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Preparation method and application of a two-dimensional lateral polymer heterojunction visible light-responsive catalytic hydrogen production material

A polymer, heterojunction technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. The problems of high exciton binding energy and slow transfer rate of photogenerated carriers can improve the photocatalytic effect and reduce the cost.

Active Publication Date: 2020-10-30
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the polymer properties of graphitic carbon nitride, the binding energy of photogenerated excitons is high, and it is difficult to dissociate into photogenerated carriers (hot electrons and hot holes). At the same time, photogenerated carriers are easy to recombine and annihilate. The transfer rate of carbon nitride is also slow, which seriously restricts the application of graphitic carbon nitride in the field of energy photocatalysis.

Method used

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  • Preparation method and application of a two-dimensional lateral polymer heterojunction visible light-responsive catalytic hydrogen production material
  • Preparation method and application of a two-dimensional lateral polymer heterojunction visible light-responsive catalytic hydrogen production material
  • Preparation method and application of a two-dimensional lateral polymer heterojunction visible light-responsive catalytic hydrogen production material

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Experimental program
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Effect test

Embodiment 1

[0018] 10 g of melamine was added to 50 mL of phenanthrene in methanol solution, stirred at room temperature for 2 h, and then ultrasonically dispersed for 50 min. The power of ultrasonic dispersion was controlled at 100 W, and the temperature of ultrasonic dispersion was controlled at 40 °C. Afterwards, it was transferred to a drying oven at 60 °C for 10 h. After complete drying, it was calcined in a muffle furnace at a heating rate of 15 °C / min. During the heating process, the temperature was maintained at 300 °C for 1 h and at 400 °C for 1 h. h, keep the temperature at 550 °C for 4 h, wash with deionized water 5 times after cooling, and dry at 60 °C for 12 h. heterojunction materials. The hydrogen production of the two-dimensional heterojunction material prepared by the present invention is as high as 2156 μmol / g after being irradiated for 6 hours under a xenon lamp light source, which is about 4 times the hydrogen production of pure graphite phase carbon nitride.

[0019]...

Embodiment 2

[0022] 10 g of melamine was added to 25 mL of phenanthrene in methanol solution, stirred at room temperature for 2 h, and then ultrasonically dispersed for 50 min. The power of ultrasonic dispersion was controlled at 100 W, and the temperature of ultrasonic dispersion was controlled at 40 °C. Afterwards, it was transferred to a 60°C oven for drying for 10 h. After complete drying, it was calcined in a muffle furnace at a heating rate of 15°C / min. During the heating process, the temperature was kept at 300°C for 1 h, and at 400°C for 1 hour. h, keep the temperature at 550°C for 4 h, and other operations are the same as in Example 1. The resulting photocatalytic hydrogen production was 1314 μmol / g.

Embodiment 3

[0024] 10 g of melamine was added to 75 mL of phenanthrene in methanol solution, stirred at room temperature for 2 h, and then ultrasonically dispersed for 50 min. The power of ultrasonic dispersion was controlled at 100 W, and the temperature of ultrasonic dispersion was controlled at 40 °C. Afterwards, it was transferred to a drying oven at 60°C for 10 h. After complete drying, it was calcined in a muffle furnace at a heating rate of 15°C / min. During the heating process, the temperature was maintained at 300°C for 1 h and at 400°C for 1 hour. h, keep the temperature at 550°C for 4 h, and other operations are the same as in Example 1. The resulting photocatalytic hydrogen production was 1739 μmol / g.

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Abstract

The invention relates to a preparation method and application of a two-dimensional lateral polymer heterojunction visible light responsive catalytic hydrogen production material. The phenanthrene polymer semiconductor plane is grafted to the graphite phase carbon nitride plane using a high-temperature thermal polymerization method. Since the phenanthrene polymer The energy bands of the semiconductor and the graphite-phase carbon nitride semiconductor are matched to form a heterojunction structure, and a built-in field is formed at the junction of the heterojunction to promote the dissociation of photo-generated excitons, thereby improving the optical properties of the graphite-phase carbon nitride material. Catalytic performance, while both phenanthrene polymer semiconductor and graphite phase carbon nitride are visible light response catalysts and are polymer conjugated materials. There is π-π conjugation along the heterojunction plane, allowing photogenerated carriers to Faster transfer occurs in the π conjugated system, allowing the two-dimensional polymer heterojunction material to obtain higher photogenerated exciton dissociation efficiency and carrier transfer rate. This method has the advantages of simple process, low cost, short cycle, and visible light response. The two-dimensional lateral polymer heterojunction photocatalytic material finally formed has excellent photocatalytic hydrogen production performance.

Description

technical field [0001] The invention belongs to the technical field of new energy and new materials, and in particular relates to a preparation method and application of a two-dimensional transverse polymer heterojunction visible light response catalytic hydrogen production material. Background technique [0002] With the rapid development of modern industrialization, people's demand for energy is gradually increasing. The currently widely used fossil fuels have problems such as serious pollution and depleted reserves, which have brought serious troubles to the sustainable development of the earth. Since 1972, Japanese scientists Fujishima and Honda (Nature, 1972, 238, 37–38. doi:10.1038 / 238037a0) reported TiO 2 Since the photocatalytic decomposition of water to produce hydrogen under ultraviolet excitation, scientists are keen to use semiconductor photocatalysis to convert low-density solar energy into high-density hydrogen energy under solar radiation. In 2009, polymer se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/06C01B3/04
CPCC01B3/042B01J31/06B01J31/28C01B2203/1041C01B2203/107B01J35/39Y02E60/36
Inventor 陈银广董山山
Owner TONGJI UNIV
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