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Preparation method and application of N-CDs@delta-MnO2 composite nanomaterial

A nanocomposite material, n-cds technology, applied in the field of preparation of N-CDs@δ-MnO2 nanocomposite materials, can solve the problems of low operation safety, complicated preparation process, long preparation time, etc., to achieve safety Good, simple and easy to operate, improve the effect of adsorption and degradation capacity

Active Publication Date: 2018-10-19
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current carbon dot composite materials are complicated to prepare, take a long time to prepare, and require an open flame for heating during preparation, so the operation safety is not high and there is pollution.

Method used

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  • Preparation method and application of N-CDs@delta-MnO2 composite nanomaterial
  • Preparation method and application of N-CDs@delta-MnO2 composite nanomaterial
  • Preparation method and application of N-CDs@delta-MnO2 composite nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of carbon quantum dots (N-CDs):

[0041] (1.1) Weigh 5.000g of ammonium citrate and 1.000g of sodium dihydrogen phosphate, dissolve them in 10ml of distilled water, and ultrasonically dissolve them completely for 5-10min;

[0042] (1.2) Microwave heating for 2-3min to evaporate the water, cool to a safe temperature of 25-30°C, take out the solid, dissolve it with a mixed solution of ethanol and water, sonicate for 5-10min, centrifuge, sonicate again for 5-10min, centrifuge, repeat 3 times Remove large insoluble particles for the first time;

[0043] (1.3) Take out the supernatant, add 10g of 732 strong-acid styrene cation exchange resin, let stand for 5min, then filter with suction, and spin-evaporate the filtrate at 70°C until the solution is thick, pour it into a watch glass, and dry it at 80°C for 4h, Grinding to obtain the product N-CDs.

[0044] It is measured that the particle size of the prepared carbon quantum dots is between 3nm and 8nm.

[0045]...

Embodiment 2

[0047] Synthesis of N-CDs@δ-MnO 2 Nanocomposites:

[0048] (2.1) Accurately weigh 0.15 g of the N-CDs prepared in Example 1, and dissolve them in 20 ml of distilled water with 0.45 g of potassium permanganate, and stir magnetically for 10 min;

[0049] (2.2) At the same time, take 1ml of concentrated hydrochloric acid and dissolve it in 20ml of water, add it dropwise to the potassium permanganate solution after dilution, and continue stirring for 20min;

[0050] (2.3) Put the solution obtained in step (2.2) into a microwave reactor, set the time to 10min, and the temperature to 100°C. After the reaction, cool to a safe temperature of 25-30°C, take it out, and suction filter to obtain yellow The brown solid was washed three times with ethanol and water, and dried at 60°C for 4 hours to obtain the product N-CDs@δ-MnO 2 nanocomposites.

[0051] For comparison, δ-MnO 2 It is also prepared by the same method as the above-mentioned composite material, the difference is that N-CD...

Embodiment 3

[0053] For the N-CDs and N-CDs@δ-MnO prepared in Examples 1 and 2 2 Nanocomposites and δ-MnO 2 Characterization and data analysis were performed.

[0054] figure 2 For the prepared N-CDs@δ-MnO 2 Composite model diagram of nanocomposites. It can be seen that when N-CDs and δ-MnO 2 When composited, the composite N-CDs@δ-MnO 2 More dispersed, larger specific surface area.

[0055] image 3 For the prepared N-CDs@δ-MnO 2 XRD patterns of nanocomposites. From the XRD spectrum of N-CDs in the figure, it can be seen that there is a broad diffraction peak around 2θ=20°, which is similar to the typical diffraction pattern of carbon dots, which means that N-CDs have an amorphous carbon structure, confirming that formation of carbon dots.

[0056] From the figure δ-MnO 2 It can be seen from the XRD spectrum that the four crystal plane diffraction peaks located at 2θ=12.340°, 2θ=24.799°, 2θ=37.371°, and 2θ=66.859° correspond to the diffraction peaks in the PDF#52-0556 card numb...

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Abstract

The invention discloses a preparation method and application of an N-CDs@delta-MnO2 composite nanomaterial. According to the preparation method, carbon quantum dots are prepared according to a microwave hydrothermal assisted method first and then the carbon quantum dots and potassium permanganate are compounded to obtain the composite nanomaterial. During preparation, used raw materials are easy to obtain, low in cost, non-toxic and harmless; compared with the conventional preparation method, the adopted microwave hydrothermal assisted method has the advantages of simple operation and easy implementation, and only 10 minutes is needed from the beginning of the preparation to the obtainment of a finished product; according to the preparation method, the safety is higher, no contaminant is produced, heating is uniform, the heat efficiency is high, and the reaction speed is directly increased; through the N-CDs-decorated delta-MnO2, the delta-MnO2 is easier to disperse in an organic dye,so that a phenomenon that the delta-MnO2 is easy to aggregate is eliminated; the composite N-CDs@delta-MnO2 has a relatively large BET specific surface area and a relatively large pore size and can provide more abundant surface active sites during adsorption of the organic dye, so that the methyl orange adsorbing degradation capability of the delta-MnO2 is effectively improved; particularly, the obtained N-CDs@delta-MnO2 composite material can effectively degrade methylene blue, which is unachievable in the prior art.

Description

technical field [0001] The invention relates to a kind of N-CDs@δ-MnO 2 A preparation method and application of a nanocomposite material belong to the field of nanocomposite materials. Background technique [0002] Carbon quantum dots (referred to as carbon dots, N-CDs) are a new type of fluorescent carbon nanomaterials, which not only inherit the excellent photoelectric properties of traditional quantum dots, but also have the advantages of low toxicity, environmental friendliness and good biocompatibility. . Carbon dots can be combined with organic matter, metal oxides, polymer materials and many other substances to form a new type of carbon dot composite material. Under the encapsulation and modification of carbon dots, this type of composite material has more excellent performance and stimulates greater applications. potential. However, most of the current carbon dot composite materials have complicated preparation process and long preparation time, and an open flame ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/34C02F101/38
CPCB01J20/06B01J20/205C02F1/281C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 田林王娇娇堵锡华李昭宋明庄文昌李靖
Owner XUZHOU UNIV OF TECH
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