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Preparation method and silicon modification method of visible light catalysis material for graphene/bismuth tungstate flake nanostructure

A nanostructure and catalytic material technology, applied in the field of photocatalytic materials, can solve the problems of low photocatalytic efficiency, limit the wide application of bismuth tungstate, and low photon quantum yield, and achieve enhanced interaction, improved photocatalytic efficiency, and improved dispersion and the effect of surface activity

Active Publication Date: 2014-03-26
宁波行殊新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low photon quantum yield of bismuth tungstate materials, the generated photogenerated electron-hole pairs are easy to recombine, showing low photocatalytic efficiency.
In addition, tungsten and bismuth are rare metals and are relatively expensive, which limits the wide application of bismuth tungstate in industry

Method used

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  • Preparation method and silicon modification method of visible light catalysis material for graphene/bismuth tungstate flake nanostructure
  • Preparation method and silicon modification method of visible light catalysis material for graphene/bismuth tungstate flake nanostructure
  • Preparation method and silicon modification method of visible light catalysis material for graphene/bismuth tungstate flake nanostructure

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Experimental program
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Embodiment 1

[0028] Example 1 (without silicon modification)

[0029] (1) Add 3 mL of graphene oxide solution with a concentration of 0.6 g / L into 70 mL of deionized water and ultrasonically disperse for 30 min to obtain a stable graphene dispersion;

[0030] (2) Stir and ultrasonically disperse the above solution at a temperature of 0-40°C for 15-30 min to obtain a uniformly dispersed solution;

[0031] (3) Add 0.3 g sodium tungstate, an organic electrolyte composed of 2 g polyacrylic acid (polyacrylic acid 800-1000) and 0.8 g cetyltrimethylammonium bromide to the above solution, stir and dissolve, and place in Continue ultrasonic stirring at 35°C for 15 min; freeze at 0°C for 14 h, then add 0.45 g of bismuth nitrate under ultrasonic stirring, and ultrasonically stir for 30 min to obtain a colloidal solution;

[0032] (4) Aging the colloidal solution described in step (3) at room temperature (25°C) for 2 hours, and then transferring it to a reaction kettle with a volume of 100 mL for 10 ...

Embodiment 2

[0034] Embodiment 2: (carry out silicon modification)

[0035] (1) Add 12 mL of reduced graphene oxide solution with a concentration of 0.8 g / L into 60 mL of deionized water and ultrasonically disperse for 40 min to obtain a stable graphene dispersion;

[0036] (2) Add 3 mL tetraethyl orthosilicate to the above solution, then stir and ultrasonically disperse at 30°C for 30 min to obtain a uniformly dispersed solution, and let it stand for 18 h;

[0037] (3) Add 3.042 g of ammonium tungstate, an organic electrolyte composed of 2 g of polyacrylic acid and 0.8 g of hexadecyltrimethylammonium bromide to the above solution, stir and dissolve, and continue ultrasonic stirring at a temperature of 40°C 30 min; freeze at -10°C for 12 h, then add 0.8 g of bismuth nitrate under ultrasonic stirring, and ultrasonically stir for 30 min to obtain a colloidal solution;

[0038] (4) Aging the colloidal solution described in step (3) at room temperature (25 °C) for 1 h, and then transferring...

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Abstract

The invention relates to a preparation method and silicon modification method of a visible light catalysis material for a graphene / bismuth tungstate flake nanostructure. According to the preparation method and the silicon modification method, with bismuth nitrate, tungstate, ethyl orthosilicate and graphene as raw materials, the solar catalysis material for the graphene / bismuth tungstate flake nanostructure is prepared by the steps including an organic electrolyte assisted hydrothermal method, low temperature freezing, ageing, washing, drying and the like, and the catalysis performance of the material is further enhanced by silicon modification. The preparation method and the silicon modification method disclosed by the invention have the greatest characteristics that the strong-adsorption and high-activity visible light catalysis material for a graphene / bismuth nitrate flake is obtained by using the low-temperature freezing organic electrolyte assisted hydrothermal method, and the performance of the graphene / bismuth tungstate flake structure is further improved by silicon modification. The catalysis material can be applied to the fields of sewage treatment, light degradation of water, air purification, solar batteries and the like.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and relates to a preparation method of a graphene / bismuth tungstate sheet nanostructure visible light catalytic material and a silicon modification method thereof. Background technique [0002] Bismuth tungstate (Bi 2 WO 6 ) is formed by the octahedral WO 6 and Bi 2 o 2 A typical n-type semiconductor formed by accumulating layers, it has excellent chemical properties, unique ferroelectric properties, catalytic properties and nonlinear dielectric magnetic susceptibility, and is a good visible light catalyst material. Since Kudo and Hijii reported for the first time in 1999 that bismuth tungstate has the activity of photocatalytic water splitting, it has attracted widespread attention of scientists from all over the world. Bi 2 WO 6 The valence band is composed of Bi6s and O2p hybrid orbitals, while the conduction band is composed of W5d orbitals, which makes the forbidden band width ...

Claims

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Application Information

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IPC IPC(8): B01J23/31B82Y40/00B82Y30/00
Inventor 陈传盛谢小缔刘天贵曹时义肖依
Owner 宁波行殊新能源科技有限公司
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