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High-electron-hole pair separation efficiency composite photocatalyst and preparation method thereof

A technology of recombining light and hole pairs, applied in the field of photocatalysis, can solve the problem of low electron-hole separation rate, achieve the effect of improving electron-hole separation efficiency, enhancing photocatalytic performance, and simple and easy preparation method

Active Publication Date: 2019-05-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But g-C 3 N 4 There are still shortcomings such as low electron-hole separation rate. For g-C 3 N 4 After treatment, a single-layer or few-layer graphene-like structure carbon nitride two-dimensional material can be obtained by exfoliation, and further compounded with niobium pentoxide, its properties may show characteristics different from graphene-type carbon nitride

Method used

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  • High-electron-hole pair separation efficiency composite photocatalyst and preparation method thereof
  • High-electron-hole pair separation efficiency composite photocatalyst and preparation method thereof
  • High-electron-hole pair separation efficiency composite photocatalyst and preparation method thereof

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Embodiment 1

[0020] The present invention is a kind of Nb 2 o 5 / 2D g-C 3 N 4 (6.1%) (Nb 2 o 5 accounted for the entire Nb 2 o 5 / 2Dg-C 3 N 4 6.1% of the mass of the composite photocatalyst) The preparation method of the composite photocatalytic material comprises the following steps: adding the niobium pentoxide nano-sphere flower synthesized by hydrothermal method into the deionized water, stirring for 30min, ultrasonication for 1h, making it stir evenly, and preparing Suspension with a concentration of 0.02 mg / L; add the suspension obtained by adding 2 mL of the above to melamine, stir for 40 min, and make it evenly mixed; then move the evenly stirred mixture to a crucible, put it into a muffle furnace for secondary calcination, The heating rate of the primary calcination is 2°C / min, and it is kept at 550°C for 240 minutes. The heating rate of the second calcination is 10°C / min, and it is kept at 530°C for 100 minutes. The obtained white solid is the Nb 2 o 5 / 2D g-C 3 N 4 (...

Embodiment 2

[0022] The present invention is a kind of Nb 2 o 5 / 2D g-C 3 N 4 (10.4%) (Nb 2 o 5 accounted for the entire Nb 2 o 5 / 2Dg-C 3 N 410.4% of the mass of the composite photocatalyst) The preparation method of the composite photocatalytic material comprises the following steps: adding the niobium pentoxide nano-sphere flower synthesized by hydrothermal method into deionized water, stirring for 30min, ultrasonication for 1h, making it stir evenly, and preparing Suspension with a concentration of 0.02 mg / L; add the suspension obtained by adding 4 mL of the above to melamine, stir for 40 min, and make it evenly mixed; then move the evenly stirred mixture to a crucible, put it into a muffle furnace for secondary calcination, The heating rate of the primary calcination is 3°C / min, and it is kept at 550°C for 240 minutes. The heating rate of the second calcination is 15°C / min, and it is kept at 520°C for 120 minutes. The obtained white solid is the Nb 2 o 5 / 2D g-C 3 N 4 (10....

Embodiment 3

[0024] The present invention is a kind of Nb 2 o 5 / 2D g-C 3 N 4 (17.2%) (Nb 2 o 5 accounted for the entire Nb 2 o 5 / 2Dg-C 3 N 4 17.2% of the mass of the composite photocatalyst) The preparation method of the composite photocatalytic material comprises the following steps: adding the niobium pentoxide nano-sphere flower synthesized by hydrothermal method into the deionized water, stirring for 30min, ultrasonication for 1h, making it stir evenly, and preparing Suspension with a concentration of 0.02mg / L; add the above 6mL suspension to melamine, stir for 40min to make it evenly mixed; then move the evenly stirred mixture to a crucible, put it into a muffle furnace for secondary calcination, The heating rate of the primary calcination is 4°C / min, and it is kept at 550°C for 240 minutes. The heating rate of the second calcination is 20°C / min, and it is kept at 510°C for 140 minutes. The obtained white solid is the Nb 2 o 5 / 2D g-C 3 N 4 (17.2%) composite photocatalyt...

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Abstract

The invention relates to a high-electron-hole pair separation efficiency composite photocatalyst and a preparation method thereof. The preparation method includes the steps: placing hydrothermal synthesis nano-sphere flower-shaped Nb2O5 materials into deionized water to perform ultrasound until the materials are uniformly dispersed, dripping acquired suspension liquid into melamine, and uniformlystirring and mixing mixture; moving the uniformly stirred mixture into a crucible, placing the crucible into a muffle furnace to perform secondary calcining to obtain white solid, namely, a Nb2O5 / 2D g-C3N4 photocatalytic material.

Description

technical field [0001] The invention relates to a composite photocatalyst with a high electron-hole pair separation rate and a preparation method thereof, which is used in the field of photocatalysis as a new energy material. Background technique [0002] As a renewable secondary energy source, hydrogen has fast reaction speed, high calorific value, and can be obtained through various methods. The only product of hydrogen after releasing energy is water, which is an environmentally friendly energy source. At present, hydrogen energy has not been widely used, but it is hailed as a promising energy source, mainly because hydrogen energy can reduce human dependence on fossil fuels, thereby reducing emissions of greenhouse gases and other toxic gases. There are many ways to produce hydrogen, which can be obtained by reforming, decomposing, photolyzing or hydrolyzing compounds, or by electrolyzing water, or using microorganisms for fermentation or photosynthesis to obtain hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCY02E60/36
Inventor 吉海燕王婷黄济华费婷许晖李华明郑筱雯
Owner JIANGSU UNIV
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