Preparation method and application method of titanium dioxide nanosheet supported MIL-100 (Fe) composite photocatalysis material

Abstract

The invention relates to a preparation method and application method of a titanium dioxide nanosheet supported MIL-100 (Fe) composite photocatalysis material, belongs to the field of titanium dioxide photocatalysis, and especially relates to the field of titanium dioxide nanosheet supported porous metal organic skeleton (MOFs) composite materials. The preparation method comprises the following steps: 1, uniformly stirring tetrabutyl titanate and hydrofluoric acid at normal temperature, putting the obtained mixture in a hydrothermal reaction kettle, carrying out a reaction, separating the obtained material, washing the separated material, and drying the washed material to obtain titanium dioxide nanosheets; and 2, uniformly dispersing the titanium dioxide nanosheets in an anhydrous ethanol solution of iron trichloride, carrying out magnetic stirring at normal temperature for 15 min, carrying out suction filtration separation to obtain a product, dispersing the product in an anhydrous ethanol solution of trimesic acid, carrying out a 50-80 DEG C water bath reaction for 20-50 min, carrying out suction filtration separation to obtain a product, and repeating above processes in step 2 2-50 times to obtain the titanium dioxide nanosheet supported MIL-100 (Fe) composite photocatalysis material. The catalyst prepared through the method is especially suitable for catalytic degradation of high-concentration organic dyes (such as methylene blue) under visible light irritation) to reach a very high degradation rate.

Description

technical field

[0001] The invention relates to the field of titanium dioxide photocatalysis, in particular to the field of titanium dioxide nanosheet-loaded porous metal-organic framework (MOFs) composite materials. The catalyst prepared by the method is particularly suitable for catalytically degrading high-concentration organic dyes (such as methylene blue) under visible light irradiation, and achieves a high degradation rate. Background technique

[0002] At present, titanium dioxide photocatalyst has attracted extensive attention of researchers at home and abroad due to its advantages of stability, non-toxicity and low price, and has broad application prospects in wastewater treatment, air purification, antibacterial and deodorizing, self-cleaning and other fields. Anatase-phase single-crystal titanium dioxide nanosheets have a higher proportion of high-energy active surfaces (001), which can more effectively promote the catalytic reaction, and thus have received great ...

Examples

Embodiment 1

[0026] (1) Add 5ml of hydrofluoric acid with a mass fraction of 40% to 25ml of tetrabutyl titanate, stir evenly at 25°C, put it into a 100ml autoclave, and react at 200°C for 20h. After the reaction is finished, it is washed to neutrality with deionized water and ethanol, and dried to obtain titanium dioxide nanosheet powder.

[0027] (2) Weigh 0.027g of ferric trichloride hexahydrate and dissolve it in 10m of ethanol, ultrasonically dissolve it fully, and then disperse 0.10g of prepared titanium dioxide nanosheets into the above solution, after ultrasonic dispersion is uniform, magnetic force at room temperature After stirring for 15min, the Fe 3+Adsorbed titanium dioxide nanosheets; weigh 0.021g trimesic acid and dissolve it in 10m ethanol, and ultrasonically dissolve it fully, and the adsorbed Fe 3+ The titanium dioxide nanosheets were dispersed into the ethanol solution of trimesic acid, dispersed evenly, placed in a water bath at 70°C for 30 minutes, and then separated b...

Embodiment 2

[0032] The preparation method of the MIL-100 (Fe) loaded titanium dioxide nanosheet composite catalyst, the steps are the same as in Example 1, the difference is: the titanium dioxide nanosheets are coated with MIL-100 (Fe) 5 times

[0033] Weigh 20 mg of the above-prepared MIL-100(Fe)-loaded titanium dioxide nanosheet catalyst to carry out the experiment of visible light catalytic degradation of high concentration methylene blue, the concentration of methylene blue is 50 mg L -1 , the degradation rate of methylene blue was 71.5% after visible light irradiation for 80min.

Embodiment 3

[0035] The preparation method of MIL-100 (Fe) loaded titanium dioxide nanosheet composite catalyst, the steps are the same as in Example 1, the difference is: titanium dioxide nanosheets are coated MIL-100 (Fe) 10 times

[0036] Weigh 20 mg of the above-prepared MIL-100(Fe)-loaded titanium dioxide nanosheet catalyst to carry out the experiment of visible light catalytic degradation of high concentration methylene blue, the concentration of methylene blue is 50 mg L -1 , the degradation rate of methylene blue was 84.2% after visible light irradiation for 80min.

technical field

[0001] The invention relates to the field of titanium dioxide photocatalysis, in particular to the field of titanium dioxide nanosheet-loaded porous metal-organic framework (MOFs) composite materials. The catalyst prepared by the method is particularly suitable for catalytically degrading high-concentration organic dyes (such as methylene blue) under visible light irradiation, and achieves a high degradation rate. Background technique

[0002] At present, titanium dioxide photocatalyst has attracted extensive attention of researchers at home and abroad due to its advantages of stability, non-toxicity and low price, and has broad application prospects in wastewater treatment, air purification, antibacterial and deodorizing, self-cleaning and other fields. Anatase-phase single-crystal titanium dioxide nanosheets have a higher proportion of high-energy active surfaces (001), which can more effectively promote the catalytic reaction, and thus have received great ...

Examples

Embodiment 1

[0026] (1) Add 5ml of hydrofluoric acid with a mass fraction of 40% to 25ml of tetrabutyl titanate, stir evenly at 25°C, put it into a 100ml autoclave, and react at 200°C for 20h. After the reaction is finished, it is washed to neutrality with deionized water and ethanol, and dried to obtain titanium dioxide nanosheet powder.

[0027] (2) Weigh 0.027g of ferric trichloride hexahydrate and dissolve it in 10m of ethanol, ultrasonically dissolve it fully, and then disperse 0.10g of prepared titanium dioxide nanosheets into the above solution, after ultrasonic dispersion is uniform, magnetic force at room temperature After stirring for 15min, the Fe 3+Adsorbed titanium dioxide nanosheets; weigh 0.021g trimesic acid and dissolve it in 10m ethanol, and ultrasonically dissolve it fully, and the adsorbed Fe 3+ The titanium dioxide nanosheets were dispersed into the ethanol solution of trimesic acid, dispersed evenly, placed in a water bath at 70°C for 30 minutes, and then separated b...

Embodiment 2

[0032] The preparation method of the MIL-100 (Fe) loaded titanium dioxide nanosheet composite catalyst, the steps are the same as in Example 1, the difference is: the titanium dioxide nanosheets are coated with MIL-100 (Fe) 5 times

[0033] Weigh 20 mg of the above-prepared MIL-100(Fe)-loaded titanium dioxide nanosheet catalyst to carry out the experiment of visible light catalytic degradation of high concentration methylene blue, the concentration of methylene blue is 50 mg L -1 , the degradation rate of methylene blue was 71.5% after visible light irradiation for 80min.

Embodiment 3

[0035] The preparation method of MIL-100 (Fe) loaded titanium dioxide nanosheet composite catalyst, the steps are the same as in Example 1, the difference is: titanium dioxide nanosheets are coated MIL-100 (Fe) 10 times

[0036] Weigh 20 mg of the above-prepared MIL-100(Fe)-loaded titanium dioxide nanosheet catalyst to carry out the experiment of visible light catalytic degradation of high concentration methylene blue, the concentration of methylene blue is 50 mg L -1 , the degradation rate of methylene blue was 84.2% after visible light irradiation for 80min.

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