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Preparation method and application of ultrathin two-dimensional metal phthalocyanine/bismuth vanadate composite photocatalyst

Active Publication Date: 2019-06-28
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of poor charge separation performance and high recombination probability of photogenerated carriers in the bulk phase in the bismuth vanadate-based heterojunction composite system prepared in the prior art, and provides an ultra-thin two-dimensional metal phthalocyanine / Preparation method and application of bismuth vanadate composite photocatalyst

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  • Preparation method and application of ultrathin two-dimensional metal phthalocyanine/bismuth vanadate composite photocatalyst
  • Preparation method and application of ultrathin two-dimensional metal phthalocyanine/bismuth vanadate composite photocatalyst
  • Preparation method and application of ultrathin two-dimensional metal phthalocyanine/bismuth vanadate composite photocatalyst

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specific Embodiment approach 1

[0034] Specific Embodiment One: This embodiment is a preparation method of an ultra-thin two-dimensional metal phthalocyanine / bismuth vanadate composite photocatalyst, which is completed in the following steps:

[0035] 1. Preparation of bismuth vanadate precursor suspension: add bismuth source and surfactant to the alcohol solvent, stir until the bismuth source and surfactant are completely dissolved, then add sodium metavanadate, and then stir to obtain vanadate Bismuth precursor suspension;

[0036] The mass ratio of surfactant and bismuth source described in step 1 is (1.05~5.25):(2.21~11.05);

[0037] The mass ratio of sodium metavanadate described in step 1 and bismuth source is (2.80~14):(2.21~11.05);

[0038] 2. Add metal phthalocyanine to the bismuth vanadate precursor suspension, and then stir to obtain a reaction solution;

[0039] The mass ratio of the bismuth source in the metallophthalocyanine and the bismuth vanadate precursor suspension described in step 2 is...

specific Embodiment approach 2

[0050] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume ratio of the mass of the bismuth source described in step 1 to the alcohol solvent is (2.21g-11.05g): (60mL-300mL). Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0051]Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, add the bismuth source and the surfactant to the alcohol solvent, stir until the bismuth source and the surfactant are completely dissolved, and then add sodium metavanadate, and then stirred and reacted at a stirring speed of 100r / min to 300r / min for 20min to 30min to obtain a bismuth vanadate precursor suspension. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method and application of an ultrathin two-dimensional metal phthalocyanine / bismuth vanadate composite photocatalyst, and relates to a preparation method of a bismuth vanadate radical composite photocatalyst. According to the preparation method and the application, the problems that a bismuth vanadate-based heterojunction composite system prepared by the priorart has poor charge separation performance and high recombination probability of photo-generated carriers in a bulk phase are solved. The method comprises the following steps of: 1, preparing bismuthvanadate precursor turbid liquid; 2, adding metal phthalocyanine into the bismuth vanadate precursor turbid liquid; 3, carrying out a hydrothermal reaction; and 4, roasting to obtain the ultrathin two-dimensional metal phthalocyanine / bismuth vanadate composite photocatalyst. The prepared ultrathin two-dimensional metal phthalocyanine / bismuth vanadate composite photocatalyst is used for photocatalytic reduction of carbon dioxide. The ultrathin two-dimensional metal phthalocyanine / bismuth vanadate composite photocatalyst can be prepared by the preparation method.

Description

technical field [0001] The invention relates to a preparation method and application of a bismuth vanadate-based composite photocatalyst. Background technique [0002] With the rapid development of modern society, the rapid consumption of energy has also brought serious environmental pollution and greenhouse effect. The conversion of carbon dioxide into solar fuels by semiconductor photocatalysis technology is an ideal way to solve the above problems. [0003] In the past decades, people have been trying to find an efficient, cheap and stable photocatalyst for photocatalytic CO2 reduction. Among many photocatalysts, BiVO 4 With its wide source, stable chemical properties, non-toxic and other advantages, it is favored by people. But BiVO 4 The relatively positive conduction band energy level position (~0eV vs SHE) makes it unable to effectively separate the electron-hole pairs under visible light irradiation; and the light absorption range is limited and usually shows poo...

Claims

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Application Information

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IPC IPC(8): B01J31/36C07C1/02
Inventor 井立强边辑曲阳冯建南张紫晴
Owner HEILONGJIANG UNIV
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