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Surface oxygen vacancy ultrathin bismuth oxychloride nanosheet and preparation method thereof

A technology of bismuth oxychloride and surface oxygen, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the problems of inability to form defects on the crystal surface, low utilization rate of visible light, small specific surface area, etc., and achieve low cost and excellent performance Photoelectrochemical activity, mild conditions and controllable effects

Inactive Publication Date: 2018-06-29
GUANGXI UNIV FOR NATITIES
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Problems solved by technology

[0003] Bismuth oxychloride has good photocatalytic performance under ultraviolet light and is a new type of semiconductor photocatalytic material, but BiOCl still has some disadvantages: low utilization rate of visible light and small specific surface area
[0004] At present, through the above methods, only a complete crystal structure can be synthesized, and defects cannot be accurately formed on the crystal surface.

Method used

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  • Surface oxygen vacancy ultrathin bismuth oxychloride nanosheet and preparation method thereof
  • Surface oxygen vacancy ultrathin bismuth oxychloride nanosheet and preparation method thereof
  • Surface oxygen vacancy ultrathin bismuth oxychloride nanosheet and preparation method thereof

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preparation example Construction

[0041] The invention provides a preparation method of ultra-thin bismuth oxychloride nanosheets with oxygen vacancies on the surface, comprising the following steps:

[0042] S1: Take bismuth nitrate pentahydrate, polyvinylpyrrolidone, mannitol, and water, and stir until the solution is clear and transparent;

[0043] S2: Add KCl solution to the mixed solution, and stir to obtain the first mixed system;

[0044] S3: Add triethylamine dropwise to the first mixed system, and stir to obtain the second mixed system;

[0045] S4: heating the second mixed system with water;

[0046] S5: After the second mixed system is cooled, centrifuge, remove the supernatant, and keep the precipitate;

[0047] S6: wash the precipitate with water first, and then with ethanol;

[0048] S7: put the washed precipitate in ethanol and sonicate;

[0049] S8: centrifuging and drying the precipitate to obtain ultrathin bismuth oxychloride nanosheets with oxygen vacancies on the surface.

[0050] As m...

Embodiment 1

[0064] Add 0.4850g Bi(NO 3 ) 3 ·5H 2 0, 0.4000g polyvinylpyrrolidone, 0.4550g mannitol, be dissolved in 25mL deionized water, keep stirring, dissolve to obtain a clear and transparent solution; add 2mL saturated KCl solution dropwise to this mixed liquor solution, stop stirring after dropping 10min; The mixed solution was transferred to a hydrothermal reaction kettle so that the mixed solution reached 80% of the kettle volume, and then the system was hydrothermally treated at 160° C. for 3 hours. After the reaction kettle was cooled to room temperature, centrifuged to obtain a white sample, took the precipitate, washed the precipitate four times with deionized water (centrifuged at 10000rmp / min for 10min with a high-speed centrifuge), and finally dried it with a lyophilizer to obtain a thicker sample. BiOCl slab sample. The TEM image of the prepared BiOCl thick slices can be found in figure 1 .

Embodiment 2

[0066] see figure 2 , add 0.4850g Bi(NO 3 ) 3 ·5H 2 0, 0.4000g polyvinylpyrrolidone, 0.4550g mannitol, be dissolved in 25mL deionized water, keep stirring, dissolve to obtain a clear and transparent solution; add 2mL saturated KCl solution dropwise to this mixed liquor solution, stop stirring after dropping 10min; The mixed solution was transferred to a hydrothermal reaction kettle so that the mixed solution reached 80% of the kettle volume, and then the system was hydrothermally reacted at 160° C. for 3 hours. After the reactor was cooled to room temperature, the obtained white sample was centrifuged and washed with deionized water for four times (centrifuged at a speed of 10000rmp / min for 10min in a high-speed centrifuge). The following intermittent ultrasound 5h. After ultrasonication, centrifuge at a speed of 500rmp / min for 10min in a low-speed centrifuge; take the centrifuge and centrifuge at a speed of 10000rmp / min for 10min in a high-speed centrifuge, and dry the o...

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Abstract

The invention discloses a surface oxygen vacancy ultrathin bismuth oxychloride nanosheet and a preparation method thereof. The preparation method comprises the following steps: selectively adding organic small molecule triethylamine with coordination ability into a system; utilizing a competitive coordination effect of small organic molecules to form surface defects; adjusting parameters of a hydro-thermal synthesis system; centrifuging, performing ultrasound treatment, washing and freeze drying; controlling to synthesize an ultrathin surface oxygen vacancy bismuth oxychloride two-dimensionalnanosheet material. By means of the technical scheme that the competitive coordination effect of the reducing small organic molecules is fully utilized to form the surface defects, the problem that anexisting ultrathin bismuth oxychloride nanosheet preparation method cannot accurately form the surface defects and has rigorous preparation conditions is solved. The method has the characteristics ofsimple production technology, safe production process and wide application to preparing inorganic functional materials.

Description

technical field [0001] The invention relates to the technical field of inorganic functional materials, in particular to an ultra-thin bismuth oxychloride nanosheet with oxygen vacancies on the surface and a preparation method thereof. Background technique [0002] In recent years, bismuth oxychloride (BiOCl) nanomaterials with a layered structure have been favored by the field of photocatalytic materials research because of their photocatalytic activity comparable to or even better than that of P25. Bismuth nanostructured materials were reported to be synthesized. Among them, the bismuth oxychloride material with a two-dimensional nanosheet structure exhibits characteristic photoelectrochemical properties due to its special surface structure, which has aroused extensive research interest of researchers. [0003] Bismuth oxychloride has good photocatalytic performance under ultraviolet light and is a new type of semiconductor photocatalytic material, but BiOCl still has some...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00
CPCC01G29/00C01P2002/72C01P2004/04C01P2004/20
Inventor 米艳张树聪胡飞龙何淑清李跃
Owner GUANGXI UNIV FOR NATITIES
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