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Efficient composite photocatalyst α-fe in response to visible light 2 o 3 /in 2 the s 3 preparation method

A technology of -fe2o3 and composite light, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as poor separation, low conduction band position, and low photocatalytic activity

Active Publication Date: 2021-04-27
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since hematite (α-Fe 2 o 3 ) conduction band position is too low, not enough to reduce oxygen, so that the recombination probability of photogenerated carriers is high, and the separation is poor, making its photocatalytic activity low

Method used

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  • Efficient composite photocatalyst α-fe in response to visible light <sub>2</sub> o <sub>3</sub> /in <sub>2</sub> the s <sub>3</sub> preparation method
  • Efficient composite photocatalyst α-fe in response to visible light <sub>2</sub> o <sub>3</sub> /in <sub>2</sub> the s <sub>3</sub> preparation method

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Embodiment 1

[0030] High-efficiency composite photocatalyst α-Fe responsive to visible light of the present invention 2 o 3 / In 2 S 3 The preparation method comprises the steps of: weighing 0.003mol α-Fe prepared by hydrothermal method 2 o 3 Nanoparticles, drop 10mL molar concentration of indium nitrate solution (wherein, n(α-Fe 2 o 3 ): n(In(NO 3 ) 3 ·5H 2 (2)=9:2), ultrasonic 15min disperses evenly, then slowly drips 20mL molar concentration under stirring and is the sodium sulfide solution of 0.083mol / L (wherein, n(In(NO 3 ) 3 ·5H 2 O): n(Na 2 S)=1:2.5) into the above suspension, the pH value of the solid suspension was maintained at 3, and then it was transferred to an autoclave and placed in an oven at 180°C for aging for 24h. The obtained solid phase was washed with water until neutral, dried at 60°C for 5 hours, and ground for later use to obtain α-Fe 2 o 3 / In 2 S 3 composite photocatalyst.

[0031] Among them, α-Fe 2 o 3 The preparation method of nanoparticle co...

Embodiment 2

[0033] High-efficiency composite photocatalyst α-Fe responsive to visible light of the present invention 2 o 3 / In 2 S 3 The preparation method comprises the steps of: weighing 0.0032mol α-Fe prepared by hydrothermal method 2 o 3 Nanoparticles, drop 5mL molar concentration of 0.0067mol / L indium nitrate solution (wherein, n(α-Fe 2 o 3 ): n(In(NO 3 ) 3 ·5H 2 (2)=19:2), ultrasonic 15min disperses evenly, then slowly drips 20mL of sodium sulfide solution (wherein, n(In(NO 3 ) 3 ·5H 2 O):n(Na 2 S)=1:2.5) into the above suspension, the pH value of the solid suspension was maintained at 3, and then it was transferred to an autoclave and placed in an oven at 180°C for aging for 24 hours. The obtained solid phase was washed with water until neutral, dried at 60°C for 5 hours, and ground for later use to obtain α-Fe 2 o 3 / In 2 S 3 composite photocatalyst.

[0034] Among them, α-Fe 2 o 3 The preparation method of nanoparticle comprises the steps: get 16.16g Fe(NO 3 )...

Embodiment 3

[0036] High-efficiency composite photocatalyst α-Fe responsive to visible light of the present invention 2 o 3 / In 2 S 3 The preparation method comprises the steps of: weighing 0.0028mol α-Fe prepared by hydrothermal method 2 o 3 Nanoparticles, drop 15mL molar concentration of 0.0067mol / L indium nitrate solution (wherein, n(α-Fe 2 o 3 ):n(In(NO 3 ) 3 ·5H 2 (2)=17:6), ultrasonic 15min disperses evenly, then slowly drips 20mL molar concentration of 0.125mol / L sodium sulfide solution under stirring (wherein, n(In(NO 3 ) 3 ·5H 2 O):n(Na 2 S)=1:2.5) into the above suspension, the pH value of the solid suspension was maintained at 3, and then it was transferred to an autoclave and placed in an oven at 180°C for aging for 24 hours. The obtained solid phase was washed with water until neutral, dried at 60°C for 5 hours, and ground for later use to obtain α-Fe 2 o 3 / In 2 S 3 composite photocatalyst.

[0037] Among them, α-Fe 2 o 3 The preparation method of nanoparti...

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Abstract

The invention discloses a high-efficiency composite photocatalyst α-Fe responsive to visible light 2 o 3 / In 2 S 3 A preparation method comprising the steps of: 1) α-Fe 2 o 3 The nanoparticles are mixed with the trivalent indium salt solution and then ultrasonically dispersed to form a uniform solid suspension; 2) aging reaction: add sodium sulfide solution dropwise to the solid suspension obtained in step 1) for complete reaction, and then transfer it to 3) drying and grinding: washing the solid phase obtained in step 2) until neutral, then drying and grinding in sequence. The preparation method of the invention not only broadens the absorption of visible light, but also can effectively inhibit charge recombination, has higher photocatalytic activity, and is beneficial to the degradation of organic matter.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a high-efficiency composite photocatalyst α-Fe responsive to visible light 2 o 3 / In 2 S 3 method of preparation. Background technique [0002] Hematite (α-Fe 2 o 3 ) is a visible light-responsive semiconductor with a band gap of 0.28-2.48eV. Compared with other photocatalysts, α-Fe 2 o 3 The preparation conditions are mild, the process is simple, and it has the advantages of low price, non-toxicity, and abundant natural reserves. α-Fe 2 o 3 It is an environmentally friendly material, so it has many applications in the field of environmental restoration, such as photocatalytic degradation of organic dyes, organic acids, and aldehydes. [0003] However, since hematite (α-Fe 2 o 3 )'s conduction band position is too low to reduce oxygen, so that the recombination probability of photogenerated carriers is high, and the separation is poor, resulting in low photocat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043B01J35/00
CPCB01J27/043B01J35/004
Inventor 张英蒋阮经段帅张秀宇彭波
Owner YANGTZE UNIVERSITY
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