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Pucherite-based photocatalyst and preparation method and application thereof

A technology of photocatalyst and bismuth vanadate, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Changes, unsatisfactory control effects, etc., to achieve the effect of simple and easy preparation of the catalyst, low price, and mild reaction conditions

Active Publication Date: 2016-05-04
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific exposed crystal planes of prism-shaped bismuth vanadate are {010} and {110} crystal planes, and it is still difficult to control their morphology and the proportion of exposed crystal planes
It has been reported in the literature that the morphology and crystal plane of bismuth vanadate can be controlled by adding surfactants or crystal plane directing agents, but the method is relatively complicated, and it is impossible to achieve a wide range of modulation of the exposed crystal plane ratio, and the control effect is not ideal

Method used

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  • Pucherite-based photocatalyst and preparation method and application thereof
  • Pucherite-based photocatalyst and preparation method and application thereof
  • Pucherite-based photocatalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Precursor NH 4 VO 3 (50mmol) and Bi(NO 3 ) 3 ·5H 2 O (50 mmol) was dissolved in 200 mL of an aqueous solution with a nitric acid concentration of 2.0 M, and the pH of the solution was adjusted to 2.0 with ammonia water under stirring conditions. Then add a certain amount of KCl to adjust the concentration of chloride ions in the solution to be 0.03moldm -3 . After aging for 2 h, the precipitate was transferred to a PTFE-lined stainless steel autoclave with a capacity of 100 mL for hydrothermal treatment at 210 °C for 20 h. After cooling, the orange-yellow powder was separated by filtration, washed several times with deionized water, and dried overnight at 60°C. After drying, the powder was calcined at 500°C for 2h. That is, BiVO with {010} crystal face exposure ratio of 20% 4 - {010} 20% Catalyst. Take 10mg of the prepared BiVO 4 - {010} 20%, added to 5mL formaldehyde-water solution with a mass percentage of formaldehyde of 20%. Vacuumize or pass inert gas un...

Embodiment 2

[0036] Precursor NH 4 VO 3 (50mmol) and Bi(NO 3 ) 3 ·5H 2 O (50mmol) was dissolved in 200mL of 2.0M aqueous solution of nitric acid, and the pH value of the solution was adjusted to 1.8 with ammonia water under stirring conditions. Then add a certain amount of NaCl to adjust the concentration of chloride ions in the solution to be 3.0moldm -3 . After aging for 2 h, the precipitate was transferred to a PTFE-lined stainless steel autoclave with a capacity of 100 mL for hydrothermal treatment at 190 °C for 30 h. After cooling, the orange-yellow powder was separated by filtration, washed several times with deionized water, and dried overnight at 60°C. After drying, the powder was calcined at 500°C for 2h. That is, BiVO with {010} crystal plane exposure ratio of 80% 4 - {010} 80% Catalyst. Further use of photodeposition method in BiVO 4 The {110} facet deposited MnO x , that is, MnO x -BiVO 4 - {010} 80% Catalyst. Take 10mg of the prepared MnO x -BiVO 4 -{010}80%, a...

Embodiment 3

[0038] Precursor NH 4 VO 3 (60mmol) and Bi(NO 3 ) 3 ·5H 2 O (60mmol) was dissolved in 200mL of an aqueous solution with a nitric acid concentration of 2.0M, and the pH of the solution was adjusted to 2.0 with ammonia water under stirring conditions. Then add a certain amount of ZnCl 2 Used to adjust the concentration of chloride ions in the solution to 0.5moldm -3 . After aging for 2 h, the precipitate was transferred to a PTFE-lined stainless steel autoclave with a capacity of 100 mL for hydrothermal treatment at 200 °C for 24 h. After cooling, the orange-yellow powder was separated by filtration, washed several times with deionized water, and dried overnight at 60°C. After drying, the powder was calcined at 500°C for 2h. That is, BiVO with a {010} crystal plane exposure ratio of 60% 4 - {010} 60% Catalyst. Further use of photodeposition method in BiVO 4 Pt is deposited on the {010} crystal plane, and MnO is deposited on the {110} crystal plane x , that is, Pd-MnO...

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Abstract

The invention relates to a photocatalyst, in particular to a pucherite-based photocatalyst and a preparation method and application thereof. The chemical formula of the pucherite-based photocatalyst is BiVO4, the crystal phase of the pucherite-based photocatalyst is a monoclinic phase, the grain size of the pucherite-based photocatalyst is 1-5 micrometers, the morphology of the pucherite-based photocatalyst is a pyramid frustum, and the exposed specific crystal faces of the pucherite-based photocatalyst are {010} and {110} crystal faces. The preparation method includes the steps that firstly, precursors NH4VO3 and Bi(NO3)3 are dissolved in a nitric acid water solution, the pH value of the solution is regulated with ammonium hydroxide, then soluble chlorate is added to regulate the concentration of chloride ions in the solution, and after aging, precipitate is transferred into a stainless steel autoclave with a polytetrafluoroethylene liner for hydrothermal treatment; then, orange-yellow powder is subjected to filtering separation, washed with deionized water, dried and roasted, and the pucherite-based photocatalyst is obtained. The pucherite-based photocatalyst can be applied to preparing dihydric alcohol through potocatalytic conversion of formaldehyde or acetaldehyde. The price of raw materials is low, and the photocatalyst is easy to prepare, stable in catalytic performance and high in reactivity.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a bismuth vanadate-based photocatalyst and a preparation method and application thereof. Background technique [0002] Photocatalysis is a technology with good development prospects. It has been actively applied in the photocatalytic degradation of organic pollutants, and it also has good application potential in photolysis of water. In addition, it also has a good application prospect in photocatalytic organic synthesis. In 1912, Ciamician first proposed the concept of photocatalytic organic synthesis, and then the method of photocatalytic organic synthesis has been developed rapidly. Harnessing sunlight to produce high value-added chemicals from abundant and cheap raw materials is considered to be one of the most attractive ways to achieve sustainable chemical synthesis. Photocatalytic organic synthesis involves a variety of redox reactions, among which the carbon-carbon coupling reaction h...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J37/10C07C29/14C07C31/20
CPCC07C29/14B01J23/22B01J37/10B01J35/39C07C31/202C07C31/205C07C31/207
Inventor 王野谢顺吉沈泽斌范文青吴雪娇林锦池张庆红
Owner XIAMEN UNIV
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