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Method for preparing CdS/MoS2 composite hollow-block photocatalyst

A photocatalyst and block technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., to achieve the effect of complete crystallization and good dispersion

Inactive Publication Date: 2017-02-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, building a high-performance hollow square CdS / MoS with a uniform structure 2 There are no reports on heterojunction composite photocatalysts

Method used

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  • Method for preparing CdS/MoS2 composite hollow-block photocatalyst
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  • Method for preparing CdS/MoS2 composite hollow-block photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1CdS / MoS 2 Preparation of Composite Photocatalyst

[0015] Choose 300mg cadmium carbonate, sodium molybdate and 500mg thiourea, the addition amount of sodium molybdate is 1:0:4, 1:0.15:4, 1:0.3:4, 1:0.6:4 according to the ratio of the amount of substances respectively , 1:1.2:4, 1:1.4:4 were added to obtain 6 groups of samples respectively dissolved in 35ml deionized water, magnetically stirred, and hydrothermally reacted at 220 degrees Celsius for 24 hours. After the reaction was completed, the obtained products were successively deionized Wash with water and ethanol, filter, and dry in a constant temperature drying oven at 60°C.

Embodiment 2

[0016] Example 2CdS / MoS 2 Characterization and Analysis of Heterojunction Composite Photocatalysts

[0017] Such as figure 1 As shown, it can be seen from the figure that there are CdS and MoS 2 There are no other impurity phases in the diffraction peaks, indicating that the composite structure we obtained is of high purity.

[0018] Such as figure 2 As shown, the evenly distributed hollow square structure can be seen from the figure.

[0019] Such as image 3 As shown, it can be seen from the figure that the MoS 2 Nanosheets were successfully coated on the surface of CdS hollow squares to form a heterostructure.

[0020] Such as Figure 4 As shown in the figure, it can be clearly seen that the CdS / MoS 2 The composite photocatalyst has excellent photocatalytic hydrogen production performance. When the mass ratio of cadmium carbonate, sodium molybdate and thiourea is 1:1.2:4, the photocatalytic hydrogen production efficiency is the highest.

Embodiment 3

[0021] Example 3CdS / MoS 2 Visible light catalytic activity experiments of heterojunction composite photocatalysts

[0022] (1) Weigh CdS / MoS 2 Put 100 mg of composite photocatalyst in a photocatalytic hydrogen production reactor, add 100 ml of water, and 10 ml of lactic acid and stir for 20 minutes.

[0023] (2) The amount of hydrogen gas generated was measured every hour by gas chromatography.

[0024] (3) by Figure 4 It can be seen that the prepared composite photocatalyst has excellent visible light catalytic activity, and the hydrogen production performance of the composite sample is higher than that of pure CdS.

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Abstract

The invention relates to the technical field of composite nanomaterials and in particular discloses a method for preparing a CdS / MoS2 composite hollow-block photocatalyst by taking cadmium acetate, sodium bicarbonate, PVP, sodium molybdate and thiourea as raw materials, particularly a method for preparing a component photocatalyst with the advantages of simple preparation process and excellent visible-light catalytic activity of the product. The method comprises the following steps: weighing cadmium acetate and PVP, and dissolving in deionized water according to a mass ratio of 1:10; adding sodium bicarbonate into the mixture, so that the mass ratio of the cadmium acetate to sodium bicarbonate is 1:2; stirring and reacting at room temperature for 2 hours, washing and centrifuging the product after the reaction is completed, thereby obtaining cadmium carbonate; dissolving the cadmium carbonate, sodium molybdate and thiourea in the deionized water according to a mass ratio of (1):(0.15-1.4):(4), mixing and stirring, carrying out a hydrothermal reaction under the condition of 220 DEG C for 24 hours, washing and centrifuging the product after the reaction is completed, and drying, thereby obtaining the CdS / MoS2 composite photocatalyst.

Description

technical field [0001] The invention relates to the technical field of composite nanomaterials, in particular to a method for preparing CdS / MoS with cadmium acetate, sodium bicarbonate, PVP, sodium molybdate and thiourea as raw materials. 2 A method for compounding a hollow square photocatalyst, especially a method for preparing a compound photocatalyst with simple preparation process and good visible light catalytic activity. [0002] technical background [0003] Since the 21st century, problems such as resource depletion and environmental pollution caused by the extensive use of fossil fuels have made the development and utilization of environmentally friendly new clean energy sources increasingly urgent. Among them, hydrogen energy, as the most potential clean energy source, has attracted a large amount of research investment. Hydrogen production by photo-splitting water is a promising technology that can realize the conversion of solar energy to chemical energy, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/02B01J37/10
CPCB01J27/051B01J37/10B01J35/39B01J35/00B01J35/30
Inventor 刘瑜蔡晓毓
Owner JIANGSU UNIV
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