Novel nano-composite visible light catalyst and preparation method thereof

A nanocomposite, visible light technology, applied in the field of photocatalytic materials, can solve the problems of uncontrollable tin tungsten oxide particle size, decreased photocatalytic activity, and decreased specific surface area, so as to improve catalyst activity, reduce recombination rate, and promote separation. Effect

Inactive Publication Date: 2013-05-22
湖南元素密码石墨烯高科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

However, the particle size of tin-tungsten oxide prepared by solvothermal method is uncontrollable and easy to agglo...
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Abstract

The invention relates to a novel nano-composite visible light catalyst and a preparation method thereof, and belongs to the fields of nano-composite materials and light catalysis. The visible light catalyst is formed by compounding porous graphene and stannum tungsten oxide, wherein a nano-stannum tungsten oxide is deposited on a porous graphene sheet layer; the particle diameter of the nano-stannum tungsten oxide is from 20 to 160 nm; the specific surface area of the porous graphene is from 350 to 450 m<2>/g; the conductivity of the porous graphene is from 20 to 60 S.m(-1); and the weight loss of the porous graphene within the temperature of 900 DEG C is from 4 to 6 wt%. The nano-composite material has the strong absorbance in a region with the wave length of 400 to 800 nm, wherein the absorbance is from 0.92 to 1.08. Therefore, under the irradiation of the visible light, by irradiating the visible light catalyst for 90 minutes, the degradation rate of a methyl orange dye can reach 99.9%.

Application Domain

Water/sewage treatment by irradiationEnergy based wastewater treatment +1

Technology Topic

Methyl orangePhoto catalysis +11

Image

  • Novel nano-composite visible light catalyst and preparation method thereof
  • Novel nano-composite visible light catalyst and preparation method thereof
  • Novel nano-composite visible light catalyst and preparation method thereof

Examples

  • Experimental program(6)

Example Embodiment

[0024] Example 1
[0025] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 5 g of NaOH, grind it uniformly, and then place it in a tube furnace and heat it at 760 °C for 1 h under a nitrogen atmosphere with a programmed heating rate of 5 °C/min to obtain Porous graphene; the specific surface area of ​​porous graphene is 350 m 2 /g; its conductivity is 60 S m -1; The weight loss at 900 °C is 4 wt%.
[0026] 22.6 mg of SnCl 2 ·2H 2 O and 33 mg of Na 2 WO 4 ·2H 2 O solid (weighed according to the substance ratio of 1:1) was successively added to 50 mL of deionized water, then 1 mg of anhydrous sodium acetate and 1 mg of ethylene glycol were added, and the precursor was obtained by magnetic stirring for 30 min.
[0027] The precursor was transferred into a reaction tank, placed in a stainless steel reaction kettle, added with 1 g of porous graphene, sealed and placed in an oven to react at 170 °C for 6 h. After the reaction, it was cooled to room temperature to obtain a yellow-black precipitate. The precipitates were filtered and placed in an oven to dry at 70 °C for 4 h, and then finely ground to obtain porous graphene-tin tungsten oxide nanocomposite visible light catalysts. Its composition is [porous graphene] 100 [SnWO 4 ] 36.7.
[0028] figure 1 TEM transmission electron microscope image of the porous graphene-tin tungsten oxide nanocomposite visible light catalyst prepared for this example, it can be seen that sheet-like graphene with holes and a large number of tin tungsten oxide nanoparticles with regular morphology are deposited on the graphene It is proved that the prepared graphene is porous graphene, the particle size of nano-tin tungsten oxide is between 20 and 160 nm, and the composite effect of porous graphene and tin-tungsten oxide nanomaterials is good.
[0029] figure 2 For the XRD pattern of the porous graphene-tin tungsten oxide nanocomposite visible light catalyst prepared in this example, all the diffraction peaks in the figure are consistent with the phase of the tin tungsten oxide, and the main peak at about 26 degrees is of the porous graphene. Diffraction peaks.
[0030] image 3 The ultraviolet-visible absorption spectrum of the porous graphene-tin tungsten oxide nanocomposite visible light catalyst prepared for this example, we can see from the figure that after the porous graphene and tin tungsten oxide are effectively combined, the porous graphene- The tin-tungsten oxide nanocomposites have strong absorption in the wavelength range of 400-800 nm, with absorbances ranging from 0.92 to 1.08.
[0031]

Example Embodiment

[0032] Example 2
[0033] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 4 g of KOH, grind it uniformly, and then place it in a tube furnace and heat it at 760 °C for 1 h under a nitrogen protective atmosphere with a programmed heating rate of 5 °C/min to obtain Porous graphene; the specific surface area of ​​porous graphene is 370 m 2 /g; its conductivity is 50 S m -1; The weight loss at 900 °C is 4.5 wt%.
[0034] 22.6 mg of SnCl 2 ·2H 2 O and 33 mg of Na 2 WO 4 ·2H 2 O solid (weighed according to the mass ratio of 1:1) was successively added to 75 mL of deionized water, then 1.5 mg of anhydrous sodium acetate and 3 mg of ethylene glycol were added, and the precursor was obtained by magnetic stirring for 30 min.
[0035] The precursor was transferred into a reaction tank, placed in a stainless steel reaction kettle, added with 1.5 g of porous graphene, sealed and placed in an oven to react at 180 °C for 7 h. After the reaction, it was cooled to room temperature to obtain a yellow-black precipitate. After filtering the precipitate, it was placed in an oven at 80 °C for drying at a constant temperature for 5 h, and the porous graphene-tin tungsten oxide nanocomposite visible light catalyst was obtained by fine grinding. Its composition is [porous graphene] 100 [SnWO 4 ] 24.5.
[0036]

Example Embodiment

[0037] Example 3
[0038] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 3 g of NaOH, grind uniformly, and then heat at 760 °C for 1 h in a tube furnace under nitrogen protection, with a programmed heating rate of 5 °C/min, to obtain porous graphene; Porous graphene has a specific surface area of ​​390 m 2 /g; its conductivity is 40 S m -1; The weight loss at 900 °C is 5 wt%.
[0039] 22.6 mg of SnCl 2 ·2H 2 O and 33 mg of Na 2 WO 4 ·2H 2 O solid (weighed according to the mass ratio of 1:1) was successively added to 75 mL of deionized water, then 2 mg of anhydrous sodium acetate and 1 mg of ethylene glycol were added, and the precursor was obtained by magnetic stirring for 30 min.
[0040] The precursor was moved into a reaction tank, placed in a stainless steel reaction kettle, added with 2 g of porous graphene, sealed and placed in an oven to react at 180 °C for 8 h. After the reaction, it was cooled to room temperature to obtain a yellow-black precipitate. After filtering the precipitate, it was placed in an oven for drying at 90 °C for 6 h, and the porous graphene-tin tungsten oxide nanocomposite visible light catalyst was obtained by fine grinding. Its composition is [porous graphene] 100 [SnWO 4 ] 18.4.
[0041]
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PUM

PropertyMeasurementUnit
Specific surface area350.0m²/g
Particle size20.0 ~ 160.0nm
Specific surface area370.0m²/g
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Large specific surface area
  • Small grain size
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