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Nano semiconductor photocatalyst and preparation method thereof

A nano-semiconductor and photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of intensifying photogenerated electron-hole recombination and reducing photogenerated charges Separation efficiency, high energy consumption of interfacial charge transfer, etc., to improve photocatalytic performance, promote interfacial charge transfer, and reduce charge recombination

Inactive Publication Date: 2019-09-13
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the contact between the semiconductor and the metal produces energy band bending and a large potential barrier at the contact interface. When charge transfer is performed by thermionic emission, photogenerated electrons need to overcome the potential barrier formed by the energy band bending, and the interface charge transfer energy consumption Usually larger, kinetically inhibits interfacial charge transfer, reduces photogenerated charge separation efficiency, and intensifies photogenerated electron-hole recombination, resulting in low photocatalytic reaction efficiency

Method used

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  • Nano semiconductor photocatalyst and preparation method thereof
  • Nano semiconductor photocatalyst and preparation method thereof
  • Nano semiconductor photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: CdS|CdS(t)

[0038]The CdS nanorod photocatalyst was ultrasonically dispersed in deionized water to form a dispersion with a solid content of 1.5 g / L, which was magnetically stirred at 60°C for 5 hours; the prepared cadmium acetate solution with a concentration of 0.25 mol / L was added drop by drop Add it to the dispersion liquid at a drop rate of 30 s / mL, stir for 2 hours, centrifuge, wash with deionized water three times to remove excess cadmium ions. Add the prepared sodium sulfide solution with a concentration of 0.5 mol / L to the cadmium sulfide nanorod dispersion that has adsorbed cadmium ions dropwise at a rate of 30 s / mL. After stirring for 1 hour, centrifuge and separate the obtained solid The material was washed and centrifuged multiple times with ethanol and water. Put the obtained yellow solid substance into a vacuum drying oven and keep it at 60° C. for 12 hours, and finally obtain a CdS nanorod photocatalytic material with an ultra-thin CdS elect...

Embodiment 2

[0040] Example 2: TiO 2 |TiO 2 ( t )

[0041] Anatase TiO 2 The nanoparticle photocatalyst was dispersed in isopropanol solvent, and ultrasonically dispersed for 3 hours to form a dispersion liquid with a solid content of 500 mg / L; after keeping at room temperature for 1 hour, 1 mol / L isopropyl titanate solution Add drop by drop, control the drop rate to 50s / mL, pour into a 100mL polytetrafluoroethylene sleeve; put the sealed polytetrafluoroethylene sleeve into a 100ml stainless steel reaction kettle, heat to 160°C, keep for 6 hours, and then cool naturally ; The suspension after the reaction was subjected to high-speed centrifugation, and ultrasonically cleaned several times with absolute ethanol and deionized water; the washed solid matter was placed in a vacuum drying oven and kept at 60°C for 12 hours, and finally the surface TiO 2 TiO with electronic intermediary layer 2 Nanophotocatalyst.

[0042] Disperse 20 mg of the prepared photocatalyst in 200 ml of water, con...

Embodiment 3

[0043] Example 3: BiVO 4 |CdS( t )

[0044] BiVO 4 Nanosheet photocatalyst, ultrasonically dispersed in deionized water to form a dispersion with a solid content of 50g / L, and magnetically stirred at 90°C for 3h; the prepared cadmium nitrate solution with a concentration of 0.5 mol / L was added dropwise to the dispersion solution, control the drop rate to 30 s / mL, stir for 3 hours, centrifuge, wash with deionized water three times to remove excess cadmium ions. Add the prepared sodium sulfide solution with a concentration of 1.0 mmol / L dropwise to the cadmium sulfide nanorod dispersion that has adsorbed cadmium ions, control the drop rate to 30 s / mL, keep it for 3 hours, and then centrifuge to separate the obtained solid The material was washed several times with ether and water. Put the obtained yellow solid substance in a vacuum drying oven and keep it at 60°C for 12 hours, and finally obtain BiVO with an ultra-thin CdS electron mediator layer on the surface. 4 Nanoshee...

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Abstract

The invention provides a nano semiconductor photocatalyst and a preparation method thereof and belongs to the field of photocatalysts. An ultrathin electronic media layer with an electron tunneling function is constructed on the surface of the nano semiconductor photocatalyst, and aims to reduce electron transfer energy consumption between the nano semiconductor photocatalyst and a reduction cocatalyst, promote interfacial charge transfer and improve photocatalytic performance. Particularly, since the electronic media layer with the electron tunneling function is constructed in the invention,the interfacial charge transfer energy consumption is reduced, and a considerable chemical reaction rate of photocatalysis in weak light such as sunlight can be realized. In addition, the electronic media layer constructed in the invention is capable of enabling the catalyst to maintain excellent stability. By constructing the electronic media layer with the electron tunneling function, the nano semiconductor photocatalyst disclosed by the invention has the biggest significance of realizing direct sunlight catalysis.

Description

technical field [0001] The invention belongs to the field of photocatalysts, and in particular relates to a nanometer semiconductor photocatalyst and a preparation method thereof. Background technique [0002] Photocatalysis is one of the ideal ways to use solar energy to obtain clean energy. Nano-semiconductor photocatalysts have problems such as serious electron-hole recombination, catalyst photocorrosion, and slow charge transport during the photocatalytic reaction process, resulting in poor catalyst stability and low photocatalytic reaction efficiency. Current research usually employs conductive (metallic) nanostructures, supported noble metal catalysts to enhance charge transport or facilitate spatial separation of photogenerated charges. The specific structure can be found in the appendix figure 1 , with figure 1 It is a schematic diagram of the structure of the existing nano-semiconductor photocatalyst loaded with reduction co-catalysts. However, the contact betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J23/52B01J23/80B01J27/051B01J27/185B01J27/24B01J27/057B01J27/224B01J23/44B01J35/02B01J35/00
CPCB01J27/045B01J23/52B01J23/80B01J27/051B01J27/1853B01J27/24B01J27/0573B01J27/224B01J23/44B01J35/39B01J35/40
Inventor 陈加藏乔玮
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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