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Core-shell structure nanoflower/nanoparticle bismuth oxybromide/titanium dioxide visible-light-driven photocatalyst and preparation method and application thereof

A technology of bismuth oxybromide and titanium dioxide, which is applied in the field of nanomaterials and visible light catalytic materials and their preparation, and can solve problems affecting the utilization of sunlight

Pending Publication Date: 2021-08-24
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The intrinsic bandgap width of titanium dioxide semiconductor is about 3.2eV. Therefore, the maximum wavelength for excited electrons to transition from the valence band to the conduction band is 387.5nm, which can only be excited by ultraviolet light, which greatly affects the utilization of sunlight by titanium dioxide.

Method used

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  • Core-shell structure nanoflower/nanoparticle bismuth oxybromide/titanium dioxide visible-light-driven photocatalyst and preparation method and application thereof
  • Core-shell structure nanoflower/nanoparticle bismuth oxybromide/titanium dioxide visible-light-driven photocatalyst and preparation method and application thereof
  • Core-shell structure nanoflower/nanoparticle bismuth oxybromide/titanium dioxide visible-light-driven photocatalyst and preparation method and application thereof

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Experimental program
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Embodiment 1

[0024] First, weigh 0.97 grams of bismuth nitrate pentahydrate, and fully dissolve it in 40 milliliters of 2-methoxyethanol solvent by magnetic stirring to obtain solution A; weigh 1.16 grams of 1-hexadecyl-3-methylimidazole- Ammonium bromide ([C 16 Mim] Br), fully dissolved into 40 ml of 2-methoxyethanol solvent by magnetic stirring to obtain solution B; drop solution A into solution B, and mix evenly by magnetic stirring. The mixed solution was reacted at 120°C for 12 hours to obtain a pale yellow bismuth oxybromide precipitate, which was centrifuged and washed 3 times with deionized water and freeze-dried to obtain a light yellow bismuth oxybromide powder; secondly, a certain amount Titanium sulfate, glucose and the synthesized bismuth oxybromide powder and deionized water were thoroughly mixed by magnetic stirring, and reacted at 180°C for 12 hours to obtain a yellow-white precipitate, which was centrifugally washed with deionized water for 3 The second step is to obtain ...

Embodiment 2

[0029] Catalytic performance evaluation of the nanoflower / nanoparticle bismuth oxybromide / titanium dioxide visible light catalyst with core-shell structure prepared by the method of the present invention

[0030] The nanoflower / nanoparticle bismuth oxybromide / titanium dioxide catalyst with a core-shell structure prepared by the method of the present invention degrades caramel pigment in molasses wastewater under visible light irradiation, the dosage of the catalyst is 25 mg, and the concentration of caramel pigment is 200 mg / L , the volume is 50 ml, the light source adopts 300W halogen tungsten lamp, the filter is placed between the light source and the degradation solution, so that the incident light is visible light (420nm≤λ≤800nm), and the UV-3600 ultraviolet-visible spectrophotometer is used for measurement Changes in absorbance (concentration) of rhodamine B. Take 5mL samples every 1 hour, and after centrifugation, take the supernatant to measure the absorbance of rhodami...

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Abstract

The invention provides a micron core-shell structure titanium dioxide-bismuth oxybromide visible-light-driven photocatalyst and a preparation method and application thereof. Titanium dioxide-bismuth oxybromide with a nano core-shell structure is prepared by adopting an ionic liquid-hydrothermal two-step method, the core diameter of bismuth oxybromide is 250nm, and the shell thickness of bismuth tungstate is 30-50nm. The preparation method comprises the following steps: applying an ionic liquid-hydrothermal two-step method and taking 2-methoxyethanol as a solvent, reacting bismuth nitrate pentahydrate with 1-hexadecyl-3-methylimidazole-ammonium bromide to generate nano bismuth oxybromide microspheres; adding titanium sulfate and glucose, loading titanium dioxide on the surfaces of the bismuth oxybromide microspheres to obtain a titanium dioxide-bismuth oxybromide precipitate, and washing and drying the precipitate to obtain the titanium dioxide-bismuth oxybromide visible-light-driven photocatalyst with the nano core-shell structure, which can be used for degrading organic pollutants under the condition of visible light. The preparation method is simple, easy to operate and beneficial to wide application of production practice.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and visible light catalytic materials and preparation methods thereof, and in particular relates to a core-shell structured nanoflower / nanoparticle bismuth oxybromide / titanium dioxide visible light catalyst and its preparation method and application. Background technique [0002] Semiconductor photocatalytic materials are widely used in the fields of environmental pollution control and energy conversion, such as pollutant degradation, hydrogen production, anti-corrosion, and dye-sensitized solar cells. The intrinsic bandgap width of titanium dioxide semiconductor is about 3.2eV. Therefore, the maximum wavelength for excited electrons to transition from the valence band to the conduction band is 387.5nm, which can only be excited by ultraviolet light, which greatly affects the utilization of sunlight by titanium dioxide. . [0003] Studies have shown that the g-C 3 N 4 , ZnO, Fe 3 o 4 、 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J21/06B01J37/03B01J37/08B01J37/10B82Y30/00B82Y40/00C02F1/30C02F101/30
CPCB01J27/06B01J21/063B01J37/031B01J37/08B01J37/10B82Y30/00B82Y40/00C02F1/30C02F2101/30C02F2101/308C02F2305/10B01J35/397B01J35/39B01J35/23
Inventor 何金云刘雨琳张素芳龙飞王燕舞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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