Method for preparing bismuth-base oxide nanosheet and application of bismuth-base oxide nanosheet

A technology of nanosheets and oxides, applied in the field of materials, can solve the problems of inability to fundamentally degrade formaldehyde, long formaldehyde release cycle, and inability to degrade formaldehyde, and achieve easy control of process parameters, high catalytic decomposition ability, high surface potential and The effect of electrostatic potential energy

Active Publication Date: 2018-06-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these three methods have their own limitations
The commonly used air ventilation method relies on air circulation to remove indoor formaldehyde. However, the release cycle of formaldehyde is long, generally reaching 3-15 years. It is obviously unrealistic to remove formaldehyde only by ventilation.
The activated carbon treatment method is to adsorb and remove formaldehyde through the adsorption effect of pores and small pores, but whether it is activated carbon itself or the modified activated carbon on the market, it can only absorb formaldehyde, and it cannot fundamentally degrade formaldehyde. In addition, due to It can only absorb and needs to be replaced regularly. If it is not replaced in time, changes in the surrounding environment, such as temperature rise, may lead to the desorption of formaldehyde
For photocatalysts, the commonly used material is TiO 2 , however TiO 2 It can only absorb and utilize energy in the ultraviolet region. Under normal circumstances, no matter whether it is a living room or an office place, it cannot get sufficient light to excite the photocatalyst; in addition, common environmental factors such as moisture will cause the material to fail.
To sum up, the current methods for dealing with formaldehyde cannot simply and effectively degrade formaldehyde

Method used

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  • Method for preparing bismuth-base oxide nanosheet and application of bismuth-base oxide nanosheet

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Experimental program
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Effect test

Embodiment 1

[0076] Weigh 2.4g bismuth nitrate and mix with 60ml deionized water, stir for 10 minutes, add 2.6g copper nitrate powder, stir for 10 minutes until the solution turns blue; add 1.6g NaOH to the blue solution and stir until flocculation, then continue stirring for 10 minutes ; Add 1 g of thiourea and 0.16 g of CTAB to the flocculent mixture, and stir for 10 minutes to obtain a brown solution; put the solution into a hydrothermal kettle, heat it to 160 ° C, keep it warm for 12 hours, and repeatedly wash and dry it three times to obtain BiCuSO Nanosheets.

[0077] in, figure 1 and figure 2 The SEM and TEM images of the prepared BiCuSO nanosheets are respectively, and the XRD images of the BiCuSO nanosheets are shown in image 3 shown, from figure 1 and figure 2 It can be seen that the prepared BiCuSO has a nanosheet structure.

Embodiment 2

[0079] Weigh 2.46g bismuth oxide and mix with 60ml deionized water, stir for 10 minutes, add 2.6g copper nitrate powder, stir for 10 minutes until the solution turns blue; add 1.6g NaOH to the blue solution and stir until flocculation, then continue stirring for 10 minutes ; Add 1 g of thiourea and 0.16 g of CTAB to the flocculent mixture, and stir for 10 minutes to obtain a brown solution; put the solution into a hydrothermal kettle, heat it to 160 ° C, keep it warm for 12 hours, and repeatedly wash and dry it three times to obtain BiCuSO Nanosheets. Among them, the XRD pattern of BiCuSO nanosheets is as follows image 3 shown.

Embodiment 3

[0081] The BiCuSO / Au composite was prepared by using the BiCuSO nanosheets prepared in Example 1.

[0082] Mix 0.2g of BiCuSO nanosheets with 0.05g of gold tetrachloride powder and stir for 10 minutes, add 50Ml deionized water to the mixture, continue stirring for 10 minutes, then add NaOH to adjust the pH value to 9, and place the mixed solution on Irradiated and stirred under the visible light of a xenon lamp for 12 hours; the obtained solution was centrifuged, washed and dried three times repeatedly, and the BiCuSO / Au composite was obtained.

[0083] in, Figure 4 The formaldehyde catalytic degradation performance diagram of the prepared BiCuSO / Au composite under visible light irradiation, from Figure 4 It can be seen that the BiCuSO / Au composite can effectively catalyze the degradation of formaldehyde under visible light irradiation, and the catalytic degradation of formaldehyde degradation can reach more than 75% under visible light irradiation for 40 minutes.

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Abstract

The invention discloses a method for preparing a bismuth-base oxide nanosheet and application of the bismuth-base oxide nanosheet. The method for preparing the bismuth-base oxide nanosheet comprises the following steps: (1) mixing bismuth oxide and/or bismuth nitrate, cupric nitrate and water so as to obtain a blue solution; (2) adding sodium hydroxide into the blue solution, and stirring to obtain a flocculence mixture; (3) adding thiourea and CTAB (Cetyltrimethyl Ammonium Bromide) surfactant into the flocculence mixture in sequence, keeping the temperature at 20-160 DEG C for 12h, filtering,cleaning and drying to obtain a BiCuSo nanosheet. When the method is adopted, the BiCuSo nanosheet with a laminated structure can be effectively prepared, and in addition, the prepared BiCuSo nanosheet can have higher catalytic decomposition ability for formaldehyde in a visible area.

Description

technical field [0001] The invention belongs to the field of materials, in particular, the invention relates to a method for preparing bismuth-based oxide nanosheets and applications of bismuth-based oxide nanosheets. Background technique [0002] Formaldehyde has gradually become the main killer of people's health in today's society. A large amount of formaldehyde will inevitably remain in the bedroom or office after decoration, and this type of formaldehyde is released slowly over a long period of time and cannot be eliminated directly in a quick and short period of time. It is no exaggeration to call it the invisible killer of human health in the 21st century. The research results show that when people are exposed to low-dose formaldehyde for a long time, the hazards include: causing chronic respiratory diseases, nasopharyngeal cancer, colon cancer, brain tumor, menstrual disorders, gene mutations in the nucleus, cross-linking in DNA single strands, and cross-linking bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B01J27/02B22F9/24B22F1/00B82Y40/00D04H1/728D04H1/4318
CPCD04H1/4318D04H1/728B82Y40/00C01G29/006B01J27/02B01J35/0013B01J35/004B22F9/24C01P2002/72C01P2004/04C01P2004/03C01P2004/24B22F1/068B22F1/054
Inventor 林元华罗屹东王焕春乔丽娜南策文沈洋
Owner TSINGHUA UNIV
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