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A visible light responsive heterojunction composite material and a preparing method and use thereof

A composite material and visible light technology, which is 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, poor degradation performance, photogenerated Poor electron-hole separation efficiency and other issues, to achieve excellent photocatalytic activity, facilitate mass production, and high-efficiency photocatalytic activity

Active Publication Date: 2019-05-21
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Recently, the green semiconductor bismuth oxychloride (Bi 3 o 4 Cl, Bi 12 o 17 Cl 2 ), 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; bismuth oxychloride is an important metal oxide with a bandgap width of It is about 2.7eV, which is a good visible light response material. At present, the research on the photocatalytic degradation of pollutants by bismuth oxychloride has been reported; however, due to its poor degradation performance and photogenerated electron The disadvantages such as poor hole separation efficiency lead to unsatisfactory photocatalytic activity and visible light utilization efficiency. In recent years, the construction of bismuth oxychloride heterojunction system is an effective strategy to improve its photocatalytic performance, that is because it Can effectively improve the separation of photogenerated electron-hole pairs, such as: Bi 3 o 4 Cl / BiOCl and Bi 12 o 17 Cl 2 / BiOCl etc., however, so far no Bi 3 o 4 Cl and Bi 12 o 17 Cl 2 Preparation and photocatalytic application of composite heterojunction

Method used

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  • A visible light responsive heterojunction composite material and a preparing method and use thereof
  • A visible light responsive heterojunction composite material and a preparing method and use thereof
  • A visible light responsive heterojunction composite material and a preparing method and use thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Step: Preparation of Bi 3 o 4 Cl nanosheets

[0022] First, 0.485g Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dispersed in 10 mL of ethylene glycol for 10 min to obtain solution A. Next, add 0.018g NH 4 Dissolve Cl in 25mL deionized water to obtain solution B. Slowly add solution B to the above solution A to form a white turbid solution C, which is transferred to a 50mL reactor and heated at 160°C for 12h. After the reactor was cooled to room temperature, the sample was washed with water and ethanol, and dried at 60°C to obtain solid powder D. Finally, put the solid powder D in a muffle furnace, raise the temperature to 500°C at a rate of 5°C / min, and bake for 5h. Finally got Bi 3 o 4 Cl nanosheets.

Embodiment 2

[0024] Steps: One-step preparation of Bi 3 o 4 Cl / Bi 12 o 17 Cl 2 Heterojunction

[0025] First, 0.485g Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dispersed in 10 mL of ethylene glycol and stirred for 10 min to obtain solution A. Next, add 0.018g NH 4 Cl was dissolved in 25mL deionized water to obtain solution B, and solution B was slowly added to the above solution A to generate white cloudy liquid C, and NaOH solution was slowly added dropwise to white cloudy liquid C to adjust pH=8 to obtain solution D, and the solution D was transferred into a 50mL reactor, and heated at 160°C for 12h. After the reactor was cooled to room temperature, the sample was washed with water and ethanol, and dried at 60°C to obtain solid powder E. Finally, put the solid powder E in a muffle furnace, raise the temperature to 500°C at a rate of 5°C / min, and bake for 5h. Finally got Bi 3 / Bi 12 -8 heterojunction materials.

Embodiment 3

[0027] Steps: One-step preparation of Bi 3 o 4 Cl / Bi 12 o 17 Cl 2 Heterojunction

[0028] First, 0.485g Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dispersed in 10 mL of ethylene glycol and stirred for 10 min to obtain solution A. Next, add 0.018g NH 4 Cl was dissolved in 25mL deionized water to obtain solution B, and solution B was slowly added to the above solution A to generate white turbid liquid C, and NaOH solution was slowly added dropwise to white turbid liquid C to adjust pH=9 to obtain solution D, and the solution D was transferred into a 50mL reactor, and heated at 160°C for 12h. After the reactor was cooled to room temperature, the sample was washed with water and ethanol, and dried at 60°C to obtain solid powder E. Finally, put the solid powder E in a muffle furnace, raise the temperature to 500°C at a rate of 5°C / min, and bake for 5h. Finally got Bi 3 / Bi 12 -9 heterojunction materials.

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Abstract

The invention belongs to the technical field of photocatalyst preparation, and particularly relates to a visible light responsive heterojunction composite material and a preparing method and use thereof. The method includes firstly subjecting Bi(NO3)<3>.5H2O to ultrasonic dispersion into ethylene glycol to obtain a solution A; then dissolving NH4Cl into deionized water to obtain a solution B; adding the solution B into the solution A to generate white turbid liquid C; adding dropwise a NaOH solution into the white turbid liquid C to obtain a solution D; transferring the solution D into a reaction kettle; performing hydrothermal treatment at 160 DEG C for 12 h; after the reaction kettle is cooled to room temperature, washing a sample with water and ethanol and drying the sample to obtain solid powder E; and finally adding the solid powder E into a muffle furnace, raising the temperature to 500 DEG C, roasting the powder for 5 h to finally obtain Bi3O4Cl / Bi<12>O<17>Cl<2> nanosheets whichshow excellent photocatalytic activity in 2,4-dichlorophenol under visible light.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation and utilizes a one-step method to synthesize Bi 3 o 4 Cl / Bi 12 o 17 Cl 2 Photocatalyst for degradation of 2.4-dichlorophenol under visible light. Background technique [0002] In recent years, with the continuous development of the economy, energy and environmental problems around the world have become more and more serious. In particular, the large-scale application of chlorophenols in industry and animal husbandry has made the pollution of phenol in the water environment a hot topic in current research, and has been listed as one of the key environmental pollutants by the US Environmental Protection Agency. The current development and utilization of solar energy is one of the important challenges to solve the current environmental crisis. In recent years, photocatalytic degradation of organic pollutants has been generally considered to be the solution to the current proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/36
Inventor 刘春波蒋恩慧宋宁车慧楠阮晓文李金桥胡伟胡颢
Owner JIANGSU UNIV
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