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Crystal face proportion-controllable bismuth vanadate photocatalyst synthesis method, catalyst, and application of catalyst

A photocatalyst, bismuth vanadate technology, applied in vanadium compounds, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low quantum efficiency of photocatalysts and uncontrolled synthesis of photocatalysts. It has been developed and other issues to achieve the effect of suppressing the reverse reaction, cheap materials, and high oxygen production quantum efficiency.

Active Publication Date: 2017-09-12
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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  • Crystal face proportion-controllable bismuth vanadate photocatalyst synthesis method, catalyst, and application of catalyst
  • Crystal face proportion-controllable bismuth vanadate photocatalyst synthesis method, catalyst, and application of catalyst
  • Crystal face proportion-controllable bismuth vanadate photocatalyst synthesis method, catalyst, and application of catalyst

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 as follows: 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 (with a mass concentration of 25%-28%) to obtain a yellow suspension, and continue stirring for 2 hours to obtain a 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 ph...

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 of the solution to pH=0.25, 0.50, 0.75, and 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 24h. 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 morph...

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Abstract

The invention provides a crystal face proportion-controllable bismuth vanadate photocatalyst, and a synthesis method thereof. The photocatalyst is sued for high-efficiency photocatalysis of water oxidation. The growth process of the bismuth vanadate photocatalyst is controlled to accurately regulate the transition of the phase structure of the photocatalyst from a tetragonal phase to a monoclinic phase and the change of the monocrystalline morphology from a micro-spherical shape to a regular decahedral morphology, so the (010) and (011) proportions of the decahedron are effectively controlled. The aquatic product oxygen decomposition activity of the optimized decahedral bismuth vanadate photocatalyst in the presence of a Fe<3+> soluble electron acceptor reaches 60.0 L / kg / h or above, and the oxygen production apparent quantum efficiency at 460 nm reaches 60% or above. The photocatalyst still has good activity under outdoor sunlight, can be recycled multiple times, and has good stability. The method has a simple preparation process, and the prepared photocatalyst has the advantages of high activity, high stability, non-toxicity, greenness, realization of high-efficiency catalysis of the water oxygen under the sunlight, and hopefulness for being coupled with a hydrogen production catalyst in large-scale solar photocatalytic decomposition of water for producing 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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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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