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Visible-light-responsive BiOI photocatalyst as well as preparation method and application thereof

A photocatalyst and visible light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor product dispersion, easy agglomeration, and affecting photocatalytic activity

Active Publication Date: 2021-09-17
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that it is easy to cause too high local concentration, the obtained product has poor dispersion, is easy to agglomerate, and the particle size is uneven, which affects the exposure of surface active sites and thus affects the photocatalytic activity.

Method used

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  • Visible-light-responsive BiOI photocatalyst as well as preparation method and application thereof
  • Visible-light-responsive BiOI photocatalyst as well as preparation method and application thereof
  • Visible-light-responsive BiOI photocatalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0028] The invention provides a kind of preparation method of the BiOI photocatalyst of visible light response, comprises the following steps:

[0029] (1) Mix 1,3,5-benzenetricarboxylic acid, bismuth nitrate pentahydrate, and methanol for solvothermal reaction to obtain Bi-MOF;

[0030] (2) After the Bi-MOF obtained in the step (1) is activated, it is placed in a closed container with iodine simple substance, and an adsorption reaction is carried out to obtain a BiOI photocatalyst.

[0031] In the invention, 1,3,5-benzenetricarboxylic acid, bismuth nitrate pentahydrate and methanol are mixed and subjected to solvothermal reaction to obtain Bi-MOF. In the present invention, the 1,3,5-benzenetricarboxylic acid is used as an organic ligand, the bismuth nitrate pentahydrate provides metal bismuth, and the methanol is used as a solvent, and the 1,3,5-benzenetricarboxylic acid, pentahydrate Bismuth nitrate and methanol form hexagonal metal complexes under solvothermal conditions. ...

Embodiment 1

[0053] (1) 1,3,5-Benzenetricarboxylic acid (3.57mmol, 750mg) and bismuth nitrate pentahydrate powder (0.31mmol, 150mg). Put them into 100mL beakers one by one, and add methanol (molecular weight 32.04, 60mL). The mixed solution was ultrasonically dispersed for 5 minutes to make the solution evenly mixed, then moved to a 100mL polytetrafluoroethylene reactor, and kept in an oven at 120°C for 24 hours to carry out solvothermal reaction; after the reaction, centrifuged at 8000r / min for 5min, Then the centrifuged solid was washed three times with methanol; the collected white solid was dried in a vacuum oven at 60°C for 12 hours to obtain a white powder product Bi-MOF. Wherein, the ratio of 1,3,5-benzenetricarboxylic acid to bismuth nitrate pentahydrate is 3.57:0.31.

[0054] (2) Activate the Bi-MOF prepared in step (1) in a vacuum oven at 120°C for 12 hours, then use a high-precision digital balance to weigh two parts of the activated Bi-MOF (20 mg) as the adsorbent, and put it ...

Embodiment 2

[0067] The difference from Example 1 is that the adsorption temperature is 45° C., and the rest of the steps are the same as in Example 1. The amount of iodine adsorbed by Bi-MOF in the obtained BiOI is 871.92 mg / g.

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Abstract

The invention provides a visible-light-responsive BiOI photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of catalytic materials. According to the preparation method, Bi-MOF is firstly prepared, and solvent molecules and reactant molecules in a Bi-MOF skeleton structure are removed through activation, so that the influence on subsequent chemical adsorption is prevented, and the specific surface area of the Bi-MOF is increased; the iodine elementary substance enters metal organic framework Bi-MOF pore channels in a chemical adsorption manner and chemically react with O and Bi in the Bi-MOF framework to form BiOI, so that BiOI agglomeration generated in the chemical adsorption process can be prevented, and the dispersity of BiOI can be further improved; and moreover, the adsorption reaction is carried out in the closed device, so that the purity of the BiOI can be improved, the crystallinity of the BiOI can also be improved, and the prepared BiOI has relatively high visible light catalytic activity.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a visible light-responsive BiOI photocatalyst and a preparation method thereof. Background technique [0002] With the rapid economic development, environmental pollution and energy depletion have caused many global problems. Semiconductor photocatalysis technology has been considered as an ideal way to solve energy and environmental problems because it can convert solar energy into chemical energy for clean fuel synthesis and environmental restoration. In the process of photocatalytic reaction, the absorption utilization rate of light and the separation and transfer efficiency of carriers are the key factors affecting the catalytic activity of semiconductor photocatalysts. So far, this technology has not been applied on a large scale. The main reasons are: first, the efficiency of photocatalytic conversion directly using sunlight is low; second, the separation effic...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J35/00B01J35/02B01J37/00
CPCB01J27/06B01J37/0009B01J35/00B01J35/30B01J35/39Y02W10/37
Inventor 吕英秦珩杰李萍王凯陈雪莲肖美霞
Owner XI'AN PETROLEUM UNIVERSITY
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