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Preparation method and application of CeO2-xSx/CdZnS/ZnO nano material

A nano-material and hydrothermal reaction technology, applied in the field of catalytic chemistry, can solve the problems of greening photocatalysts and achieve the effects of enhanced utilization of visible light, low solubility, and good hydrogen evolution performance

Pending Publication Date: 2022-03-11
YANGZHOU UNIV
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Problems solved by technology

[0005] There are still some shortcomings in the technology of using photocatalysts to produce hydrogen: the greening of photocatalysts is still difficult, and there is still a long way to go for the reuse of photocatalysts and the harmless treatment of materials.

Method used

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  • Preparation method and application of CeO2-xSx/CdZnS/ZnO nano material
  • Preparation method and application of CeO2-xSx/CdZnS/ZnO nano material
  • Preparation method and application of CeO2-xSx/CdZnS/ZnO nano material

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preparation example Construction

[0032] CeO of the present invention 2-x S x The preparation method of / CdZnS / ZnO nanometer material comprises the steps:

[0033] (1) Add sodium citrate solution to urea solution to obtain a mixture of urea and sodium citrate;

[0034] (2) Add cerous chloride to the mixed solution obtained in step (1) and stir evenly, slowly add hydrogen peroxide, and stir;

[0035] (3) The mixed liquid obtained in step (2) is subjected to hydrothermal reaction, cooled after the reaction, centrifuged and cleaned, and dried to obtain CeO 2 ;

[0036] (4) CeO obtained in step (3) 2 Together with thiourea, put it into a tube furnace for calcination and vulcanization, and obtain a dark gray powder sample CeO 2-x S x .

[0037] (5) The sulfided sample CeO obtained in step (4) 2-x S x Ultrasonic with water to form a suspension, add cadmium nitrate, zinc nitrate and ethylenediamine to stir, the resulting mixture is subjected to hydrothermal reaction, cooled after the reaction, centrifuged an...

Embodiment 1

[0041] (1) Put 1.4g of urea in 180mL of ultrapure water for ultrasonic dispersion for 5min, add 90mL of 10mM / L sodium citrate solution, react for 10min under vigorous stirring, add 1.1g of cerium chloride, stir for 30min, then add 15mL / min Add 1.4mL hydrogen peroxide dropwise at a constant speed, and keep stirring for 30min. Add the light yellow mixed solution formed by the reaction into a 50mL polytetrafluoroethylene high-pressure hydrothermal reaction kettle, react at 180°C for 22h, and after natural cooling, centrifugally clean and dry at 70°C to obtain light yellow CeO 2 sample.

[0042] (2) Put the dried sample into the ark together with 8g of thiourea in a tube furnace for vulcanization to obtain CeO 2-x S x , keep the reaction at 500°C for 2h, and the heating program is 2°C / min.

[0043] (3) Take 0.5 mMCeO 2-x S x Place in 30 mL of deionized water to form a suspension with ultrasonic waves to disperse evenly, add 0.5 mM cadmium nitrate and 0.5 mM zinc nitrate, stir...

Embodiment 2

[0045] Change the MCeO in step (3) on the basis of embodiment 1 2-x S x , the ratio of cadmium nitrate and zinc nitrate, so that the molar ratio of the three is 1:8:8, that is, "take 0.5 mMCeO 2-x S x Place in 30 mL of deionized water to form a suspension with ultrasonic waves, make it evenly dispersed, add 4mM cadmium nitrate and 4mM zinc nitrate", and the rest are exactly the same as in Example 1 to obtain CeO 2-x S x / CdZnS / ZnO, referred to as CCZS-8.

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Abstract

The invention discloses a CeO2-xSx / CdZnS / ZnO nano material and application thereof in photocatalytic hydrogen production. The hollow CeO2-xSx / CdZnS / ZnO nano material which is good in crystal form, obviously improved in conductivity and obviously enhanced in hydrogen production performance is synthesized by a simple and convenient method. According to the preparation method, the hollow CeO2 nano material is taken as a template, the CdZnS particles are loaded on the surfaces of the CeO2 nano particles by adopting a traditional hydrothermal method, so that the hollow hair-ball-shaped nano material is formed, the impedance of the material is reduced, the current density is increased, the compounding of photo-induced electrons and holes is greatly reduced by the compounded material, and the photoelectric conversion efficiency is improved. And meanwhile, a layer of zinc oxide shell is formed on the surface, so that the influence of photocorrosion on the material is greatly reduced, and the potential of the material in photocatalytic hydrogen production application is excited based on the principle.

Description

technical field [0001] The invention belongs to the field of catalytic chemistry, in particular to a photocatalytic hydrogen production catalyst and its preparation method and application. Background technique [0002] With the development of the times and science and technology, energy has become a pivotal issue that affects the national development pattern, geopolitics, and environmental protection and ecology. As a representative of new energy, hydrogen energy represents the future development direction. Traditionally, water has been electrolyzed, or hydrogen has been obtained as a chemical by-product. However, its disadvantage is that these technologies themselves have great energy consumption, the gains outweigh the losses, and the cost performance is not high. As a new method, the technology of splitting water to produce hydrogen through photocatalyst has the advantages of low cost, stable chemical properties, and environmental friendliness. [0003] The scientific ...

Claims

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Application Information

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IPC IPC(8): B01J27/04C01B3/04
CPCB01J27/04C01B3/042B01J35/39Y02E60/36
Inventor 白静怡谢壮壮刁国旺
Owner YANGZHOU UNIV
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