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A direct z-type heterojunction photocatalyst that can be used to split water and its preparation method

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, oxygen preparation, etc., can solve the problems of insufficient activity and inability to oxidize water molecules into oxygen, achieve enhanced reduction activity, improve easy Effects of reunion, valence band correction

Active Publication Date: 2021-12-17
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem that the oxidation reaction of heterojunction materials in the prior art is not active enough to oxidize water molecules into oxygen, the present invention provides a direct Z-type heterojunction photocatalyst that can be used to split water and its preparation method; Design the composite method of material selection and its energy band structure, so that the prepared heterojunction photocatalyst can generate active free radicals in water, thus effectively solving the problem of insufficient oxidation reaction activity of heterojunction materials and the inability to oxidize water molecules into oxygen question

Method used

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  • A direct z-type heterojunction photocatalyst that can be used to split water and its preparation method
  • A direct z-type heterojunction photocatalyst that can be used to split water and its preparation method
  • A direct z-type heterojunction photocatalyst that can be used to split water and its preparation method

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Embodiment 1

[0046] This embodiment provides a direct Z-type heterojunction photocatalyst that can be used for splitting water and its preparation method. In the heterojunction photocatalyst, TiO 2 and ZnIn 2 S 4 The mass ratio is 10:676.2, which is TNZIS-10 in the present invention, and its specific preparation method is as follows:

[0047] (1) Add 0.5mL of titanium tetrachloride to 15mL of ethylene glycol solution, stir evenly until completely dissolved, transfer the resulting mixed solution to a hydrothermal reaction kettle, seal the reaction kettle, and place it in an oven at 170°C for water Heat treatment for 4h. After the reaction, the resulting product was repeatedly washed with ultrapure water and absolute ethanol, centrifuged and vacuum-dried to obtain TiO 2 Nanosheets.

[0048] (2) Take 0.083g ultra-thin TiO 2 Nanosheets in a mixed solution of glycerol and water (glycerol 26mL, water 40mL), ultrasonically dispersed for 0.8h, then add 2.0g indium chloride, 0.9g zinc chloride...

Embodiment 2

[0051] This embodiment provides a direct Z-type heterojunction photocatalyst that can be used for splitting water and its preparation method. In the heterojunction photocatalyst, TiO 2 and ZnIn 2 S 4 The mass ratio is 30:676.2, which is TNZIS-30 in the present invention, and its specific preparation method is as follows:

[0052] (1) Add 1mL of titanium tetrachloride to 20mL of ethylene glycol solution, stir until completely dissolved, transfer the resulting mixed solution to a hydrothermal reaction kettle, seal the reaction kettle, and place it in an oven at 150°C for hydrothermal treatment 5h. After the reaction, the resulting product was repeatedly washed with ultrapure water and absolute ethanol, centrifuged and vacuum-dried to obtain TiO 2 Nanosheets.

[0053] (2) Take 0.049g ultra-thin TiO 2 Nanosheets in a mixed solution of glycerol and water (35mL of glycerol, 95mL of water), ultrasonically dispersed for 1.2h, then added 3.8g of indium chloride, 2.1g of zinc chlor...

Embodiment 3

[0056] This embodiment provides a direct Z-type heterojunction photocatalyst that can be used for splitting water and its preparation method. In the heterojunction photocatalyst, TiO 2 and ZnIn 2 S 4The mass ratio is 80:676.2, which is TNZIS-80 in the present invention, and its specific preparation method is as follows:

[0057] (1) Add 2 mL of titanium tetrachloride to 40 mL of ethylene glycol solution, stir evenly until completely dissolved, transfer the resulting mixed solution to a hydrothermal reaction kettle, seal the reaction kettle, and place it in an oven at 180°C for hydrothermal treatment 3h. After the reaction, the resulting product was repeatedly washed with ultrapure water and absolute ethanol, centrifuged and vacuum-dried to obtain TiO 2 Nanosheets.

[0058] (2) Take 0.136g ultra-thin TiO 2 Nanosheets in a mixed solution of glycerol and water (36 mL of glycerol, 100 mL of water), ultrasonically dispersed for 1.9 h, then added 3.5 g of indium chloride, 2.9 g...

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Abstract

The invention discloses a direct Z-type heterojunction photocatalyst which can be used for splitting water and a preparation method thereof, and belongs to the technical field of nanometer material preparation, photocatalytic environmental energy and pollutant treatment. It includes compound R 1 and compound R 2 , the compound R 1 and compound R 2 There is a Z-type heterojunction between them; the compound R 1 and compound R 2 One of them has a valence band position > 2.38eV, and the other has a valence band position < 2.38eV; under the irradiation of a light source, the Z-type heterojunction can be catalyzed to generate ·OH in water. The invention can improve the redox activity of the heterojunction photocatalyst, enhance the photocatalytic performance of the heterojunction material to decompose water and generate hydrogen and oxygen, wherein TiO 2 / ZnIn 2 S 4 Direct Z-type heterojunction photocatalyst for water splitting and H evolution 2 and O 2 The rate can reach 214.9 μmol g ‑ 1 h ‑1 and 81.7 μmol g ‑1 h ‑1 .

Description

technical field [0001] The invention belongs to the technical field of nano-material preparation and photocatalytic environmental energy and pollutant treatment, and more specifically relates to a direct Z-type heterojunction photocatalyst that can be used to split water and a preparation method thereof. Background technique [0002] Due to its high energy density, storability, and transportability, hydrogen energy is considered as a future green energy in the growing energy demand. Among various sustainable and economical hydrogen production methods, photocatalytic water splitting (simultaneously producing hydrogen and oxygen) technology is one of the hot research directions at present. Therefore, exploring efficient, stable, and economical photocatalysts is of great significance for a sustainable future. In the field of photocatalysis research, about titanium dioxide (TiO 2 ) is the most active research, and it has been widely used in photoelectric conversion, air purifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04C01B3/04C01B13/02
CPCB01J27/04C01B3/042C01B13/0207C01B2203/0277C01B2203/1076B01J35/39Y02E60/36
Inventor 鲜啟鸣王鋙葶左淦丞
Owner NANJING UNIV
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