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BiVO4 interface photocatalyst as well as preparation method and application thereof

A photocatalyst and photocatalytic technology, which is applied in the field of photocatalytic materials, can solve the problems of low synthesis efficiency, insufficient catalytic reaction driving force, and low photon quantum efficiency, and achieve the effects of high-efficiency activation, improved synthesis efficiency, and enhanced absorption

Active Publication Date: 2021-02-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solves the problem of BiVO in the prior art 4 It has low photon quantum efficiency, insufficient catalytic reaction driving force, photocatalytic H 2 o 2 Technical problems such as low synthesis efficiency

Method used

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  • BiVO4 interface photocatalyst as well as preparation method and application thereof
  • BiVO4 interface photocatalyst as well as preparation method and application thereof
  • BiVO4 interface photocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This embodiment provides a BiVO 4 The preparation method of interface photocatalyst, this method specifically comprises the following steps:

[0045] (1) Preparation of BiVO 4

[0046] Dissolve 36mmol of bismuth nitrate and ammonium metavanadate in equimolar ratio in 300ml of 2mol / L nitric acid, stir at room temperature for 30 minutes, add ammonia water dropwise to adjust the pH of the solution to 2, stir for 1 hour, and age at room temperature for 2 hours. Transfer the slurry to the reactor, conduct a hydrothermal reaction at 200°C for 24 hours, wash and dry to obtain BiVO 4 Precursor. Will get BiVO 4 The precursor was placed in a muffle furnace and calcined at 400 °C for 2 hours to obtain BiVO 4 .

[0047] (2) Preparation of ligand monolayer

[0048] Get 0.5g to get BiVO through step (1) 4 Add 200ml of a mixed solution of ethanol and water, the volume ratio of ethanol and water in the mixed solution is 4:1, ultrasonically disperse for 30 minutes, then add the ...

Embodiment 2

[0069] This embodiment provides a BiVO 4 The preparation method of interface photocatalyst, this method specifically comprises the following steps:

[0070] (1) Preparation of BiVO 4

[0071] Dissolve 10mmol of bismuth nitrate and ammonium metavanadate in equimolar ratio in 60ml of 2mol / L nitric acid, stir at 40°C for 60 minutes, add ammonia water dropwise to adjust the pH of the solution to 2.5, stir for another 2 hours, and age at room temperature for 2 hours. Transfer the slurry to the reactor, conduct a hydrothermal reaction at 200°C for 12 hours, wash and dry to obtain BiVO 4 Precursor. Will get BiVO 4 The precursor was placed in a muffle furnace and calcined at 450 °C for 2 hours to obtain BiVO 4 .

[0072] (2) Preparation of ligand monolayer

[0073] Get 0.5g to get BiVO through step (1) 4 Add 200ml of a mixed solution of ethanol and water (the volume ratio of ethanol and water is 1:1), ultrasonically disperse for 30 minutes, then add the ligand 3-aminopropyltri...

Embodiment 3

[0077] This embodiment provides a BiVO 4 The preparation method of interface photocatalyst, this method specifically comprises the following steps:

[0078] (1) Preparation of BiVO 4

[0079] Dissolve 12mmol of bismuth nitrate and ammonium metavanadate in equimolar ratio in 60ml of 2mol / L nitric acid, stir at room temperature for 60 minutes, add ammonia water dropwise to adjust the pH of the solution to 7, stir for 1 hour, and age for 2 hours at room temperature. Transfer the slurry to the reactor, conduct a hydrothermal reaction at 180°C for 24 hours, wash and dry to obtain BiVO 4 Precursor. Will get BiVO 4 The precursor was placed in a muffle furnace and calcined at 400 °C for 4 hours to obtain BiVO 4 .

[0080] (2) Preparation of ligand monolayer

[0081] Get 0.5g to get BiVO through step (1) 4 Add 200ml of a mixed solution of ethanol and water (the volume ratio of ethanol and water is 3:1), ultrasonically disperse for 30 minutes, then add the ligand 3-aminopropyltr...

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Abstract

The invention belongs to the field of photocatalytic materials, and particularly relates to a BiVO4 interface photocatalyst as well as a preparation method and an application thereof. The photocatalyst comprises a BiVO4 substrate, a ligand monomolecular layer formed on the surface of the BiVO4 substrate, and noble metal loaded on the ligand monomolecular layer, wherein the ligand monomolecular layer is obtained through a condensation reaction between a ligand containing an electron donating group and the surface of a BiVO4 substrate, the noble metal is loaded on the ligand monomolecular layerthrough coordination with the electron donating group, and the BiVO4 interface photocatalyst is a hydrophobic photocatalyst. According to the invention, the local coordination environment and the overall surface / interface polarity of the photocatalyst are regulated and controlled, so that the enrichment of electrons on the reaction active sites of the photocatalyst and the change of the surface and interface characteristics of the material are realized. Therefore, the technical problems of low light quantum efficiency, insufficient photocatalytic reaction driving force, low photocatalytic H2O2synthesis efficiency and the like of BiVO4 in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, more specifically, relates to a BiVO 4 Interface photocatalyst, preparation method and application. Background technique [0002] In 1972, Fujishima and Honda used n-type semiconductor TiO 2 Electrode photocatalytic splitting of water to generate H 2 and O 2 , this research opened the prelude to the research of semiconductor photocatalysis. But intrinsic TiO 2 It only has ultraviolet light response. In the entire solar spectrum, the energy in the ultraviolet light region is only less than 5%, while the energy in the visible light region can reach more than 43%. Therefore, photocatalysts with visible light response are the hotspots of current research. [0003] As a general green oxidant, hydrogen peroxide has been widely used in many important industrial productions (such as pulp bleaching, detergent, wastewater treatment, etc.). H is currently produced industrially 2 o 2 The most ...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J23/648B01J31/02B01J37/16B01J37/34C01B15/027
CPCB01J23/22B01J23/6482B01J31/0275B01J37/16B01J37/341C01B15/027B01J35/394B01J35/33B01J35/39
Inventor 张延荣孙明辉
Owner HUAZHONG UNIV OF SCI & TECH
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