Method for preparing photocatalyst for porous pucherite nanosheet modified by ferric oxide

A technology of bismuth vanadate and nanosheets is applied in the field of inorganic nanophotocatalytic materials, which can solve the problems of low catalytic activity and achieve the effects of high photocatalytic activity, high efficiency and high activity

Active Publication Date: 2014-08-06
WENZHOU UNIVERSITY
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Problems solved by technology

[0004] Aiming at the deficiency of low catalytic activity of a single bismuth vanadate photocatalyst, the present invention

Method used

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  • Method for preparing photocatalyst for porous pucherite nanosheet modified by ferric oxide
  • Method for preparing photocatalyst for porous pucherite nanosheet modified by ferric oxide
  • Method for preparing photocatalyst for porous pucherite nanosheet modified by ferric oxide

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Embodiment 1

[0043] Porous BiVO in this embodiment 4 The synthesis process of nanosheets is as follows:

[0044] Weigh 1mmol of bismuth nitrate, dissolve it in 20mL of ethylene glycol, stir to dissolve it, and mark it as solution A; take another 4.25mmol of sodium hydroxide and 2mmol of terephthalic acid and dissolve it in 10mL of water, stir to dissolve it, and mark it as Solution B. Next, add solution B to solution A and let it stand at about 20 degrees Celsius for 4 hours. Add the above-mentioned solution and 0.0732g of sodium metavanadate into the polytetrafluoroethylene liner of the high-pressure reaction kettle, and after stirring the mixed solution for several times, put the reaction kettle into an electric heating constant-temperature blast drying oven after being sealed, and dry it at 180 ℃ for constant temperature reaction for 10 hours. After the reaction is completed and naturally cooled to room temperature, the product is taken out for centrifugation, and after drying, solid...

Embodiment 2

[0047] This embodiment contains Fe 2 o 3 The molar ratio is 2.5% Fe 2 o 3 / BiVO 4 The preparation method of porous nanosheet is as follows:

[0048] Add 0.4mmol of porous bismuth vanadate nanosheets synthesized above, 1mmol of sodium hydroxide, 40mL of water and 0.02mmol of ferric nitrate into the autoclave. In the oven, react at a constant temperature of 160°C for 12h. After the reaction was completed and naturally cooled to room temperature, the product was taken out for centrifugation, and washed several times with absolute ethanol and high-purity water respectively. The product is finally placed in a vacuum drying oven and dried at 60°C for 4 hours to obtain Fe with a molar ratio of iron oxide of 2.5%. 2 o 3 / BiVO 4 porous nanosheets.

[0049] Depend on figure 2 a, transmission electron microscope observation shows that Fe 2 o 3 / BiVO 4 Still maintain a porous nanosheet structure. figure 2 High-resolution analysis of the rectangular area in a shows that the...

Embodiment 3

[0051] Contains different molar proportions of Fe 2 o 3 Fe 2 o 3 / BiVO 4 The preparation method of porous nanosheet composite photocatalyst is as follows:

[0052] The difference between this embodiment and the second embodiment is that different proportions of ferric nitrate (0.008-0.04 mmol) are respectively added to the reaction system, and other operating procedures remain unchanged.

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Abstract

The invention discloses a method for preparing a compound photocatalyst for modified porous pucherite nanosheet, and belongs to the field of inorganic nano photocatalytic materials. The degradation rate of the porous pucherite nanosheet loaded with ferric oxide to rhodamine B can reach 99% in 90 minutes under the irradiation of visible light, and the degradation rate is 27 times higher than the porous pucherite nanosheet not modified by the ferric oxide. The compound photocatalyst can effectively degrade colorless organic pollutant such as phenol. Under the irradiation of visible light, the removal rate to phenol in 2 hours can reach more than 96%, and the degradation rate is 31 times higher than the porous pucherite nanosheet not modified by the ferric oxide. According to the invention, the prepared compound photocatalyst not only can perform efficient photocatalytic degradation on poisonous and harmful chemical substances under the irradiation of visible light, but also can conveniently perform precipitation separation recycle in a liquid phase reaction, the preparation method is simple, the material cost is low, and good application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of inorganic nano photocatalytic materials, in particular to a preparation method of porous bismuth vanadate nano sheet photocatalyst modified by iron oxide. Background technique [0002] Environmental pollution is an important issue restricting the sustainable development of human society today. At present, the advanced pollution treatment technologies that have been extensively studied include coagulation sedimentation, adsorption and biodegradation. However, these traditional technologies only transfer, enrich, and partially degrade organic pollutants, and cannot fundamentally and completely degrade toxic pollutants. At the same time, these technologies also have disadvantages such as high cost, low efficiency, and narrow scope of application. Therefore, the development of high-efficiency, low-cost, and wide-ranging pollution treatment technologies and chemical pollutant removal technologies with deep o...

Claims

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Application Information

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IPC IPC(8): B01J23/847B82Y30/00B82Y40/00A62D3/17A62D101/26A62D101/28
Inventor 周淑美马德琨蔡平黄少铭
Owner WENZHOU UNIVERSITY
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