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a multiple junction 2 Nano-heterostructure photocatalyst and preparation method thereof

A nano-heterostructure, photocatalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem that the separation efficiency of electron-hole pair is not high enough , high energy band structure and energy band matching requirements, small driving force, etc., to achieve excellent photocatalytic activity, promote light absorption performance, and promote the effect of space separation

Active Publication Date: 2020-12-25
ZHEJIANG UNIV
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Problems solved by technology

However, this method has high requirements for the energy band structure and energy band matching of semiconductor materials, and the built-in electric field of a single heterojunction has a small driving force for carriers, and the separation efficiency of electron-hole pairs is still not high enough.
[0004] Therefore, while achieving TiO 2 High utilization of solar energy and effective spatial separation of carriers remain a great challenge

Method used

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  • a multiple junction <sub>2</sub> Nano-heterostructure photocatalyst and preparation method thereof
  • a multiple junction <sub>2</sub> Nano-heterostructure photocatalyst and preparation method thereof
  • a multiple junction <sub>2</sub> Nano-heterostructure photocatalyst and preparation method thereof

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Effect test

Embodiment 1

[0033] Multi-junction TiO 2 The preparation steps of the nano-heterostructure photocatalyst are as follows: (1): 0.1 g anatase phase TiO 2 The powder was added to 10 mL of chloroplatinic acid solution, and the concentration of the chloroplatinic acid solution was 0.25 mM. Stir at room temperature for 30 minutes under ultraviolet light, centrifuge and dry to obtain Pt-TiO 2 ; (2): Pt-TiO obtained in step (1) 2 Place it in a tube furnace, feed hydrogen gas, and keep the gas flow rate at 25 mL / min. The temperature was raised to 500 °C at a heating rate of 5 °C / min, and kept for 4 h, and then rapidly cooled to room temperature to obtain Pt-TiO 2 -H; (3): Weigh 0.1 g of Pt-TiO obtained in step (2) 2 -H powder, added to 2.5 mL silver nitrate solution, the concentration of silver nitrate solution was 0.93 mM. Stirred at room temperature for 30 min under visible light, centrifuged and dried to obtain Pt-TiO 2 -H-Ag, that is, multi-junction TiO 2 Nanostructured photocatalysts.

...

Embodiment 2

[0036] Multi-junction TiO 2 The preparation steps of the nano-heterostructure photocatalyst are as follows: (1): 0.1 g anatase phase TiO 2 The powder was added to 20 mL of chloroplatinic acid solution, and the concentration of the chloroplatinic acid solution was 0.25 mM. Stir at room temperature for 30 minutes under ultraviolet light, centrifuge and dry to obtain Pt-TiO 2 ; (2): Pt-TiO obtained in step (1) 2 Place it in a tube furnace, feed hydrogen gas, and keep the gas flow rate at 25 mL / min. The temperature was raised to 500 °C at a heating rate of 5 °C / min, and kept for 4 h, and then rapidly cooled to room temperature to obtain Pt-TiO 2 -H; (3): Weigh 0.1 g of Pt-TiO obtained in step (2) 2 -H powder, added to 2.5 mL silver nitrate solution, the concentration of silver nitrate solution was 0.93 mM. Stirred at room temperature for 30 min under visible light, centrifuged and dried to obtain Pt-TiO 2 -H-Ag, that is, multi-junction TiO 2 Nanostructured photocatalysts. ...

Embodiment 3

[0039] Multi-junction TiO 2 The preparation steps of the nano-heterostructure photocatalyst are as follows: (1): 0.1 g anatase phase TiO 2 The powder was added to 40 mL of chloroplatinic acid solution, and the concentration of the chloroplatinic acid solution was 0.25 mM. Stir at room temperature for 30 minutes under ultraviolet light, centrifuge and dry to obtain Pt-TiO 2 ; (2): Pt-TiO obtained in step (1) 2 Place it in a tube furnace, feed hydrogen gas, and keep the gas flow rate at 25 mL / min. The temperature was raised to 500 °C at a heating rate of 5 °C / min, and kept for 4 h, and then rapidly cooled to room temperature to obtain Pt-TiO 2 -H; (3): Weigh 0.1 g of Pt-TiO obtained in step (2) 2 -H powder, added to 2.5 mL silver nitrate solution, the concentration of silver nitrate solution was 0.93 mM. Stirred at room temperature for 30 min under visible light, centrifuged and dried to obtain Pt-TiO 2 -H-Ag, that is, multi-junction TiO 2 Nanostructured photocatalysts. ...

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Abstract

The invention discloses a multi-junction TiO 2 Nanoheterostructure photocatalyst and preparation method thereof. First, platinum is deposited by light, and the platinum is used to treat TiO 2 Partial crystal faces of nanocrystals are protected and in platinum and crystalline TiO 2 A Schottky junction is formed at the interface. A disordered layer is introduced at the unprotected part of the crystal plane through hydrogenation, and the crystal TiO 2 and form n‑n at the disordered layer + Knot. Through photoreduction, an ohmic contact is formed at the interface of silver and disordered layer. Finally, multiple junctions of TiO were obtained 2 Nanoheterostructured photocatalysts. The preparation process provided by the invention is simple, and the prepared catalyst can simultaneously achieve effective spatial separation of photogenerated carriers and improve solar energy utilization, and has excellent photocatalytic performance.

Description

technical field [0001] The invention belongs to the field of preparation of metal oxide functional materials, in particular to a multi-junction TiO 2 Nano-heterostructure photocatalyst and preparation method thereof. Background technique [0002] With the increasing global environmental protection and the continuous growth of energy demand, the development of sustainable, clean and low-cost energy is one of the major themes in the field of environmental energy. The use of metal oxide semiconductor materials to achieve high-efficiency conversion of solar energy to chemical energy is a promising high-efficiency photocatalytic technology. Among them, TiO 2 As a photocatalyst, due to its low price, environmental friendliness and chemical stability, it is widely used in photocatalytic degradation of organic pollutants, photocatalytic water splitting to produce hydrogen, photocatalytic reduction of CO 2 and photovoltaic devices. However, due to TiO 2 The bandgap width is larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J23/42B01J23/50B01J35/00B01J37/16B01J37/18B01J37/34C01B3/04
CPCB01J37/344B01J37/18B01J37/16B01J23/42B01J23/50B01J21/063C01B3/042B01J35/39Y02E60/36Y02P20/133
Inventor 王智宇于思琦钱国栋樊先平
Owner ZHEJIANG UNIV
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