A visible light responsive nb 2 o 5 /g‑c 3 n 4 Preparation method and use of heterojunction material

A heterojunction and visible light technology, applied in chemical instruments and methods, light water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of photocatalytic activity and visible light utilization efficiency, and achieve excellent light Catalytic activity, convenient mass production, and low cost effects

Inactive Publication Date: 2017-10-20
JIANGSU UNIV
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Problems solved by technology

[0003] Recently, a new type of graphite-like phase non-metal semiconductor nitrogen carbide (g-C 3 N 4 ), due to its good chemical and thermal stability, low cost, safety and non-toxicity, it has gradually attracted the attention of researchers in the field of photocatalysis; g-C 3 N 4 It is an amorphous carbonitride compound with a bandgap width of about 2.7 eV. It is a good visible light responsive material. At present, g-C 3 N 4 Studies on the photocatalytic degradation of pollutants have been extensively reported; however, a single g-C 3 N 4 The photocatalytic activity and visible light utilization efficiency of the material are not ideal due to its own energy band structure and its fast recombination rate of photogenerated electrons and holes. In recent years, the construction of g-C 3 N 4 Based heterojunction system is an effective strategy to improve its photocatalytic performance, because it can effectively improve the separation of photogenerated electron-hole pairs
On the other hand, niobium pentoxide (Nb 2 o 5 ), as an important metal oxide, it is found that a small amount of Nb 2 o 5 Combining with semiconductors to form a heterojunction can significantly enhance the photocatalytic performance, such as: TiO 2 / Nb 2 o 5 , ZnO / Nb 2 o 5 and CdS / Nb 2 o 5 etc., however, so far no Nb 2 o 5 with g-C 3 N 4 Preparation and photocatalytic application of composite heterojunction

Method used

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  • A visible light responsive nb <sub>2</sub> o <sub>5</sub> /g‑c <sub>3</sub> n <sub>4</sub> Preparation method and use of heterojunction material
  • A visible light responsive nb <sub>2</sub> o <sub>5</sub> /g‑c <sub>3</sub> n <sub>4</sub> Preparation method and use of heterojunction material
  • A visible light responsive nb <sub>2</sub> o <sub>5</sub> /g‑c <sub>3</sub> n <sub>4</sub> Preparation method and use of heterojunction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Weigh 2.5 g of melamine, place it in an agate mortar, and grind it evenly for 5 minutes to obtain sample A.

[0025] Step 2: Weigh 0.025 g of niobium pentoxide and 2.5 g of melamine respectively, place them in an agate mortar, grind and mix them evenly for 5 minutes, and obtain sample B.

[0026] Step 3: Transfer sample A and sample B to a 50 mL round crucible, cover the crucible and place it horizontally in the muffle furnace, set the initial temperature of the muffle furnace to 50 °C, and increase the temperature at a rate of 2.3 °C / min Raise the temperature of the muffle furnace to 550 °C, and react at this temperature for 4 h, and wait for natural cooling to room temperature to obtain samples A 1 and B 1 .

[0027] Step 4: Separate sample A 1 and B 1 Transfer to an agate mortar and grind for 5 min to finally obtain g-C 3 N 4 and Nb 2 o 5 / g -C 3 N 4 heterojunction samples.

Embodiment 2

[0029]Step 1: Weigh 2.5 g of melamine, place it in an agate mortar, and grind it evenly for 5 minutes to obtain sample A.

[0030] Step 2: Weigh 0.075 g of niobium pentoxide and 2.5 g of melamine respectively, place them in an agate mortar, grind and mix them evenly for 5 minutes, and obtain sample B.

[0031] Step 3: Transfer sample A and sample B to a 50 mL round crucible, cover the crucible and place it horizontally in the muffle furnace, set the initial temperature of the muffle furnace to 50 °C, and increase the temperature at a rate of 2.3 °C / min Raise the temperature of the muffle furnace to 550 °C, and react at this temperature for 4 h, and wait for natural cooling to room temperature to obtain samples A 1 and B 1 .

[0032] Step 4: Separate sample A 1 and B 1 Transfer to an agate mortar and grind for 5 min to finally obtain g-C 3 N 4 and Nb 2 o 5 / g -C 3 N 4 heterojunction samples.

Embodiment 3

[0034] Step 1: Weigh 2.5 g of melamine, place it in an agate mortar, and grind it evenly for 5 minutes to obtain sample A.

[0035] Step 2: Weigh 0.125 g of niobium pentoxide and 2.5 g of melamine respectively, place them in an agate mortar, grind and mix evenly for 5 minutes, and obtain sample B.

[0036] Step 3: Transfer sample A and sample B to a 50 mL round crucible, cover the crucible and place it horizontally in the muffle furnace, set the initial temperature of the muffle furnace to 50 °C, and increase the temperature at a rate of 2.3 °C / min Raise the temperature of the muffle furnace to 550 °C, and react at this temperature for 4 h, and wait for natural cooling to room temperature to obtain samples A 1 and B 1 .

[0037] Step 4: Separate sample A 1 and B 1 Transfer to an agate mortar and grind for 5 min to finally obtain g-C 3 N 4 and Nb 2 o 5 / g -C 3 N 4 heterojunction samples.

[0038] By adjusting the mass ratio of adding different niobium pentoxide and m...

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Abstract

The invention belongs to the technical field of nano material synthesis. A niobium pentoxide and graphite-like phase carbonized nitrogen heterojunction photocatalyst is synthesized by a simple and quick thermal polymerization method by one step, and can be used for degrading a methylene blue stain under visible light. A preparation method comprises the following steps: uniformly grinding and mixing niobium pentoxide and melamine, and obtaining a sample B; transferring the sample B into a circular crucible, covering the crucible with a crucible cover, horizontally placing the crucible into a muffle furnace, heating the muffle furnace to 550 DEG C, reacting under the temperature for 4 hours, naturally cooling to room temperature, and obtaining a sample B1; uniformly grinding the sample B1, and finally obtaining an Nb2O5 / g-C3N4 heterojunction sample.

Description

technical field [0001] The invention belongs to the technical field of nanometer material synthesis, and uses a simple and fast thermal polymerization method to synthesize niobium pentoxide and graphite-like phase nitrogen carbide heterojunction photocatalyst in one step, which can be used to degrade methylene blue dye under visible light. Background technique [0002] Since the 21st century, the environmental pollution and energy crisis faced by human beings have become increasingly serious. The current development and utilization of solar energy is one of the important challenges to solve the current crisis. In recent years, photocatalytic degradation of organic pollutants has energy-saving, high Thoroughness and other advantages have been generally considered to be an ideal way to solve the current problem of organic compound pollution in water bodies. Photocatalytic technology can use green and pollution-free solar energy to achieve the degradation of organic pollutants i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCY02W10/37
Inventor 洪远志施伟东李长生孟亚东张光倚殷秉歆
Owner JIANGSU UNIV
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