Quantum dot-modified multi-shell CaTiO3 cube, and preparation method and application thereof

A technology of quantum dots and cubes, applied in the field of quantum dot-modified multi-shell CaTiO3 cubes and their preparation, can solve the problem of poor photocatalyst active sites and the like

Active Publication Date: 2021-02-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and rapid Z-type Ni 2 P / CaTiO 3 A synthetic method for heterojunction materials, which is used to increase the abundance of active sites in intershell channels to promote the performance of photocatalytic water splitting for hydrogen production. The method uses calcium nitrate tetrahydrate, tetrabutyl titanate, sodium hydroxide, hexahydrate Nickel nitrate and sodium hypophosphite were used as raw materials to prepare multishelled CaTiO using a simple hydrothermal method combined with calcination 3 Cube and Ni 2 Ni of P quantum dots with Z-type electron transport mechanism 2 P / CaTiO 3 heterojunction materials

Method used

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  • Quantum dot-modified multi-shell CaTiO3 cube, and preparation method and application thereof
  • Quantum dot-modified multi-shell CaTiO3 cube, and preparation method and application thereof
  • Quantum dot-modified multi-shell CaTiO3 cube, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Step: Ni 2 Preparation of P quantum dots

[0030] First, 0.5mol Ni(NO 3 ) 2 ·6H 2 O was dispersed in deionized water, slowly added to 0.15M NaOH solution under magnetic stirring, and then dried in an oil bath at 80 °C. Add a certain amount of NaH 2 PO 2 Grind for 30 min in an agate mortar. Next, the mixture was placed in a porcelain boat wrapped in tinfoil and heated in a tube furnace at 400 °C for 4 h at 2 °C / min, N 2 . It is worth noting that the molar ratio of Ni:OH:P is 1:10:10. Finally, the Ni 2 P quantum dots.

Embodiment 2

[0032] Step: Z type Ni 2 P / CaTiO 3 Preparation of heterojunction

[0033] First, 10mmol Ca(NO 3 ) 2 4H 2 O was dispersed in 30 mL deionized water. After vigorous stirring for 60 min, 3.4ml tetrabutyl titanate was added dropwise to the above solution. Then 0.02 mol of sodium hydroxide was put into it and stirred under constant magnetic force for 30 min. Finally, the Ni 2 P was dispersed in the above solution and after stirring for 30 min, the mixture was transferred to a 50 ml polytetrafluoroethylene-lined stainless steel autoclave at 200 °C for 24 h at autogenous pressure. The precipitate was washed several times by centrifugation with ethanol and deionized water. Finally, the Z-type Ni was prepared by drying 2 P / CaTiO 3 Heterojunction.

[0034] Furthermore, in composite materials, Ni 2 P and CaTiO 3 The mass ratio is 0.005:1.

[0035] Further, marked as Ni 2 P / CaTiO 3 -0.5%.

Embodiment 3

[0037] Step: Z type Ni 2 P / CaTiO 3 Preparation of heterojunction

[0038] First, 10mmol Ca(NO 3 ) 2 4H 2 O was dispersed in 30 mL deionized water. After vigorous stirring for 60 min, 3.4ml tetrabutyl titanate was added dropwise to the above solution. Then 0.02 mol of sodium hydroxide was put into it and stirred under constant magnetic force for 30 min. Finally, the Ni 2 P was dispersed in the above solution and after stirring for 30 min, the mixture was transferred to a 50 ml Teflon-lined stainless steel autoclave at 200°C for 24 hours under autogenous pressure. The precipitate was washed several times by centrifugation with ethanol and deionized water. Finally, the Z-type Ni was prepared by drying 2 P / CaTiO 3 Heterojunction.

[0039] Furthermore, in composite materials, Ni 2 P and CaTiO 3 The mass ratio is 0.01:1.

[0040] Further, marked as Ni 2 P / CaTiO 3 -1%.

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Abstract

The invention belongs to the technical field of preparation of semiconductor materials, and particularly relates to a quantum dot-modified multi-shell CaTiO3 cube, and a preparation method and application thereof. According to the invention, calcium nitrate tetrahydrate, tetrabutyl titanate, sodium hydroxide, nickel nitrate hexahydrate and sodium hypophosphite are used as raw materials, and a simple hydrothermal method and a calcination method are combined to prepare the Ni2P / CaTiO3 heterojunction material with Z-type electron transport mechanism of the multi-shell CaTiO3 cube and Ni2P quantumdots. The Ni2P quantum dots are modified between shells and on the surface of the multi-shell CaTiO3 cube and used for improving abundance of active sites of channels between the shells so as to promote photocatalytic decomposition of water to produce hydrogen.

Description

technical field [0001] The invention belongs to the technical field of semiconductor material preparation, in particular to multi-shell CaTiO modified with quantum dots 3 Cube and its preparation method and use. Ni prepared by the present invention 2 Multishell CaTiO modified with P quantum dots 3 Cubes are used to enhance the abundance of active sites in the intershell channels to promote the photocatalytic water splitting hydrogen production performance. The present invention constructs Ni 2 Multishelled CaTiO modified by P QDs 3 Z-type electron transport mechanism of cubes for photocatalytic water splitting to hydrogen production. Background technique [0002] Traditional hydrogen production methods mainly use fossil fuels to produce hydrogen. In the production process, there are problems such as low fuel utilization, serious pollution, and high energy consumption. In recent years, the use of solar semiconductors to photocatalytically split water has opened up a new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/02C01B3/04
CPCB01J27/1853B01J35/004B01J35/02C01B3/042C01B2203/0277C01B2203/1058Y02E60/36
Inventor 蒋恩慧刘春波李春雪宋宁左延
Owner JIANGSU UNIV
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