 1.0g of the processed coconut shell powder, dissolve it in 50ml of pure water, stir evenly, add 0.2 urea, and continue stirring until the urea is completely dissolved;

[0041] 3) Transfer the above solution to a polytetrafluoroethylene-lined reactor, react at 180°C for 18 hours, and after cooling to room temperature, take out the solution in the reactor, filter until the solution is clear, and perform dialysis with a 500 molecular weight dialysis bag for three days , change the water every 3 times, and freeze-dry to obtain solid nitrogen-doped carbon quantum dots;

[004...

Embodiment 2

[0045] A preparation method of nitrogen-doped carbon quantum dot / metal organic framework material MOF-5 photocatalyst (N-CQD / MOF-5), comprising the following steps:

[0046] 1) Coconut shell treatment: Remove the coconut meat from the waste coconut shell, dry it at 100°C, beat it into small pieces, and crush it to about 200 mesh with a pulverizer, put it in a sample bag to dry for later use;

[0047] 2) Weigh 1.0g of the processed coconut shell powder, dissolve it in 60ml of pure water, stir evenly, add 0.4 urea, and continue stirring until the urea is completely dissolved;

[0048] 3) Transfer the above solution to a polytetrafluoroethylene-lined reaction kettle, react at 180°C for 16 hours, and after cooling to room temperature, take out the solution in the reaction kettle, filter until the solution is clear, and perform dialysis with a 500 molecular weight dialysis bag for three days , change the water every 5 hours, and freeze-dry to obtain solid nitrogen-doped carbon quan...

Embodiment 3

[0052] 1) Coconut shell treatment: Remove the coconut meat from the waste coconut shell, dry it at 100°C, beat it into small pieces, and crush it to about 200 mesh with a pulverizer, put it in a sample bag to dry for later use;

[0053] 2) Weigh 1.0g of processed coconut shell powder, dissolve it in 60ml of pure water, stir evenly, add 0.6g of urea, and continue stirring until the urea is completely dissolved;

[0054] 3) Transfer the above solution to a polytetrafluoroethylene-lined reactor, react at 150°C for 14 hours, cool to room temperature, take out the solution in the reactor, filter until the solution is clear, and perform dialysis with a 500 molecular weight dialysis bag for three days , change the water every 5 hours, and freeze-dry to obtain solid nitrogen-doped carbon quantum dots;

[0055] 4) Weigh 0.8g of zinc nitrate hexahydrate, dissolve it in about 60ml of N'N-dimethylformamide (DMF), stir until completely dissolved, add 0.003g of solid nitrogen-doped carbon q...

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Abstract

The invention discloses a nitrogen-doped carbon quantum dot / metal organic framework material MOF-5 photocatalyst as well as a preparation method and application thereof, and relates to the field of photocatalyst preparation. A natural resource coconut shell is used as a raw material, nitrogen-doped carbon quantum dots are prepared by a hydrothermal method, and the nitrogen-doped carbon quantum dots are introduced when a metal organic framework material MOF-5 is prepared by an in-situ synthesis method. During photocatalysis, the nitrogen-doped carbon quantum dot / metal organic framework material MOF-5 photocatalyst improves the conductivity, the stability and the photocatalytic performance of the metal organic framework material MOF-5 by utilizing the high charge transfer capability and the molecular oxygen activation capability of the nitrogen-doped carbon quantum dots (N-CQD). The method is short in technological process, raw materials are low in price and easy to obtain, the method is a very ideal preparation method of the photocatalyst nitrogen-doped carbon quantum dot / metal organic framework material MOF-5, and the nitrogen-doped carbon quantum dot / metal organic framework material MOF-5 photocatalyst prepared through the method has very good photocatalytic performance on hexavalent chromium and can be widely applied to treatment of chromium-containing wastewater.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, in particular to a nitrogen-doped carbon quantum dot / metal organic framework material (MOF-5) photocatalyst and a preparation method and application thereof. Background technique [0002] Tap water used in daily life often contains a small amount of chromium, which mainly comes from industrial wastewater such as metallurgy, refractory materials, chemicals, electroplating, and tanning. Chromium appears in two valence forms of hexavalent and trivalent in water. The toxicity of hexavalent chromium is relatively strong, about 100 times that of trivalent chromium. It mainly exists in the form of chromate, which is harmful to most organisms. Toxic, classified as a carcinogen and mutagen. [0003] The reduction of Cr(VI) in water by semiconductor photocatalysts has obvious advantages, such as low cost, environmental protection, high efficiency, flexibility, feasibility, and direct use of unlimi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J27/24B01J37/10C02F1/30C02F101/22
CPCB01J31/1691B01J31/1625B01J27/24B01J37/10C02F1/30C02F2101/22C02F2305/10B01J2231/62B01J2531/26B01J35/39Y02W10/37
Inventor 强涛涛秦向涛
Owner SHAANXI UNIV OF SCI & TECH
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