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Hydroxyl and nitrogen-doped cerium fluoride visible light photocatalyst and preparation method thereof

A technology of photocatalyst and cerium fluoride, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of no performance of visible light catalytic oxygen production, poor photocatalytic performance, etc., and achieve excellent photocatalytic performance. The effect of catalytic oxygen production performance, high oxygen production efficiency and simple process

Active Publication Date: 2021-10-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CeF 3 The rich energy level structure has the ideal photogenerated carrier ability, which is a potential high-efficiency photocatalyst, but the high optical band gap of 5.2eV limits the application, and the photocatalytic performance is poor, especially in the visible light catalytic oxygen production. , often using its up-conversion properties to combine with other materials for photocatalysis

Method used

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  • Hydroxyl and nitrogen-doped cerium fluoride visible light photocatalyst and preparation method thereof
  • Hydroxyl and nitrogen-doped cerium fluoride visible light photocatalyst and preparation method thereof
  • Hydroxyl and nitrogen-doped cerium fluoride visible light photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) 2mmol Ce(NO 3 ) 3 Dissolve in 10ml deionized water, add 8mmol NH 4 10ml of the aqueous solution of F to form a precursor suspension.

[0028] (2) Transfer the obtained precursor suspension to a reaction kettle, and perform a high-temperature hydrothermal reaction at 220 °C for 10 h to obtain hydroxyl and nitrogen-doped cerium fluoride (OH, N-CeF 3 ) Visible light photocatalyst, denoted as OH, N-CeF 3 / 220.

[0029] AgNO 3 As a sacrificial agent, the visible light photocatalyst was irradiated for 2 hours under a 300w xenon lamp (filter: λ>400nm), and it was found that the oxygen production rate of the visible light photocatalyst was 1277 μmol g -1 h -1 , indicating excellent visible-light oxygen-generating activity.

Embodiment 2

[0031] (1) 2mmol Ce(NO 3 ) 3 Dissolve in 10ml deionized water, add 8mmol NH 4 10ml of the aqueous solution of F to form a precursor suspension.

[0032] (2) Transfer the obtained precursor suspension to a reaction kettle, and conduct a hydrothermal reaction at 200°C for 10 h to obtain hydroxyl and nitrogen-doped cerium fluoride (OH,N-CeF 3 ) visible light photocatalyst.

[0033] AgNO 3 As a sacrificial agent, the visible light photocatalyst was irradiated for 2 hours under a 300w xenon lamp (filter: λ>400nm), and it was found that the oxygen production rate of the visible light photocatalyst was 858 μmol g -1 h -1 , indicating excellent visible-light oxygen-generating activity.

Embodiment 3

[0035] (1) 2mmol Ce(NO 3 ) 3 Dissolve in 10ml deionized water, add 8mmol NH 4 10ml of the aqueous solution of F to form a precursor suspension.

[0036](2) Transfer the obtained precursor suspension to a reaction kettle, and perform a high-temperature hydrothermal reaction at 240°C for 10 hours to obtain hydroxyl and nitrogen-doped cerium fluoride (OH,N-CeF 3 ) visible light photocatalyst.

[0037] AgNO 3 As a sacrificial agent, the visible light photocatalyst was irradiated for 2 hours under a 300w xenon lamp (filter: λ>400nm), and it was found that the oxygen production rate of the visible light photocatalyst was 1073 μmol g -1 h -1 , indicating excellent visible-light oxygen-generating activity.

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Abstract

The invention discloses a hydroxyl and nitrogen-doped cerium fluoride visible light photocatalyst and a preparation method thereof. The preparation method comprises the steps that precursor turbid liquid containing Ce <3+>, F<-> and NH4 <+> is subjected to a hydrothermal reaction at the temperature of 200-300 DEG C, the intrinsic energy band structure of cerium fluoride is changed under the influence of hydroxyl and nitrogen co-doping, and the hydroxyl and nitrogen doped cerium fluoride visible light photocatalyst is obtained. In the reaction process, NH4<+> can be hydrolyzed to generate trace NH3.H2O under the acidic condition except being used as an N source, and OH is provided. The preparation method is simple to operate, the intrinsic band gap of CeF3 is effectively reduced through co-doping of OH and N, continuous regulation and control of an energy band structure are achieved, and the catalyst responds to visible light and shows excellent visible light oxygen production performance.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic water splitting, and in particular relates to a hydroxyl and nitrogen doped cerium fluoride visible light photocatalyst and a preparation method thereof. Background technique [0002] Semiconductor photocatalytic water splitting to generate hydrogen and oxygen is one of the key research directions to solve the energy crisis and provide renewable clean energy. The standard hydrogen electrode potential required for the water oxidative decomposition half reaction is 1.23eV, and the doped modified photocatalytic material has a suitable visible light absorption band gap, and the valence band must be higher than 1.23eV to carry out the oxygen generation half reaction. Although some catalysts doped and modified have obtained the ability to absorb visible light and have good performance in degrading pollutants under visible light, their valence band position is too low, resulting in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/12B01J27/24B01J35/00B01J37/10C01B13/02
CPCB01J27/24B01J27/12B01J37/10C01B13/0207B01J35/39
Inventor 王智宇韩冰钱国栋樊先平
Owner ZHEJIANG UNIV