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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of tin-tungsten oxide prepared by solvothermal method is uncontrollable and easy to agglomerate, which reduces its specific surface area and visible light catalytic activity, thus limiting its application.

Method used

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  • 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
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 1 g of graphene oxide prepared by the modified Hummer method, add 5 g of NaOH, grind it evenly, and then place it in a tube furnace and heat it at 760 °C for 1 h under a nitrogen atmosphere, with a programmed temperature increase 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 ℃ is 4 wt%.

[0026] 22.6 mg of SnCl 2 2H 2 O and 33 mg of Na 2 WO 4 2H 2 The O solid (weighed according to the mass 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 magnetically stirred for 30 min to obtain the precursor.

[0027] Move the precursor into a reaction tank, put it into a stainless steel reaction kettle, add 1 g of porous graphene, seal it, put it in an oven, and react at 170 °C for 6 h. After the reaction, it was cooled to room temperature to obtain a yellow-bl...

Embodiment 2

[0033] Weigh 1 g of graphene oxide prepared by the modified Hummer method, add 4 g of KOH, grind it evenly, and then place it in a tube furnace and heat it at 760 °C for 1 h under a nitrogen atmosphere, with a programmed temperature increase 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 ℃ was 4.5 wt%.

[0034] 22.6 mg of SnCl 2 2H 2 O and 33 mg of Na 2 WO 4 2H 2 The 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 magnetically stirred for 30 min to obtain the precursor.

[0035] Move the precursor into a reaction tank, put it into a stainless steel reaction kettle, add 1.5 g of porous graphene, seal it, put it in an oven, and react at 180 °C for 7 h. After the reaction, it was cooled to room temperature to obtain a yel...

Embodiment 3

[0038] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 3 g of NaOH, grind evenly, and then heat in a tube furnace at 760 °C for 1 h under nitrogen protection, with a programmed temperature rise 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 ℃ is 5 wt%.

[0039] 22.6 mg of SnCl 2 2H 2 O and 33 mg of Na 2 WO 4 2H 2 The 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 magnetically stirred for 30 min to obtain the precursor.

[0040] Move the precursor into a reaction tank, put it into a stainless steel reaction kettle, add 2 g of porous graphene, seal it, put it in an oven, and react at 180 °C for 8 h. After the reaction, it was cooled to room temperature to obtain a yellow-black precipitate. After th...

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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%.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and relates to a porous graphene-tin tungsten oxide nanocomposite visible light catalyst and a preparation method thereof. Background technique [0002] With the continuous development of industry, water pollution and ecological deterioration of the water environment have become constraints to development (Rajagopal C, Kapoor J C. Development of adsorbtive removal process for treatment of sxplosives contaminated waste water using activated carbon [J]. Journal of Hazardous Materials, 2001, 87(1): 73-78). The commonly used methods for industrial wastewater treatment mainly include physical, chemical and biological methods. Among them, the physical method is to use physical action to treat, separate and recover pollutants in wastewater, including precipitation method, flotation method, filtration method, and evaporation method. Chemical methods use chemical reactions or physical and chemica...

Claims

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Application Information

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IPC IPC(8): B01J23/30C02F1/30
CPCY02W10/37
Inventor 邓凌峰谭彬叶国富蔡祥夏燎原袁志庆何新快刘奇龙
Owner 湖南元素密码石墨烯高科技有限公司
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