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Composite photocatalyst, preparation method of composite photocatalyst, and photocatalytic hydrogen production method

A technology of composite light and catalyst, applied in the field of photocatalysis, can solve the problems of low solar energy utilization rate, low quantum efficiency, and limited application, and achieve good visible light photocatalytic activity, improve quantum efficiency, and easy-to-source effects

Inactive Publication Date: 2018-12-14
王楷
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ordinary graphitic carbon nitride photocatalysts do not fully have the potential for sustainable development. One of the important reasons is that the photogenerated electron holes of graphitic carbon nitride are very easy to recombine, which leads to its low utilization rate of solar energy. low; in addition, the low quantum efficiency of graphitic carbon nitride also seriously limits its further application

Method used

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  • Composite photocatalyst, preparation method of composite photocatalyst, and photocatalytic hydrogen production method
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  • Composite photocatalyst, preparation method of composite photocatalyst, and photocatalytic hydrogen production method

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Embodiment 2

[0042] Embodiment 2 of the present invention is a method for preparing a composite photocatalyst, including the following steps:

[0043] Step A1, disperse barium niobate nanosheets in the second ultrapure water, and add urea to obtain solution D;

[0044] Step A2, heating the solution D and fully stirring until a dry product is formed;

[0045] Step A3, calcining the dried product, and separating a pale yellow precipitate after cooling;

[0046] Step A4: Washing and drying the light yellow precipitate in sequence to obtain a graphite phase carbon nitride-barium niobate composite photocatalyst.

Embodiment 3

[0047] Example 3 of the present invention is a method for preparing a composite photocatalyst. Based on Example 2, the mass ratio of the barium niobate nanosheets to the urea is 1:20.

[0048] Example 4 of the present invention is a method for preparing a composite photocatalyst. On the basis of Example 2 or 3, the heating is performed by a water bath method, and the water bath temperature of the water bath method is 80°C; the calcination is performed in a Maffei furnace It was carried out in medium and lasted at 500°C for 2 hours.

[0049] Example 5 of the present invention is a method for preparing a composite photocatalyst. On the basis of any of Examples 2 to 4, the barium niobate nanosheets are prepared by the following steps:

[0050] Step B1, dissolving barium hydroxide in the first ultrapure water and fully stirring to obtain solution A; dissolving niobium pentachloride in absolute ethanol and fully stirring to obtain solution B;

[0051] Step B2, adding the solution B to the ...

Embodiment 6

[0054] Example 6 of the present invention is a method for preparing a composite photocatalyst. On the basis of Example 5, the barium hydroxide is barium hydroxide octahydrate.

[0055] Example 7 of the present invention is a method for preparing a composite photocatalyst. On the basis of Example 6, the mass ratio of the barium hydroxide octahydrate to the niobium pentachloride is 5.85:1, and the first ultrapure The volume ratio of water to the absolute ethanol is 5:1.

[0056] Example 8 of the present invention is a method for preparing a composite photocatalyst. On the basis of any one of Examples 5 to 7, the hydrothermal reaction lasts for 48 hours at 180°C.

[0057] Embodiment 9 of the present invention is a method for photocatalytic hydrogen production of a composite photocatalyst, which uses the graphite phase carbon nitride-barium niobate composite photocatalyst for photocatalytic hydrogen production.

[0058] Embodiment 10 of the present invention is a method for photocatalytic...

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Abstract

The invention relates to a composite photocatalyst, a preparation method of the composite photocatalyst, and a photocatalytic hydrogen production method. The composite photocatalyst is prepared by thefollowing steps: modifying graphite phase carbon nitride by adopting barium niobate nanosheets, and preparing the graphite phase carbon nitride-barium niobate composite photocatalyst. The 3d track ofniobium participates in composition of the valence band, so that the conduction band is enriched in free electrons; due to the diversity of the crystal structure and electron structure, the barium niobate has an appropriate energy band structure and high photo-induced carrier mobility; in addition, the graphite phase carbon nitride is modified by the barium niobate nanosheets, so that heterojunctions are produced between the barium niobate nanosheets and the graphite phase carbon nitride. Due to the special energy band structure produced by the heterojunctions and the carrier transport characteristics, the graphite phase carbon nitride-barium niobate composite photocatalyst having the heterojunction structure is capable of effectively inhibiting compounding of the photo-induced electron holes in a light-catalyzed reaction, and the quantum efficiency is improved. Therefore, the graphite phase carbon nitride-barium niobate composite photocatalyst has excellent visible light photocatalytic activity.

Description

Technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a composite photocatalyst, a preparation method thereof and a photocatalytic hydrogen production method. Background technique [0002] Photocatalytic technology has shown unique potential application value in managing environmental problems and solving energy crises, especially in the high-efficiency generation of clean energy. Among the many photocatalytic materials, graphite-phase carbon nitride has become one of the most concerned photocatalytic materials due to its low cost, redox ability and high photochemical stability. However, ordinary graphite-phase carbon nitride photocatalysts do not have the potential for sustainable development. One of the important reasons is that the graphite-phase carbon nitride photogenerated electrons and holes are very easy to recombine, which leads to its high utilization of solar energy. In addition, the lower quantum efficiency of graphit...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J27/24C01B2203/1041C01B2203/0277B01J35/39Y02E60/36
Inventor 王楷
Owner 王楷
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