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A method for preparing quaternary sulfide quantum dot-based heterojunction high-efficiency photocatalysts

A photocatalyst and heterojunction technology, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low photocatalytic degradation efficiency and low specific surface area, and achieve simple process and dispersion. Good property and complete crystallization effect

Active Publication Date: 2018-10-09
JIANGSU UNIV
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Problems solved by technology

[0002] AgIn 5 S 8 -ZnS nanocrystals are Ⅰ-Ⅲ-Ⅵ 2 The direct bandgap ternary sulfide semiconductor, with nanometer size and visible light response, not only possesses the excellent performance of quantum dots, but also is expected to replace Cd-based quantum dots in various fields due to its advantages of low toxicity and environmental protection; its strong The quantum confinement effect makes it have size-tunable optical properties, and the large specific surface area provides more active sites. The nanostructure can reduce the distance for carriers to diffuse to the surface of the catalyst, and effectively improve the migration rate of photogenerated carriers. , which is more conducive to the realization of efficient photocatalytic decomposition of organic matter; currently, Wenjuan Zhang et al. (Journal of Solid State Chemistry 183 (2010) 2466–2474.) have studied the preparation of AgIn by microwave method 5 S 8 Powder and verify the effect of degrading methyl orange under visible light, the size of the material is above the micron level, the specific surface area is low, and the photocatalytic degradation efficiency is low
Jiangluqi Song et al. (Inorg.Chem.2015,54,1627-1633.) studied the synthesis of Zn-doped AgIn by hydrothermal method 5 S 8 Changes in the optical properties of quantum dots at different times and temperatures, different concentrations of L-cysteine ​​and zinc acetate content, and finally prepared AgIn 5 S 8 / ZnS core-shell structure and research on biological applications; JianhuaHan et al. (ACS Appl. Mater. Interfaces 2014, 6, 17119-17125.) successfully prepared AgInS 2 Application of modified ZnO nanorods to construct composite systems in all-solid-state hybrid solar cells; Kan Li et al. (ACS Catal.2013,3,170-177.) studied AgIn 5 S 8 / TiO 2 Heterojunction nanocomposite with strong visible-light-responsive photocatalytic activity, however, constructing AgIn grown from an optimized interfacial structure 5 S 8 -ZnS / MoS 2 The application of heterojunction composite photocatalysts has not

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  • A method for preparing quaternary sulfide quantum dot-based heterojunction high-efficiency photocatalysts
  • A method for preparing quaternary sulfide quantum dot-based heterojunction high-efficiency photocatalysts
  • A method for preparing quaternary sulfide quantum dot-based heterojunction high-efficiency photocatalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 AgIn 5 S 8 -ZnS / MoS 2 Preparation of Heterojunction Composite Photocatalyst

[0016] 300mg AgIn 5 S 8 -ZnS nanocrystals were added to 35mL aqueous solution containing ammonium molybdate tetrahydrate and thiourea respectively, magnetically stirred, and the mass ratio of the complex was controlled to be 1%, 5%, 10%, 15%, 30%, and the The hydrothermal reaction was carried out for 8 hours. After the reaction, the obtained product was washed with deionized water / ethanol, filtered, and dried in a constant temperature drying oven at 60°C.

Embodiment 2

[0017] Example 2 AgIn 5 S 8 -ZnS / MoS 2 Characterization and Analysis of Heterojunction Composite Photocatalysts

[0018] Such as figure 1 As shown, it can be seen from the figure that although with the MoS 2 The increase in the amount is still mainly AgIn 5 S 8 -The peak of ZnS nanocrystals does not appear in MoS 2 peak.

[0019] Such as figure 2 As shown, it can be seen from the figure that there is a fluorescence peak when the recombination amount is low, and as the MoS 2 The amount of increase, MoS 2 The Raman characteristic peaks gradually increased, indicating that AgIn was successfully prepared 5 S 8 -ZnS / MoS 2 Heterojunction composite photocatalysts.

[0020] Such as image 3 As shown, it can be seen from the figure that AgIn 5 S 8 -ZnS nanocrystals are only a few nanometers, with MoS 2 The amount of increase, MoS 2 Gradually grow into flakes by aggregation.

[0021] Such as Figure 4 As shown in the figure, it can be clearly seen that the AgIn 5 S...

Embodiment 3

[0022] Example 3 AgIn 5 S 8 -ZnS / MoS 2 Visible light catalytic activity experiments of heterojunction composite photocatalysts

[0023] (1) Prepare a rhodamine B solution with a concentration of 10 mg / L, and place the prepared solution in a dark place.

[0024] (2) Weigh AgIn 5 S 8 -ZnS / MoS 2 Put 10mg of heterojunction composite photocatalyst into the photocatalytic reactor respectively, add 100mL of the target degradation solution prepared in step (1), and stir magnetically for 60 minutes. After the composite photocatalyst is uniformly dispersed, turn on the water source and light source to carry out photocatalysis Degradation experiment.

[0025] (3) Draw up the photocatalytic degradation solution in the reactor every 2 minutes, and use it for the measurement of the ultraviolet-visible absorbance after centrifugation.

[0026] (4) by Figure 4 It can be seen that the prepared nano-heterojunction composite photocatalyst has excellent visible light catalytic activity, es...

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Abstract

The invention relates to I-III-VI group 2 sulfide and particularly relates to an AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst prepared by utilizing a simple and rapid hydrothermal method. The AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst can be used for degrading a rhodamine B dye under visible light. The AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst is prepared by mixing and stirring AgIn5S8-ZnS nano crystals, ammonium molybdate tetrahydrate and thiourea, carrying out a hydrothermal reaction for 8 hours at 200 DEG C, and filtering, washing and drying after the reaction is finished, wherein the mass ratio of the MoS2 to the AgIn5S8-ZnS nano crystals is 1%-30%, and the optimal mass ratio of the photocatalytic performance is 5%. An experiment of degrading rhodamine B (RhB) under the visible light shows that the prepared composite photocatalyst has good photocatalytic activity.

Description

technical field [0001] The present invention relates to Ⅰ-Ⅲ-Ⅵ 2 group of sulfides, especially the preparation of AgIn by simple and rapid hydrothermal method 5 S 8 -ZnS / MoS 2 A heterojunction composite photocatalyst that can be used to degrade Rhodamine B dye under visible light. Background technique [0002] AgIn 5 S 8 -ZnS nanocrystals are Ⅰ-Ⅲ-Ⅵ 2 The direct bandgap ternary sulfide semiconductor, with nanometer size and visible light response, not only possesses the excellent performance of quantum dots, but also is expected to replace Cd-based quantum dots in various fields due to its advantages of low toxicity and environmental protection; its strong The quantum confinement effect makes it have size-tunable optical properties, and the large specific surface area provides more active sites. The nanostructure can reduce the distance for carriers to diffuse to the surface of the catalyst, and effectively improve the migration rate of photogenerated carriers. , which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051
CPCB01J27/051B01J35/004B01J35/023
Inventor 毛宝东宫关施伟东王勃谭丽丽
Owner JIANGSU UNIV
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