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A Synthesis of Photocatalyst Zn with Visible Light Response 2 sno 4 /bi 2 wo 6 Preparation method of nanosheets

一种光催化剂、纳米片的技术，应用在化学仪器和方法、物理/化学过程催化剂、金属/金属氧化物/金属氢氧化物催化剂等方向，能够解决光生电子不能到达催化剂表面、催化效率提高的程度有限等问题

Active Publication Date: 2020-07-07
DALIAN NATIONALITIES UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, doping usually causes lattice defects in the semiconductor and becomes a trap for capturing photo-generated electrons, resulting in the inability of some photo-generated electrons to reach the surface of the catalyst, resulting in a very limited improvement in catalytic efficiency.

Method used

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  • A Synthesis of Photocatalyst Zn with Visible Light Response <sub>2</sub> sno <sub>4</sub> /bi <sub>2</sub> wo <sub>6</sub> Preparation method of nanosheets
  • A Synthesis of Photocatalyst Zn with Visible Light Response <sub>2</sub> sno <sub>4</sub> /bi <sub>2</sub> wo <sub>6</sub> Preparation method of nanosheets
  • A Synthesis of Photocatalyst Zn with Visible Light Response <sub>2</sub> sno <sub>4</sub> /bi <sub>2</sub> wo <sub>6</sub> Preparation method of nanosheets

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Experimental program
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Effect test

Embodiment 1

[0020] (1) 2.5mmol ZnCl 2 and 1.25mmol SnCl 4 ·5H 2 O was dissolved in a mixture of 20mL deionized water and 20mL ethanol, and 10mL of 1.0M NaOH solution was added dropwise under stirring, and the stirring was continued for about 15min. Heating at 200°C for 24 hours to obtain precipitate I, which was washed three times with water and ethanol respectively, and then dried at 60°C to obtain Zn 2 SnO 4 powder.

[0021] (2) Preparation of Zn 2 SnO 4 / Bi 2 WO 6 Nanosheets, the synthesis steps are as follows: 3.92g Bi(NO 3 ) 3 ·5H 2 O dissolved in 30 mL of 5.0 M CH 3 COOH aqueous solution, to obtain solution a; 1.33g Na 2 WO 4 2H 2 O was dissolved in 48mL deionized water to obtain solution b; at room temperature, solution b was added dropwise to solution a, after stirring for 60min, the pH value was adjusted to 7 with ammonia water, and 0.0846g Zn 2 SnO 4 Add the powder to the above solution, continue to stir for 30 minutes, ultrasonicate for 30 minutes, then move the...

Embodiment 2

[0023] 3.92g Bi(NO 3 ) 3 ·5H 2 O dissolved in 30 mL of 5.0 M CH 3 COOH aqueous solution, to obtain solution a; 1.33gNa 2 WO 4 2H 2 O was dissolved in 48mL deionized water to obtain solution b; at room temperature, solution b was added dropwise to solution a, and after stirring for 60 minutes, the pH value was adjusted to 7 with ammonia water, and then the mixed solution was moved to a 120mL reaction kettle. Reacted at 200°C for 22h, cooled to room temperature to obtain a precipitate, which was washed repeatedly with deionized water and absolute ethanol, and dried at 60°C to obtain pure Bi 2 WO 6 Nanosheet photocatalysts.

[0024] From figure 2 It can be seen from above that Zn 2 SnO 4 / Bi 2 WO 6 Nanosheets and pure Bi 2 WO 6 Both nanosheets are responsive to visible light, Zn 2 SnO 4 Responsive in the UV range, and Zn 2 SnO 4 / Bi 2 WO 6 Nanosheets compared to pure Zn 2 SnO 4 and pure Bi 2 WO 6 The nanosheets produced a certain red shift, indicating tha...

Embodiment 3

[0026] (1) 2.5mmol ZnCl 2 and 1.25mmol SnCl 4 ·5H 2 O was dissolved in a mixture of 20mL deionized water and 20mL ethanol, and 10mL of 1.0M NaOH solution was added dropwise under stirring, and the stirring was continued for about 15min. Heated at 150°C for 36h to obtain precipitate I, which was washed three times with water and ethanol respectively, and then dried at 60°C to obtain Zn 2 SnO 4 powder.

[0027] (2) Preparation of Zn 2 SnO 4 / Bi 2 WO 6 Nanosheets, the synthesis steps are as follows: 3.92g Bi(NO 3 ) 3 ·5H 2 O dissolved in 30 mL of 5.0 M CH 3 COOH aqueous solution, to obtain solution a; 1.33g Na 2 WO 4 2H 2 O was dissolved in 48mL deionized water to obtain solution b; at room temperature, solution b was added dropwise to solution a, after stirring for 60min, the pH value was adjusted to 7 with ammonia water, and 0.141g Zn 2 SnO 4 Add the powder to the above solution, continue to stir for 30 minutes, ultrasonicate for 30 minutes, then move the mixed ...

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Abstract

A kind of synthesis of photocatalyst Zn with visible light response 2 SnO 4 / Bi 2 WO 6 Preparation method of nanosheets, this method first prepares Zn 2 SnO 4 powder, Zn 2 SnO 4 The powder is dissolved in Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 ·2H 2 O mixed solution, continued stirring, ultrasonic treatment, centrifugation and drying to obtain Zn 2 SnO 4 / Bi 2 WO 6 Nanosheets. Zn prepared by the present invention 2 SnO 4 / Bi 2 WO 6 Nanosheets have a large specific surface area and strong adsorption capacity; they have better visible light absorption performance, which greatly improves the photocatalytic oxidation and degradation of organic pollutants; and the Zn of the present invention 2 SnO 4 / Bi 2 WO 6 The preparation method of nanosheets is relatively simple and easy to operate.

Description

technical field [0001] The invention relates to a semiconductor photocatalyst for controlling environmental pollution and a preparation method. Background technique [0002] Energy crisis and environmental problems are two serious problems that human beings must face. How to effectively control and control the pollution of various chemical pollutants to the environment is the focus of comprehensive environmental management. In recent years, semiconductor photocatalytic oxidation technology, one of the advanced oxidation technologies, is being extensively studied by scholars at home and abroad. This technology can use solar energy as energy to degrade pollutants in the environment, effectively use solar energy, and reduce people's Energy consumption. [0003] Bi 2 WO 6 As a new type of visible light photocatalyst with a band gap of 2.7eV, it has become a research hotspot in recent years because of its good visible light catalytic performance. However, single-phase Bi 2 W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/72
CPCB01D53/8668B01J23/30B01D2255/2096B01D2255/2094B01D2255/20792B01D2255/20776B01J35/51B01J35/39B01J35/61
Inventor 邹学军李思佳于一鸣苑承禹董玉瑛
Owner DALIAN NATIONALITIES UNIVERSITY
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