Graphite-phase carbon nitride composite photocatalyst and preparation method thereof

A technology of graphite phase carbon nitride and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of photocatalytic activity of composite materials that need to be improved, unfavorable effective separation of electron-hole pairs, Insufficient contact and other problems to achieve the effect of tight combination, improved quantum efficiency, and improved separation speed

Active Publication Date: 2021-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current preparation of g-C 3 N 4 / N-TiO 2 The methods of composite materials mainly include mechanical mixing, high temperature co-sintering, hydrothermal method and other methods, and there are still some methods such as TiO 2 Easy reunion, g-C 3 N 4 with N-TiO 2 Shortcomings such as insufficient contact are not conducive to the effective separation of electron-hole pairs, and the prepared g-C 3 N 4 / N-TiO 2 The photocatalytic activity of composites still needs to be improved

Method used

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  • Graphite-phase carbon nitride composite photocatalyst and preparation method thereof
  • Graphite-phase carbon nitride composite photocatalyst and preparation method thereof
  • Graphite-phase carbon nitride composite photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] (1) Put 40g of melamine into a crucible with a cover, raise the temperature to 550°C at 4°C / min in a muffle furnace, then heat-preserve and calcinate for 4h, and after cooling to room temperature, block graphite phase carbon nitride (g-C 3 N 4 ), ground into powder, put it into a crucible with a cover, heated up to 550°C at 5°C / min in a muffle furnace, and then heat-preserved and calcined for 3h to obtain g-C 3 N 4 Nanosheets;

[0042] (2) Add 1g g-C 3 N 4 Mix the nanosheets with 60ml of absolute ethanol and 3ml of glacial acetic acid with a purity ≥ 99.5%, and form a uniform mixture A after magnetic stirring for 30 minutes; drop 2ml of butyl titanate into the mixture A, and form a uniform mixture B after magnetic stirring for 30 minutes; Drop 1ml of ammonia water containing 25% to 28% ammonia into mixture B, and stir magnetically for 60 minutes to form a uniform precursor; put the precursor in an oven at 100°C for 12 hours and then grind it to obtain a powder. Put ...

Embodiment 2

[0053] (1) Put 45g of melamine into a crucible with a cover, raise the temperature to 550°C at 4°C / min in a muffle furnace, then heat-preserve and calcinate for 4h, and after cooling to room temperature, block graphite phase carbon nitride (g-C 3 N 4 ), ground into powder, put it into a crucible with a cover, heated up to 550°C at 5°C / min in a muffle furnace, and then heat-preserved and calcined for 3h to obtain g-C 3 N 4 Nanosheets;

[0054] (2) Add 2g g-C 3 N 4 Mix the nanosheets with 80ml of absolute ethanol and 3ml of glacial acetic acid with a purity ≥ 99.5%, and form a uniform mixture A after magnetic stirring for 20 minutes; drop 3ml of butyl titanate into the mixture A, and form a uniform mixture B after magnetic stirring for 30 minutes; Drop 1.8ml of ammonia water containing 25% to 28% ammonia into mixture B, and stir magnetically for 60 minutes to form a uniform precursor; dry the precursor in an oven at 120°C for 16 hours and grind to obtain a powder. In a cove...

Embodiment 3

[0057] (1) Put 50g of melamine into a crucible with a cover, raise the temperature to 550°C at 4°C / min in a muffle furnace, then heat-preserve and calcinate for 4h, and after cooling to room temperature, block graphite phase carbon nitride (g-C 3 N 4 ), ground into powder, put it into a crucible with a cover, heated up to 550°C at 5°C / min in a muffle furnace, and then heat-preserved and calcined for 3h to obtain g-C 3 N 4 Nanosheets;

[0058] (2) Add 1g g-C 3 N 4 Mix the nanosheets with 60ml of absolute ethanol and 2ml of glacial acetic acid with a purity ≥ 99.5%, and form a uniform mixture A after magnetic stirring for 20 minutes; drop 3ml of butyl titanate into the mixture A, and form a uniform mixture B after magnetic stirring for 20 minutes; Drop 1.2ml of ammonia water containing 25% to 28% ammonia into mixture B, and stir magnetically for 40 minutes to form a uniform precursor; dry the precursor in an oven at 120°C for 16 hours and grind to obtain a powder. Put the po...

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Abstract

The invention belongs to the technical field of photocatalytic materials, and discloses a graphite-phase carbon nitride composite photocatalyst and a preparation method thereof. The method comprises the following steps: 1) mixing g-C3N4 nanosheets, an organic solvent and acid to obtain a mixture A; wherein the acid is one or more of acetic acid or lactic acid; and the organic solvent is ethanol or methanol; 2) uniformly mixing butyl titanate with the mixture A to obtain a mixture B; and 3) uniformly mixing ammonia water with the mixture B, drying and calcining to obtain the composite photocatalyst. The method is simple, N-TiO2 grows on the g-C3N4 nanosheet through an in-situ growth method, N-TiO2 nanoparticles are uniformly dispersed and have sufficient interface contact with the g-C3N4 nanosheet, the N-TiO2 nanoparticles and the g-C3N4 nanosheet are combined more tightly, and the separation speed of photo-induced electrons and holes can be effectively improved, so that the quantum efficiency is improved, and the effect of improving the catalytic efficiency of the g-C3N4 nanosheet is achieved. The catalyst provided by the invention has good catalytic activity in photocatalytic hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst materials, and in particular relates to a graphite-phase carbon nitride composite photocatalyst and a preparation method thereof. Background technique [0002] In recent years, semiconductor photocatalysts, as an important medium for converting solar energy into high-density chemical energy or directly degrading and mineralizing organic pollutants, have shown great potential in solving energy crisis and environmental pollution and have been widely studied. Among many photocatalysts, graphitic carbon nitride (g-C 3 N 4 ) has been widely studied and used due to its environmental friendliness, high chemical stability, good thermal stability, low preparation cost and simple method. At present, the most common method for preparing graphitic carbon nitride is to obtain it by pyrolyzing raw materials such as urea, dicyandiamide or melamine. But g-C prepared by pyrolysis 3 N 4 As a multi-layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C01B3/04
CPCB01J27/24B01J35/004B01J35/1004C01B3/042C01B2203/0277Y02E60/36
Inventor 陈志武蒙华星卢振亚王歆
Owner SOUTH CHINA UNIV OF TECH
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