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Preparation method for bismuth phosphate photocatalyst with different microstructures

A photocatalyst and microscopic morphology technology, applied in the field of photocatalysis, can solve the problems of difficult separation and recovery, high photogenerated hole-electron recombination rate, low utilization rate of sunlight, etc., and achieve low cost, simple and easy preparation method, Avoid the effects of the hydrothermal process

Inactive Publication Date: 2014-07-23
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 There are still some shortcomings that are difficult to overcome, such as low utilization rate of sunlight, high recombination rate of photogenerated holes-electrons, and difficulty in separation and recovery.

Method used

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  • Preparation method for bismuth phosphate photocatalyst with different microstructures
  • Preparation method for bismuth phosphate photocatalyst with different microstructures
  • Preparation method for bismuth phosphate photocatalyst with different microstructures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve 1 mmol of bismuth nitrate in 50 ml of nitric acid solution with a molar concentration of 0.5 mol / L, add 0.5 mmol of EDTA disodium salt, stir well, then add 1 mmol of sodium dihydrogen phosphate to obtain a mixed solution; Add a sodium hydroxide solution with a molar concentration of 1 mol / L to adjust the pH of the system to 1, and let it stand at room temperature for 60 hours to obtain a precipitate; centrifuge the precipitate, wash it, dry it, and then calcinate it at 400°C. Obtain cypress leaf bismuth phosphate photocatalyst. Depend on figure 1 It can be seen that the prepared bismuth phosphate photocatalyst is cypress leaf-shaped, with good dispersion and regular appearance.

Embodiment 2

[0016] Dissolve 2 mmol of bismuth nitrate in 50 ml of nitric acid solution with a molar concentration of 3 mol / L, add 0.5 mmol of EDTA disodium salt, stir well, then add 2 mmol of sodium dihydrogen phosphate to obtain a mixed solution; Add sodium hydroxide solution with a molar concentration of 3 mol / L, adjust the pH of the system to 1, and let it stand at room temperature for 120 hours to obtain a precipitate; centrifuge the precipitate, wash it, dry it, and then calcinate it at 600°C. A cube-shaped bismuth phosphate photocatalyst was obtained. Depend on figure 2 It can be seen that the prepared bismuth phosphate photocatalyst is cube-shaped, with good dispersion and regular shape.

Embodiment 3

[0018] Dissolve 1 mmol of bismuth nitrate in 50 ml of nitric acid solution with a molar concentration of 1 mol / L, add 2 mmol of EDTA disodium salt, stir well, then add 1 mmol of sodium dihydrogen phosphate to obtain a mixed solution; Add a sodium hydroxide solution with a molar concentration of 0.5 mol / L, adjust the pH of the system to 1, and let it stand at room temperature for 1 hour to obtain a precipitate; centrifuge the precipitate, wash it, dry it, and then calcinate it at 400°C. Pine needle-like bismuth phosphate photocatalyst. Depend on image 3 It can be seen that the prepared bismuth phosphate photocatalyst is pine needle-shaped, with good dispersion and regular shape.

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Abstract

The invention discloses a preparation method for a bismuth phosphate photocatalyst with different microstructures, and belongs to the technical field of photocatalysts. According to the technical scheme, the key point is that the method comprises the steps of (1) dissolving bismuth phosphate into a nitric acid solution with the mole concentration of 0.5-3mol / L, adding EDTA (ethylene diamine tetraacetic acid) disodium salt, uniformly stirring, mixing, and then adding sodium dihydrogen phosphate to obtain a mixed solution I; (2) adding a sodium hydroxide solution with the mole concentration of 0.5-3mol / L into the obtained mixed solution I to obtain a mixed solution II, adjusting the pH of the mixed solution II to be 1, and then stewing the mixed solution II under room temperature for 1-120 hours to obtain precipitates; (3) performing centrifugal separation on the precipitates, washing and drying the precipitates, and sintering under the temperature of 400-600 DEG C to obtain the bismuth phosphate photocatalyst with the different microstructures. The preparation method is simple, feasible and low in cost, an operating process is easy to control, and the prepared bismuth phosphate photocatalyst with the different microstructures is high in photocatalysis activity.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a preparation method of bismuth phosphate photocatalysts with different microscopic shapes. Background technique [0002] As an advanced oxidation technology, photocatalytic degradation of pollutants has great application prospects in environmental remediation and has received more and more attention. The photocatalyst is the core of this technology. Among many semiconductor photocatalysts, TiO 2 Due to its biological inertness, strong oxidation, low cost and high efficiency, resistance to light corrosion and chemical corrosion, and strong stability, it is considered to be the most suitable photocatalyst for environmental pollution control. But TiO 2 There are still some shortcomings that are difficult to overcome, such as low utilization rate of sunlight, high recombination rate of photogenerated holes-electrons, and difficulty in separation and recovery. Therefore, th...

Claims

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Application Information

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IPC IPC(8): B01J27/186B01J35/02C01B25/37
Inventor 邢新艳马玉雪李静丁慧芳樊广燕刘玉民席国喜
Owner HENAN NORMAL UNIV
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