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Cd<1-x>Zn<x>S-Ni/MoS<2> composite photocatalyst, and preparation method and application thereof

A cd1-xznxs-ni, composite light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of difficulty in preparing nanospheres, and achieve excellent photocatalytic water splitting. The effect of efficiency, low cost and simple operation method

Inactive Publication Date: 2019-09-13
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, doping CdS usually requires high-temperature and high-pressure hydrothermal / solvothermal reaction conditions, and the inventors have found that until now, nanospheres assembled from Zn, Ni co-doped CdS particles have been difficult was prepared

Method used

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  • Cd&lt;1-x&gt;Zn&lt;x&gt;S-Ni/MoS&lt;2&gt; composite photocatalyst, and preparation method and application thereof
  • Cd&lt;1-x&gt;Zn&lt;x&gt;S-Ni/MoS&lt;2&gt; composite photocatalyst, and preparation method and application thereof
  • Cd&lt;1-x&gt;Zn&lt;x&gt;S-Ni/MoS&lt;2&gt; composite photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Synthesis of CdS assembled nanospheres

[0053] Pour 100 ml of deionized water into a clean and dry beaker (250 ml), then add 7 ml of 0.1 mol / liter sodium citrate aqueous solution, 5 ml of 0.1 mol / liter cadmium chloride aqueous solution, and 10 ml 0.1 mol / L thiourea aqueous solution, and finally 2 ml of ammonia water was added dropwise, and stirred for 5 minutes to obtain a clear and transparent solution. Then put the beaker into an ultrasonic machine (ultrasonic power is 500 watts) after being sealed with a plastic wrap, and react at 50 degrees Celsius for 6 hours. After the reaction was finished, it was naturally cooled to room temperature, the product was separated by centrifugation, and washed three times alternately with ethanol and deionized water. Finally, the product was put into a vacuum drying oven and dried at 70 degrees Celsius for 6 hours to obtain CdS assembled nanospheres.

[0054] figure 1 is the X-ray diffraction pattern of the obtained CdS assem...

Embodiment 2

[0058] (1)MoS 2 Preparation of nanosheets

[0059] 1 mmol MoCl 5 and 10.1 mmoles of thioacetamide were sequentially added into 35 ml of N,N-dimethylformamide solvent for ultrasonic dissolution, and then stirred evenly to obtain a precursor solution. The precursor solution was transferred to a 50 ml polytetrafluoroethylene-lined autoclave, and placed in an oven at 200 degrees Celsius for 24 hours to react. After the reactor was cooled to room temperature, the solid product in the solution was centrifuged, washed alternately with water and ethanol for 3 times, and dried in a vacuum oven at 70 degrees Celsius for 6 hours to obtain MoS 2 Nanosheets.

[0060] figure 1 is the obtained MoS 2 The X-ray diffraction pattern of the nanosheet, it can be seen that the diffraction signal of the product is consistent with that of MoS 2 consistent with.

[0061] (2)MoS 2 Photolysis of water hydrogen production activity test of nanosheets

[0062] Take 20 mg of MoS synthesized in step...

Embodiment 3

[0064] Step (1) is with the step (1) of embodiment 1

[0065] Step (2) is the same as the step (1) of embodiment 2

[0066] (3) Synthesis of CdS / MoS 2 nanospheres. 0.02 g of MoS from step (2) 2 Nanosheets were added to 100 ml of N,N-dimethylformamide for ultrasonic exfoliation for 3 hours, then 0.2 g of CdS nanospheres prepared in step (1) were added, and after ultrasonic mixing for 1 hour, stirring was continued for 12 hours for electrostatic adsorption assembly process . After the reaction was completed, the solid product in the solution was centrifuged, washed three times alternately with water and ethanol, and dried in a vacuum oven at 70 degrees Celsius for 6 hours to obtain CdS / MoS 2 composite nanospheres.

[0067] (4)CdS / MoS 2 Photolysis of Water and Hydrogen Production Activity of Composite Nanospheres

[0068] First take 20 mg of CdS / MoS synthesized in step (3) 2 The composite nanospheres were ultrasonically dispersed in 100 ml of lactic acid aqueous solution co...

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Abstract

The invention relates to a Cd<1-x>Zn<x>S-Ni / MoS<2> composite photocatalyst, and a preparation method and application thereof, belonging to the field of inorganic nanomaterials. MoS<2> nanosheets in the composite have low crystallinity and are capable of exposing a large number of hydrogen-producing active sites. The doping of Zn and Ni significantly increases the redox ability of the photogenerated charges of CdS and promotes the separation of the photogenerated charges. Assembled nanospheres with uniform size have good resistance to light corrosion and aggregation. The combination of an ultrasonic water bath method and electrostatic adsorption assembling used for synthesis of the material is simple and controllable; and the composite prepared by using the method can realize high-efficiency photocatalytic decomposition of water for hydrogen production under visible light without loading of precious metals, so energy consumption and cost are greatly reduced. The prepared composite has acatalytic hydrogen production rate of up to 112 mmol / h / g.

Description

technical field [0001] The invention relates to the field of inorganic nanomaterials, in particular to a highly efficient Cd 1-x Zn x S-Ni / MoS 2 Composite photocatalyst and preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Energy shortage and environmental pollution are two major problems restricting the development of the world today. In order to realize the sustainable development of human society, the demand for environmental purification and clean energy production is becoming more and more urgent. With the continuous increase of social energy consumption, the demand for fossil fuels will further increase. However, due to the non-renewabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/10B01J37/10B82Y30/00B82Y40/00C01B3/04C25B1/04C25B11/06G01N33/00
CPCB01J27/0515B01J37/10B82Y30/00B82Y40/00C01B3/042C25B1/04G01N33/005C01B2203/1058C01B2203/0277C25B1/55C25B11/091B01J35/39B01J35/23B01J35/33B01J35/61Y02E60/36
Inventor 王磊林海峰黎艳艳马晓伟
Owner QINGDAO UNIV OF SCI & TECH
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