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Synthesis, Catalyst and Application of Bismuth Vanadate Photocatalyst with Controlled Facet Ratio

A photocatalyst, bismuth vanadate technology, applied in vanadium compound, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low quantum efficiency of photocatalyst and controllable synthesis of photocatalyst. It has been developed and other issues to achieve the effect of inhibiting the occurrence of reverse reactions, cheap materials, and improving reaction efficiency.

Active Publication Date: 2020-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported literature shows that the current BiVO 4 The quantum efficiency of photocatalysts is still low, and BiVO with high photocatalytic activity 4 Controlled synthesis of photocatalysts remains unexplored

Method used

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  • Synthesis, Catalyst and Application of Bismuth Vanadate Photocatalyst with Controlled Facet Ratio
  • Synthesis, Catalyst and Application of Bismuth Vanadate Photocatalyst with Controlled Facet Ratio
  • Synthesis, Catalyst and Application of Bismuth Vanadate Photocatalyst with Controlled Facet Ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of BiVO with different crystal phases and morphologies by hydrothermal method 4 catalyst of light:

[0033] The preparation process of the precursor is: 0.04mol of bismuth nitrate and 0.04mol of ammonium metavanitate are respectively dissolved in 300mL of 2mol / L nitric acid solution. Adjust the pH value of the solution to pH=0.4 with ammonia water (mass concentration 25%-28%) to obtain a yellow suspension, and continue stirring for 2 hours to obtain the bismuth vanadate precursor;

[0034] Hydrothermal treatment process: The prepared bismuth vanadate precursor suspension was transferred to eight 100mL hydrothermal reaction kettles with a volume of 70mL, and then placed in an oven at 200°C for hydrothermal reaction for different times. After the reaction was completed, the solution was cooled to room temperature, centrifuged, washed three times with secondary water, and dried in an oven at 80° C. for 8 hours. That is, different crystal phases and morphologi...

Embodiment 2

[0037] Preparation of BiVO with different crystal phases and morphologies by oil bath method under atmospheric pressure 4 catalyst of light:

[0038] The preparation process of the precursor is as follows: 0.02mol of bismuth nitrate and 0.02mol of ammonium metavanitate are respectively dissolved in 70mL of 2mol / L nitric acid solution. Adjust the pH value of the solution to pH=0.4 with ammonia water (with a mass concentration of 25%-28%) to obtain a yellow suspension, and continue stirring for 2 hours to obtain a bismuth vanadate precursor;

[0039] Oil bath process under normal pressure: transfer the prepared bismuth vanadate precursor suspension into a 250mL round-bottomed flask, fill the volume of the solution to 60% of the volume of the container, and then place it in an oil bath at 80°C for reflux and stirring. Sampling at different reaction times. After the reaction was completed, the solution was cooled to room temperature, centrifuged, washed three times with secondar...

Embodiment 3

[0042] Preparation of decahedral BiVO with different facet ratios by hydrothermal method 4 catalyst of light:

[0043] The preparation process of the precursor is as follows: 0.04mol of bismuth nitrate and 0.04mol of ammonium metavanitate are respectively dissolved in 120mL of 2mol / L nitric acid solution. Adjust the pH value of the solution to pH=0.25, 0.50, 0.75, 1.00 with ammonia water (mass concentration 25%-28%) to obtain a yellow suspension, and continue stirring for 2 hours to obtain a bismuth vanadate precursor.

[0044] Hydrothermal treatment process: The prepared bismuth vanadate precursor suspension was transferred to four 100mL hydrothermal reaction kettles with a volume of 70mL, and then placed in an oven for hydrothermal reaction at 200°C for 12h. After the reaction was completed, the solution was cooled to room temperature, centrifuged, washed three times with secondary water, and dried in an oven at 80° C. for 8 hours. That is, different crystal phases and mor...

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Abstract

The invention provides a bismuth vanadate photocatalyst with controllable crystal plane ratio and its synthesis, which are used for efficient photocatalytic water oxidation. By controlling the growth process of bismuth vanadate-based photocatalysts, precisely regulating the phase structure transition from tetragonal to monoclinic, and the change of single crystal morphology from micro-spherical to regular decahedral, the (010 ) to (011) crystal plane ratio. The optimized decahedral bismuth vanadate photocatalyst on Fe 3+ In the presence of soluble electron acceptors, the activity of decomposing water to produce oxygen is over 60.0L / kg / h, and the apparent quantum efficiency of oxygen production at 460nm is over 60%. At the same time, the photocatalyst still exhibits good activity when applied to outdoor sunlight, and the catalyst can be recycled many times with good stability. The preparation process of this method is simple, and the prepared photocatalyst has high activity and stability, is non-toxic and green, and can realize efficient catalytic water oxidation under sunlight, and is expected to be coupled with a hydrogen-producing catalyst for large-scale solar photocatalytic water splitting to produce hydrogen.

Description

technical field [0001] The invention belongs to the field of photocatalyst synthesis, provides a bismuth vanadate photocatalyst with controllable crystal plane ratio and its synthesis technology, and applies it to highly efficient photocatalytic water oxidation. Background technique [0002] With the continuous growth of population and economy, energy shortage and environmental pollution have become two major problems to be solved in the world today. Solar energy has attracted much attention as a clean and abundant renewable energy. At present, the utilization of solar energy mainly includes conversion of solar energy into heat energy, conversion of solar energy into electrical energy, conversion of solar energy into biomass energy and conversion of solar energy into chemical energy. Among them, solar photocatalysis converts solar energy into chemical energy, which can directly store solar energy, solve the demand for mobile energy, and realize the optimal utilization of hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22C01G31/00C01B13/02C30B29/30C30B29/66C30B7/10C30B7/14
CPCC30B7/10C30B7/14C30B29/30C30B29/66C01B13/0207C01G31/00B01J23/22B01J35/39
Inventor 李灿赵越李仁贵秦炜
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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