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Defect-rich ultra-thin bismuth oxyiodide nano-sheet preparation method

A technology of bismuth iodide and nanosheets is applied in the field of preparation of ultra-thin bismuth iodide nanosheets and achieves the effects of increased photocatalytic activity, good light absorption efficiency and high photocatalytic activity

Inactive Publication Date: 2016-04-06
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the current experimental research results also show that defects and internal electric fields are the core to improve the photon absorption efficiency and carrier separation efficiency of BiOI itself.
However, there is no report on the in situ preparation of defect-rich ultrathin bismuth oxyiodide nanosheets

Method used

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Experimental program
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Effect test

Embodiment 1

[0021] Weigh 3.61g of bismuth nitrate pentahydrate and dissolve in 40mL of ethylene glycol, weigh 1.66g of potassium iodide and dissolve in 40mL of ethylene glycol, mix the two slowly, then add 1mL of benzaldehyde, and stir magnetically for 1h. The mixed solution was transferred to a hydrothermal reactor, and reacted for 18h at 160°C. After the reaction is completed, the hydrothermal reaction kettle is cooled to room temperature, and then the olive-green product in the hydrothermal reaction kettle is washed three times with ethanol and deionized water respectively, and dried. The obtained defect-rich ultrathin bismuth oxyiodide nanosheets exhibit high photocatalytic activity.

Embodiment 2

[0023] Weigh 3.61g of bismuth nitrate pentahydrate and dissolve in 40mL of ethylene glycol, weigh 1.66g of sodium iodide and dissolve in 40mL of ethylene glycol, mix the two slowly, then add 20mg of glucose, and stir magnetically for 1h. The mixed solution was transferred to a hydrothermal reactor, and reacted for 18h at 160°C. After the reaction is completed, the hydrothermal reaction kettle is cooled to room temperature, and then the olive-green product in the hydrothermal reaction kettle is washed three times with ethanol and deionized water respectively, and dried. The obtained defect-rich ultrathin bismuth oxyiodide nanosheets exhibit high photocatalytic activity.

Embodiment 3

[0025] Weigh 3.61g of bismuth nitrate pentahydrate and dissolve in 40mL of ethylene glycol, weigh 1.66g of potassium iodide and dissolve in 40mL of ethylene glycol, mix the two slowly, then add 1mL of benzaldehyde, and stir magnetically for 1h. The mixed solution was transferred to a hydrothermal reactor, and reacted for 24h at 140°C. After the reaction is completed, the hydrothermal reaction kettle is cooled to room temperature, and then the olive-green product in the hydrothermal reaction kettle is washed three times with ethanol and deionized water respectively, and dried. The obtained defect-rich ultrathin bismuth oxyiodide nanosheets exhibit high photocatalytic activity.

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Abstract

The present invention discloses a defect-rich ultra-thin bismuth oxyiodide nano-sheet preparation method, which comprises: uniformly mixing a bismuth nitrate pentahydrate ethylene glycol solution and a potassium iodide ethylene glycol solution according to a volume ratio of 1:1; adding a small amount of an organic aldehyde reagent to make the organic aldehyde reagent concentration in the mixed solution be 0.2-1 g / L; transferring into to a hydrothermal reaction kettle, and carrying out a heat treatment for 12-24 h at a temperature of 150-180 DEG C; and after the hydrothermal reaction kettle is cooled to a room temperature, carrying out alcohol washing on the olive green product of the hydrothermal reaction kettle, carrying out water washing, and drying to obtain the product. According to the present invention, the viscosity of the ethylene glycol is high, the bismuth nitrate pentahydrate and the potassium iodide react in the high viscosity ethylene glycol system, and the grain growth is slow, such that the generation of the ultra-thin bismuth oxyiodide nano-sheets is easily achieved; and the organic aldehyde has the effects of the usual alcohol solvents and further normally has a certain reduction property, such that the [Bi2O2]<2+> unit on the surface is easily reduced through the organic aldehyde after the bismuth oxyiodide nano-sheets are subjected to ultra thinning so as to cause a lot of defects.

Description

technical field [0001] The invention relates to the technical field of preparation methods of new chemical materials, in particular to a preparation method of defect-rich ultrathin bismuth oxyiodide nanosheets. Background technique [0002] Semiconductor photocatalysis technology has been widely applied to the two major areas of national economy and people's livelihood, environment and energy, so it is urgent to prepare efficient sunlight-driven photo-semiconductor catalysts. Photon absorption efficiency and carrier separation efficiency are the two core issues facing semiconductor photocatalysts, and many researches on photocatalyst modification are also carried out around these two points. For example: doping, dye sensitization, and surface plasmon resonance effects are to improve the photon absorption efficiency of photocatalysts; the use of co-catalysts is to improve carrier separation efficiency; carbon material modification and composite photocatalyst construction can ...

Claims

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Application Information

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IPC IPC(8): C01G29/00B82Y40/00B82Y30/00
Inventor 叶立群谢海泉王丽金晓丽
Owner NANYANG NORMAL UNIV
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