Graphene nitrogen carbide quantum dot modified ZnS micrometer composite material as well as preparation method and application thereof

A technology of graphene nitrogen and composite materials, which is applied in the field of ZnS micro-composite materials modified by graphene nitrogen carbon quantum dots and its preparation, can solve the problems of complicated preparation methods and easy agglomeration of quantum dots.

Active Publication Date: 2018-07-06
NORTHEAST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is in order to solve existing g-C 3 N 4 Quantum dots are easy to agglomerate and the preparation method is complicated, and a ZnS micro-composite material modified by graphene nitrogen carbide quantum dots and its preparation method and application are provided

Method used

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  • Graphene nitrogen carbide quantum dot modified ZnS micrometer composite material as well as preparation method and application thereof
  • Graphene nitrogen carbide quantum dot modified ZnS micrometer composite material as well as preparation method and application thereof
  • Graphene nitrogen carbide quantum dot modified ZnS micrometer composite material as well as preparation method and application thereof

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preparation example Construction

[0031] The present invention at first provides a kind of preparation method of the ZnS micro-composite material of graphene carbonized nitrogen quantum dot modification, and this method comprises:

[0032] Step 1: Preparation of ZnS(en) 0.5 Nanosheets, specifically: adding zinc salt and thiourea into ethylenediamine, stirring, the stirring time is preferably 30 minutes, and then hydrothermally reacting at 180-200°C for 10-24 hours, the reaction temperature is preferably 180°C, the reaction time is preferably 18h, after cooling, washing and drying, ZnS(en) can be obtained 0.5 Nanosheets; the zinc salt is preferably zinc chloride, zinc nitrate or zinc acetate; the mass ratio of the zinc salt to thiourea is preferably 272.6:304; the washing is preferably the reactant with ethanol and water Wash each for 2-3 times, the drying temperature is preferably 60-80°C, and the drying time is preferably 10-12h;

[0033] Step 2: Add the amino compound into the porcelain boat, put it in a t...

Embodiment 1

[0042] Example 1g-C 3 N 4 Preparation of QDs

[0043] Add 100 mg of melamine into the porcelain boat, put it in a tube furnace, heat at 550 ° C for 4 hours under nitrogen atmosphere, and the heating rate is 2.5 ° C per minute to obtain the bulk phase g-C 3 N 4 Yellow powder, mix 100mg g-C 3 N 4 The powder was dissolved in 50mL deionized water and stirred for 60min, then transferred to a 100mL reactor and reacted at 200°C for 6h to obtain a light yellow g-C 3 N 4 QDs transparent solution.

[0044] figure 1 g-C prepared for Example 1 3 N 4 Transmission (a), high-resolution photo (b), size distribution (c) and absorption and fluorescence curves (d) of QDs; from figure 1 It can be seen that g-C 3 N 4 QDs have good dispersion, and the crystal lattice is obvious in high-resolution photos, indicating good crystallinity, with an average particle diameter of 5.6nm, blue light emission, absorption and fluorescence, and bulk g-C 3 N 4 Compared with the obvious blue shift, i...

Embodiment 2

[0046] 1. Preparation of ZnS(en) 0.5

[0047] First 272.6mg ZnCl 2 and 304mg of thiourea were added to 60mL of ethylenediamine, stirred for 30min, hydrothermally reacted at 180°C for 18h, cooled to room temperature, washed with ethanol and water for 2-3 times, and dried at 60°C for 12h.

[0048] 2. Preparation of bulk g-C 3 N 4

[0049] Add 100 mg of melamine into the porcelain boat, put it in a tube furnace, heat at 550 ° C for 4 hours under nitrogen atmosphere, and the heating rate is 2.5 ° C per minute to obtain the bulk phase g-C 3 N 4 yellow powder.

[0050] 3. Synthesis of ZCN-0.5

[0051] Take the above ZnS(en) 0.5 Nanosheets and g-C 3 N 4 Powder, where ZnS(en) 0.5 Nanosheets and g-C 3 N 4 The molar ratio of the powder is 1.0:0.5, mixed and stirred for 60 minutes, heated in a reactor at 200°C for 6 hours, then transferred to a dialysis bag for dialysis for 24 hours, and the resulting product was freeze-dried to obtain ZCN-0.5.

[0052] Photocatalytic hydro...

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Abstract

The invention provides a graphene nitrogen carbide quantum dot modified ZnS micrometer composite material as well as a preparation method and application thereof and belongs to the technical field ofsemiconductor composites. The method comprises the following steps: preparing ZnS(en)0.5 nanosheets; adding amino compounds into a porcelain boat, and raising the temperature and reacting in a tube furnace so as to obtain bulk phase g-C3N4 powder; finally, mixing and stirring the ZnS(en)0.5 nanosheets and the g-C3N4 powder, and carrying out a hydrothermal reaction in a reactor, thereby obtaining the graphene nitrogen carbide quantum dot modified ZnS micrometer composite material. The invention further provides application of the graphene nitrogen carbide quantum dot modified ZnS micrometer composite material serving as a photocatalyst. The photocatalyst can reach hydrogen production activity of 5600u mol h-1g-1 under visible light and has excellent photocatalytic stability, the hydrogen production activity is 140 times that of the ZnS under the same condition, and after four cycles, the catalytic effect is not obviously decreased.

Description

technical field [0001] The invention belongs to the technical field of semiconductor composite materials, and in particular relates to a ZnS micro-composite material modified by graphene carbonized nitrogen quantum dots and a preparation method and application thereof. Background technique [0002] Graphene carbide nitrogen (g-C 3 N 4 ) has a wide range of applications in the field of photocatalysis due to its advantages of low toxicity, low consumption, no metal, high stability and abundant raw materials. Compared with other morphologies, g-C 3 N 4 Quantum dots (QDs) have many advantages. For example, good hydrophilicity, many active sites, quantum size effect, etc. But existing g-C 3 N 4 The preparation method of quantum dots is complex, and a single g-C 3 N 4 Quantum dots are prone to agglomeration. [0003] To prevent their agglomeration, quantum dots can be compounded with a three-dimensional semiconductor. This can not only improve the dispersion of quantum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/10C01B3/04
CPCB01J27/24B01J35/004B01J35/1004B01J37/10C01B3/042C01B2203/1076C01B2203/1088Y02E60/36
Inventor 孙海珠王立晶
Owner NORTHEAST NORMAL UNIVERSITY
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