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Preparation and application of bismuth tungstate and carbon nitride composite photocatalytic material

A photocatalysis and composite light technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of natural environment damage and lack of fossil energy. , to achieve the effects of environmental friendliness, simple preparation process, and enhanced electron transport capability.

Active Publication Date: 2022-01-28
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the excessive and unrestricted development and utilization of non-renewable energy sources such as coal, oil, and natural gas have caused serious damage to the natural environment and caused problems such as the lack of fossil energy.

Method used

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  • Preparation and application of bismuth tungstate and carbon nitride composite photocatalytic material
  • Preparation and application of bismuth tungstate and carbon nitride composite photocatalytic material
  • Preparation and application of bismuth tungstate and carbon nitride composite photocatalytic material

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Embodiment Construction

[0030] (1) 5g NaWO 4 2H 2 O and 1g NaOH were dissolved in 20mL deionized water, and glacial acetic acid was added dropwise to adjust the pH to 6.5, then the solution was heated to 100°C and cooled to room temperature to form solution A. Weigh 0.67g BiNO 3 ·5H 2 O dissolved in 1 mL concentrated HNO 3 , then add deionized water, and stir evenly to form bismuth nitrate solution B. Then add solution B dropwise to solution A under stirring until solution B is completely added dropwise. Turn on the heating, heat the mixed solution to 95° C., and keep stirring at this temperature for 2 h. Heating was stopped after 2h, cooled to room temperature, evaporated at room temperature for 48h, the solution was concentrated to 1 / 5 of the original solution, and colorless needle-like crystals were precipitated. Vacuum drying at 60°C for 8 hours to obtain mono-deficient bismuth tungstate: BiW 11 .

[0031] (2) Mix 1.75g ​​melamine and 0.75g NH 4 HCO 3 Put it in a porcelain boat, 5°C·min...

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Abstract

The invention discloses preparation and application of a bismuth tungstate and carbon nitride composite photocatalytic material, relates to a bismuth tungstate and carbon nitride composite photocatalytic material, and aims to solve the problems that a photocatalytic hydrogen production material synthesized in the prior art is relatively wide in forbidden band width, easy to compound photo-induced electron holes and poor in light absorption capability, and thus the existing photocatalytic hydrogen production material is low in hydrogen production efficiency and the like in the prior art. The composite photocatalytic material formed by compounding bismuth tungstate and carbon nitride is designed and developed, and the chemical formula of the composite photocatalytic material is Na9 [BiW11O38] / g-C3N4 (BiW11 / g-C3N4 for short). The synthesis method comprises the following steps: stirring sodium tungstate dihydrate and bismuth nitrate at normal temperature to prepare polyacid Na9 [BiW11O38], and compounding the polyacid Na9 [BiW11O38] with g-C3N4 to prepare the BiW11 / g-C3N4 composite photocatalytic material. The semiconductor composite photocatalytic material obtained by the method is used for preparing hydrogen by photocatalytic decomposition of water at normal temperature and normal pressure.

Description

technical field [0001] The invention discloses a composite nano material of bismuth tungstate and carbon nitride. Background technique [0002] Fossil energy is an essential energy basis for human development and survival. However, the excessive and unrestricted development and utilization of non-renewable energy such as coal, oil, and natural gas by human beings has caused serious damage to the natural environment and caused problems such as the shortage of fossil energy. Therefore, the future energy direction will turn to the development of clean and sustainable new energy. Hydrogen has a high combustion value, and the combustion product is non-polluting water, which is environmentally friendly, green and renewable. Photocatalytic technology can use solar energy for energy conversion, realize photocatalytic water splitting to generate hydrogen, and convert solar energy into pure and pollution-free hydrogen energy. This provides a new strategy for solving human energy sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/31C01B3/04
CPCB01J27/24B01J23/31B01J23/002C01B3/042B01J2523/00B01J35/23B01J35/39B01J2523/12B01J2523/54B01J2523/69Y02E60/36
Inventor 王新铭李汉奇马慧媛庞海军
Owner HARBIN UNIV OF SCI & TECH
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