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Biomimetic synthesis method of size-controllable prismatic bismuth phosphate photo-catalyst

A photocatalyst and biomimetic synthesis technology, applied in the field of photocatalytic materials, can solve the problems of increased preparation cost, BiPO4 shape and size difficulties, etc., and achieve the effect of low cost

Inactive Publication Date: 2014-11-19
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While the usual BiPO 4 The preparation methods include co-precipitation method, hydrothermal method and solid phase method, etc. These conventional methods are very useful for controlling BiPO 4 The shape and size of the
The solvothermal method or the commonly used organic induction method can prepare photocatalysts with a certain shape, but because the process uses organic solvents or organic reagents, it increases the preparation cost and brings pressure to the environment. Therefore, it is necessary to find a simple and easy-to-operate The synthesis method of bismuth phosphate photocatalyst which is environmentally friendly and has controllable shape and size is of great significance

Method used

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  • Biomimetic synthesis method of size-controllable prismatic bismuth phosphate photo-catalyst
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  • Biomimetic synthesis method of size-controllable prismatic bismuth phosphate photo-catalyst

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Experimental program
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Effect test

Embodiment 1

[0010] Dissolve 3 parts of 1.455g (3mmol) bismuth nitrate pentahydrate in 3 parts of nitric acid solution with a molar concentration of 1mol / L respectively, after stirring evenly, add 0.15g, 0.75g and 1.5g of gelatin respectively, and continue stirring for 2h to obtain 3 parts of mixed solution; add 0.468g (3mmol) sodium dihydrogen phosphate to the above 3 parts of mixed solution, stir for 0.5h, then adjust the pH value of the system to 1 with ammonia water, continue stirring for 0.5h, and transfer to the hydrothermal reaction kettle After hydrothermal reaction at 180°C for 24h, centrifugal separation, washing, and vacuum drying at 60°C for 12h, the prismatic bismuth phosphate photocatalysts 1, 2, and 3 were prepared. Among them, the length of prismatic bismuth phosphate photocatalyst 1 is 1.81 μm, the diameter is 0.44 μm, and the aspect ratio is 4.11; The bismuth photocatalyst 3 has a length of 1.2 μm, a diameter of 1.0 μm, and an aspect ratio of 1.18. Under other conditions...

Embodiment 2

[0012] Dissolve 3 parts of 1.455g (3mmol) bismuth nitrate pentahydrate in 3 parts of nitric acid solution with a molar concentration of 1mol / L respectively, after stirring evenly, add 0.15g of gelatin respectively, and continue stirring for 2h to obtain 3 parts of mixed solutions; Add 0.468g (3mmol) sodium dihydrogen phosphate to the 3 mixed solutions, stir for 0.5h, then use ammonia water to adjust the pH value of the system to 1, 4, 7 respectively, continue stirring for 0.5h, transfer to the hydrothermal reaction kettle at 180 After hydrothermal reaction at ℃ for 24 hours, centrifugal separation, washing, and vacuum drying at 60 ℃ for 12 hours, the prismatic bismuth phosphate photocatalysts 4, 5, 6 were obtained. Among them, the length of prismatic bismuth phosphate photocatalyst 4 is 1.81 μm, the diameter is 0.44 μm, and the aspect ratio is 4.11; Bismuth photocatalyst 6 has a length of 2.69 μm, a diameter of 1.8 μm, and an aspect ratio of 1.49. Under other conditions being...

Embodiment 3

[0014] Dissolve 3 parts of 1.455g (3mmol) bismuth nitrate pentahydrate in 3 parts of nitric acid solution with a molar concentration of 1mol / L respectively, after stirring evenly, add 0.15g of gelatin respectively, and continue stirring for 2h to obtain 3 parts of mixed solutions; Add 0.468g (3mmol) sodium dihydrogen phosphate to the 3 mixed solutions, stir for 0.5h, then adjust the pH value of the system to 1 with ammonia water, continue stirring for 0.5h, transfer to the hydrothermal reaction kettle at 140°C, 180°C After hydrothermal reaction at 210°C for 24 hours, centrifugal separation, washing, and vacuum drying at 60°C for 12 hours, the prismatic bismuth phosphate photocatalysts 7, 8, and 9 were prepared. Among them, the length of the prismatic bismuth phosphate photocatalyst 7 is 1.32 μm, the diameter is 0.40 μm, and the aspect ratio is 3.3; Bismuth photocatalyst 9 has a length of 1.19 μm, a diameter of 0.38 μm, and an aspect ratio of 3.13. Under other conditions b...

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Abstract

The invention discloses a biomimetic synthesis method of a size-controllable prismatic bismuth phosphate photo-catalyst. The biomimetic synthesis method comprises the following steps: (1) dissolving bismuth nitrate pentahydrate into a nitric acid solution of which the molar concentration is 1mol / L, uniformly stirring, adding gelatin, and continuously stirring for 2 hours to obtain a mixed solution; (2) adding sodium dihydrogen phosphate of which the molar quantity is equal to that of bismuth nitrate pentahydrate into the mixed solution obtained in the step (1), stirring for 0.5 hour, regulating the pH value of the system to be 1-7 by using ammonia water, continuously stirring for 0.5 hour, transferring to a hydrothermal reaction kettle, performing hydrothermal reaction for 6-24 hours at 140-210 DEG C, performing centrifugal separation, washing, and performing vacuum drying for 12 hours at 60 DEG C to prepare the prismatic bismuth phosphate photo-catalyst. The biomimetic synthesis method disclosed by the invention can avoid the synthesis in an organic solvent or a mixed solvent of an organic reagent and water, and also can avoid regulating the sizes of particles by using the organic solvent which is harmful to the environment, so that the biomimetic synthesis method is a synthetic method which is low in cost and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a biomimetic synthesis method of a size-controllable prismatic bismuth phosphate photocatalyst. 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. Photocatalysts are at the heart 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37B01J27/186C02F1/32
Inventor 邢新艳李静杨林马玉雪丁慧芳樊广燕席国喜
Owner HENAN NORMAL UNIV
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