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Composite photocatalyst and preparation method thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problems of limited speed, irregular electronic distribution, and limited light absorption cross section, and achieve the effects of large light absorption cross section, improved light absorption efficiency, and large specific surface area

Pending Publication Date: 2018-11-23
HUBEI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing technology has the following problems: first, the light absorption cross-section of zero-dimensional quantum dots or one-dimensional quantum rods is limited, and the light absorption efficiency of the catalyst needs to be improved; second, the electronic structure of the previously used quantum dots / rods has not been Due to the special design, the electron population is irregular, which leads to: on the one hand, the speed of electron transfer from the quantum dot / rod to the co-catalyst is limited, and it is difficult to achieve efficient separation of the interface charges between the two; on the other hand, the separated electrons are transferred to the quantum The recombination process of dots / rods cannot be effectively controlled, and the lifetime of separated electrons is affected by the recombination process, which makes it difficult to meet the long-distance diffusion requirements of electrons in cocatalysts
The light absorption cross-sections of the above-mentioned zero-dimensional quantum dots and one-dimensional quantum rods and the defects in the interfacial charge process between the quantum dots / rods and the co-catalyst lead to the limitation of the photocatalytic performance of the composite catalyst.

Method used

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  • Composite photocatalyst and preparation method thereof
  • Composite photocatalyst and preparation method thereof
  • Composite photocatalyst and preparation method thereof

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preparation example Construction

[0030]The invention provides a preparation method of a composite photocatalyst, comprising: containing MoS 2 The first reaction solution of the nanosheets is added dropwise to the second reaction solution containing type II CdSe / CdTe quantum wells and ultrasonically dispersed to obtain a composite photocatalyst.

[0031] In some specific embodiments of the present invention, the ultrasonic frequency is 25KHz-130KHz, and the ultrasonic dispersion time is 1-8h, such as 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, etc., according to the ultrasonic frequency, reaction solution Concentration and other actual conditions can be selectively adjusted.

[0032] will contain MoS 2 The reaction solution of the nanosheets is ultrasonically dispersed in the reaction solution containing type II CdSe / CdTe quantum wells, which has good controllability, low cost and wide application range. The as-prepared composite photocatalysts targetedly enhance the transition from quantum wells to MoS 2 Electron tran...

Embodiment 1

[0053] A method for preparing a composite photocatalyst, comprising:

[0054] S1. Dissolve cadmium myristate and selenium powder in octadecene, vacuumize for 30 minutes, and heat at 100-150° C. for 1 hour in a vacuum environment to obtain a uniform and transparent pretreatment solution. Under the protection of nitrogen, the temperature of the pretreatment solution was raised to 200°C, cadmium acetate dihydrate was added quickly, and then the temperature was raised to 230-260°C, and the reaction was terminated with an ice bath after reacting at this temperature for 20 minutes. The reaction liquid was centrifuged at 3000rpm for 20min, separated and collected to obtain the CdSe quantum sheet core layer material. The seed solution is obtained by dispersing the CdSe quantum sheet core layer material in octadecene. Wherein, in the pretreatment solution: the concentration of the cadmium source is 0.05mol / L, the molar ratio of the cadmium source, the selenium source and the cadmium a...

Embodiment 2

[0061] A kind of preparation method of composite photocatalyst, its difference with embodiment 1 is:

[0062] In S5, CdSe / CdTe quantum wells and MoS 2 The mass ratio of the nanosheets is 8:2, and the MoS in the first reaction solution 2 The concentration of nanosheets is 1.5 × 10 -4 mol / L, the concentration of type II CdSe / CdTe quantum wells in the second reaction liquid is 2×10 -4 mol / L.

[0063] In S6, the frequency of ultrasonic dispersion is 50KHz, and the time of ultrasonic dispersion is 8h.

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Abstract

The invention discloses a composite photocatalyst and a preparation method thereof, and belongs to the field of photocatalysis. The composite photocatalyst comprises a MoS2 nanosheet and an II type CdSe / CdTe quantum well adsorbed to the MoS2 nanosheet, wherein the II type CdSe / CdTe quantum well comprises a CdSe quantum chip nuclear layer and a CdTe quantum chip shell layer. The composite photocatalyst has the advantages of high light absorption efficiency, high separation efficiency of interfacial charge, weak recombination action of the interfacial charge, high quantum yield of photocatalytichydrogen production and the like. The preparation method of the composite photocatalyst comprises the following steps: dropwise adding first reaction liquid containing the MoS2 nanosheet into secondreaction liquid containing the II type CdSe / CdTe quantum well and carrying out ultrasonic dispersion to obtain the composite photocatalyst. The preparation method has the advantages of good controllability, low cost and wide application range; the prepared photocatalyst has high light absorption efficiency and high hydrogen production efficiency.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a composite photocatalyst and a preparation method thereof. Background technique [0002] Solar photocatalytic hydrogen production, as a "dream technology in the 21st century", is considered to be one of the ultimate solutions to energy and environmental problems. Since Fujishima and Honda first reported the phenomenon of photocatalytic hydrogen production in 1972, researchers have conducted a lot of research on photocatalysts and made a series of breakthroughs and progress. [0003] Semiconductors commonly used in photocatalysts are TiO 2 、C 3 N 4 , NiS, etc., and compared with such traditional semiconductors: the spectrum and energy level of quantum-confined low-dimensional nanocrystals (quantum materials such as quantum dots, quantum rods, and quantum sheets) can be adjusted with their size, and due to their The quantum confinement effect, whose wave function is strongly exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057C01B3/02
CPCC01B3/02B01J27/0576B01J35/396B01J35/39
Inventor 梁桂杰陈美华汪竞阳李望南王松程晓红吴凯丰
Owner HUBEI UNIV OF ARTS & SCI
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