Manganese oxide-graphite phase carbon nitride composite photocatalytic material and preparation method thereof

A graphitic carbon nitride, composite photocatalysis technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve wide application prospects, good thermal and chemical stability, and easy operation. Effect

Inactive Publication Date: 2016-08-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to the best of our knowledge, there are few reports on manganese-based oxide / graphite-phase carbon nitride composites.

Method used

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  • Manganese oxide-graphite phase carbon nitride composite photocatalytic material and preparation method thereof
  • Manganese oxide-graphite phase carbon nitride composite photocatalytic material and preparation method thereof
  • Manganese oxide-graphite phase carbon nitride composite photocatalytic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of 0.3mol% CM photocatalyst: Take 0.006g manganese acetate and disperse it in 10mL ethanol solution. After the pink manganese acetate crystals are completely dissolved in ethanol, add 2 g of melamine powder to the solution. Next, the above mixture was stirred at 80° C. for 2 hours with a magnetic stirrer to obtain a slurry. The slurry samples were then dried in an oven at 80°C for 20 hours. Finally, the sample was transferred to a muffle furnace at 5 °C min -1 heating rate, heated to 550 ° C and kept for 2 hours. After the sample had cooled to room temperature, the resulting product was transferred to an agate mortar and ground into a fine powder.

[0032] Its XRD pattern is as follows Figure 4 As shown in a, obvious g-C can be seen in the XRD pattern 3 N 4 The characteristic diffraction peaks of , indicating that at this temperature, a completely crystallized g-C 3 N 4 . MnO x Nanoparticles did not enter g-C 3 N 4 Lattice, only loaded on g-C 3...

Embodiment 2

[0034] Preparation of 0.9mol% CM photocatalyst: Take 0.018g manganese acetate and disperse it in 20mL ethanol solution. After the pink manganese acetate crystals are completely dissolved in ethanol, add 2 g of melamine powder to the solution. Next, the above mixture was stirred at 80° C. for 2 hours with a magnetic stirrer to obtain a slurry. The slurry samples were then dried in an oven at 100°C for 20 hours. Finally, the sample was transferred to a muffle furnace at 5 °C min -1 heating rate, heated to 550 ° C and kept for 2 hours. After the sample had cooled to room temperature, the resulting product was transferred to an agate mortar and ground into a fine powder.

[0035] Its TEM picture is as follows figure 2 shown by figure 2 a Observable, g-C 3 N 4 It is a porous two-dimensional layered structure, MnO x Nanoparticles loaded on g-C 3 N 4 On the surface, the combination between the two is relatively tight. where MnO x The nanoparticle size is around 10-15 na...

Embodiment 3

[0037] Preparation of 0.3mol% CM photocatalyst: Disperse 0.002g manganese acetate into 10mL deionized water. After the pink manganese acetate crystals are completely dissolved in water, add 10 g of urea powder to the solution. Next, the above mixture was stirred at 80°C for 2 hours with a magnetic stirrer. The samples were then dried in an oven at 80°C for 20 hours. Finally, the sample was transferred to a muffle furnace at 5 °C min -1 heating rate, heated to 550 ° C and kept for 2 hours. After the sample had cooled to room temperature, the resulting product was transferred to an agate mortar and ground into a fine powder. The hydrogen production rate is shown in Table 1.

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Abstract

The invention relates to a manganese oxide-graphite phase carbon nitride composite photocatalytic material and a preparation method thereof. The manganese oxide-graphite phase carbon nitride composite photocatalytic material is prepared by depositing manganese oxide nanoparticles on the surface of layered graphite phase carbon nitride, and the manganese element loading capacity of manganese oxide in the composite photocatalytic material is 0.3-1.2 mol%; manganese dioxide or trimanganese tetroxide or dimanganese trioxide or a mixed oxide of manganese dioxide, trimanganese tetroxide and dimanganese trioxide is adopted as manganese oxide. Manganese oxide in the composite photocatalytic material is uniformly loaded on graphite phase carbon nitride, the loading capacity is controllable, the good catalytic capacity is achieved, a manganese oxide cocatalyst is closely combined with graphite phase carbon nitride, therefore, the defects that a single photocatalyst is high in photoproduced electron hole pair composite ratio and low in photocatalytic efficiency are effectively overcome, the solar utilization efficiency is greatly improved, and the excellent catalytic activity is achieved when the composite photocatalytic material is used for photocatalytic hydrogen production. The composite photocatalytic material has the wide application prospect in the fields of photocatalysis, electrochemistry, energy, environments and the like.

Description

technical field [0001] The invention relates to a manganese oxide / graphite phase carbon nitride composite photocatalytic material and a preparation method thereof, belonging to the fields of material preparation and energy environment. Background technique [0002] With the increasingly serious energy crisis and environmental pollution problems, photocatalytic hydrogen production has gradually become a research hotspot. Recently, a novel polymer N-type semiconductor graphitic carbon nitride (g-C 3 N 4 ) has received a lot of attention. g-C 3 N 4 With a layered structure, the band gap is about 2.7eV, so it can absorb visible light. And it has the advantages of low price, high temperature resistance, good chemical stability and so on. However, g-C 3 N 4 The recombination rate of photogenerated electron-hole pairs is fast and the specific surface area is small, so that pure g-C 3 N 4 The photocatalytic performance is relatively poor. Manganese oxides (MnO x ) as an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042Y02E60/36Y02P20/133
Inventor 张军杜佳敏余家国
Owner WUHAN UNIV OF TECH
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