Method for preparing Bi-doped ZnS photocatalyst by taking ionic liquid as template

A technology of ionic liquid and photocatalyst, which is applied in the field of chemistry, can solve the problems of low quantum efficiency, high recombination rate of photogenerated electrons and holes, and weak photocatalytic activity, and achieve increased steric hindrance, good performance, and good dispersion Effect

Inactive Publication Date: 2015-06-03
ANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The problems of most current photocatalysts are: (1) The energy gap is too wide, and it can only respond to the ultraviolet region of less than 5% of solar radiation, and the utilization rate of visible light is very low compared to 47% of solar energy; (2) The valence band and The potential of the conduction band is difficult to meet the potential of completely splitting water at the same time, and sacrificial agents such as Na2S, Na2SO3, KI and organic alcohols are needed to realize the generation of H2 or O2; (3) photogenerated electrons-holes are easy to recombine, and the quantum efficiency is very low
Due to the high recombination rate of photogenerated electrons and holes of CdS alone, the photocatalytic activity is not strong, and a cocatalyst deposited on the surface is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0015] Accurately weigh 0.2000 g of monodisperse ZnS nanospheres in a beaker filled with 5 mL of deionized water at room temperature, ultrasonically disperse it for 3 min, and then add 1.0 mL of C 8 h 15 N 2 BF 4 Ionic liquid, and then add a certain amount of deionized water to the reaction system to obtain a suspension. After ultrasonicating the obtained suspension for 2 min at room temperature, it is transferred to a hydrothermal high-pressure reactor, and the reactor is placed in an oven to make it cool at 160 Constant temperature at ℃ for 12 h. The obtained product was centrifuged and washed three times with deionized water and 95% ethanol, respectively, and then the centrifuged and washed product was placed in a vacuum drying oven at 80 °C for 24 h in vacuum, and after being taken out, it was ground finely, that is, A Bi-doped ZnS nanosphere photocatalyst with a molar ratio of Bi:Zn of 0:100 can be obtained.

Embodiment 2

[0017] Accurately weigh 0.2000 g of monodisperse ZnS nanospheres in a beaker filled with 5 mL of deionized water at room temperature, ultrasonically disperse it for 3 min, and add 0.0005 g of Bi(NO 3 ) 3 , and then dropwise added 1.0 mL of C to the beaker 8 h 15 N 2 BF 4 Ionic liquid, and then add a certain amount of deionized water to the reaction system to obtain a suspension. After ultrasonicating the obtained suspension for 2 min at room temperature, it is transferred to a hydrothermal high-pressure reactor, and the reactor is placed in an oven to make it cool at 160 Constant temperature at ℃ for 12 h. The obtained product was centrifuged and washed three times with deionized water and 95% ethanol, respectively, and then the centrifuged and washed product was placed in a vacuum drying oven at 75 °C for 24 h in vacuum, and after taking it out, it was ground finely, that is, A Bi-doped ZnS nanosphere photocatalyst with a molar ratio of Bi:Zn of 0.25:100 can be obtained....

Embodiment 3

[0019] Accurately weigh 0.2000 g of monodisperse ZnS nanospheres in a beaker filled with 5 mL of deionized water at room temperature, ultrasonically disperse it for 3 min, and add 0.0010 g of Bi(NO 3 ) 3 , and then dropwise added 1.0 mL of C to the beaker 8 h 15 N 2 BF 4 Ionic liquid, and then add a certain amount of deionized water to the reaction system to obtain a suspension. After ultrasonicating the obtained suspension for 2 min at room temperature, it is transferred to a hydrothermal high-pressure reactor, and the reactor is placed in an oven to make it cool at 160 Constant temperature at ℃ for 12 h. The obtained product was centrifuged and washed three times with deionized water and 95% ethanol respectively, and then the product after centrifugation and washing was put into a vacuum drying oven at 85 °C for 26 h in vacuum, and after taking it out, it was ground finely, that is, A Bi-doped ZnS nanosphere photocatalyst with a molar ratio of Bi:Zn of 0.5:100 can be ob...

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Abstract

The invention discloses a method for preparing a Bi-doped ZnS photocatalyst by taking ionic liquid as a template, belonging to the field of chemistry. The method comprises the steps of carrying out ultrasonic dissolution on ZnS, feeding the product into a Bi(NO3)3 water solution, dripping C8H15N2BF4 ionic liquid into the solution to form suspension, dispersing, drying, carrying out centrifugal separation, washing and drying to obtain the Bi-doped ZnS nanosphere photocatalyst. The method is simple in steps and environment-friendly in preparation technology; the product is good in performance.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst, in particular to a method for preparing a Bi-doped ZnS photocatalyst by using an ionic liquid as a template, and belongs to the field of chemistry. Background technique [0002] The problems of most current photocatalysts are: (1) The energy gap is too wide, and it can only respond to the ultraviolet region of less than 5% of solar radiation, and the utilization rate of visible light is very low compared to 47% of solar energy; (2) The valence band and The potential of the conduction band is difficult to meet the potential of completely splitting water at the same time, and sacrificial agents such as Na2S, Na2SO3, KI and organic alcohols are needed to realize the generation of H2 or O2; (3) Photogenerated electrons-holes are easy to recombine, and the quantum efficiency is very low. The various key technical problems mentioned above are the main reasons for restricting photocatalysts. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04
Inventor 杜记民韩玉民杜卫民王志勇魏成振陈惠娟钱永腾
Owner ANYANG NORMAL UNIV
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