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Preparation method of three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with visible light broad-spectrum response

A technology of bismuth oxyiodate and bismuth oxybromide, applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve problems such as weak response to visible light, achieve excellent electron-hole separation ability, and have a wide range of applications , Solve the effect of small response range

Pending Publication Date: 2020-12-04
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bismuth oxyiodate is a polar semiconductor material with an orthorhombic crystal phase structure, and the three-dimensional structure contains I 5+ and Bi 3+ Two pairs of lone electron pairs of positive valent metal ions, and have an Aurillius-type layered structure, composed of IO 3- and (Bi 2 o 2 ) 2+ The composition of two layered structures makes it have an endogenous electric field, which is conducive to the separation of charge carriers, but its relatively wide band gap (Eg=3.07eV) makes it weak in response to visible light

Method used

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  • Preparation method of three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with visible light broad-spectrum response
  • Preparation method of three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with visible light broad-spectrum response
  • Preparation method of three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with visible light broad-spectrum response

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Experimental program
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Embodiment 1

[0029] This embodiment provides a method for preparing a three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with broad-spectrum response to visible light, which is prepared by the following two-step method:

[0030] (1) Weigh 5mmol of Bi(NO) 3 ·5H 2 O and 5 mmol KIO 3Disperse all in 60ml of deionized water, and then stir the above solution at 800rpm for 40min, transfer the above solution to a 100ml hydrothermal kettle, react hydrothermally at a temperature of 160°C for 7h, then cool to room temperature, and use the above product After washing with ionic water and absolute ethanol for 4 times, the product collected by centrifugation was placed in a drying oven at 80° C. for 12 hours to obtain nanosheet-shaped bismuth oxyiodate.

[0031] (2) Weigh 5mmol of bismuth oxyiodate and evenly disperse it in the ethylene glycol solvent of 60ml, then add Bi(NO) according to the standard that the molar ratio of Br / I is 15%. 3 ·5H 2 O and KBr were added to t...

Embodiment 2

[0034] This embodiment provides a method for preparing a three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with broad-spectrum response to visible light, which is prepared by the following two-step method:

[0035] (1) Weigh 5mmol of Bi(NO) 3 ·5H 2 O and 5 mmol KIO 3 Disperse all in 60ml of deionized water, and then stir the above solution at 800rpm for 40min, transfer the above solution to a 100ml hydrothermal kettle, react hydrothermally at a temperature of 160°C for 7h, then cool to room temperature, and use the above product After washing with ionic water and absolute ethanol for 4 times, the product collected by centrifugation was placed in a drying oven at 80° C. for 12 hours to obtain nanosheet-shaped bismuth oxyiodate.

[0036] (2) The bismuth oxyiodate that takes 5mmol is uniformly dispersed in the ethylene glycol solvent of 60ml, then the mol ratio of Br / I is 25% Bi(NO) 3 ·5H 2 O and KBr were added to the above solution (Bi(NO) 3 ·5...

Embodiment 3

[0038] This embodiment provides a method for preparing a three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with broad-spectrum response to visible light, which is prepared by the following two-step method:

[0039] (1) Weigh 5mmol of Bi(NO) 3 ·5H 2 O and 5 mmol KIO 3 Disperse all in 60ml of deionized water, and then stir the above solution at 800rpm for 40min, transfer the above solution to a 100ml hydrothermal kettle, react hydrothermally at a temperature of 160°C for 7h, then cool to room temperature, and use the above product After washing with ionic water and absolute ethanol for 4 times, the product collected by centrifugation was placed in a drying oven at 80° C. for 12 hours to obtain nanosheet-shaped bismuth oxyiodate.

[0040] (2) The bismuth oxyiodate that takes 5mmol is uniformly dispersed in the ethylene glycol solvent of 60ml, then the mol ratio of Br / I is 35% Bi(NO) 3 ·5H 2 O and KBr were added to the above solution (Bi(NO) 3 ·5...

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Abstract

The invention discloses a preparation method of a three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with visible light broad-spectrum response, wherein the preparation method comprises the steps: uniformly dispersing Bi(NO)3.5H2O and KIO3 in deionized water, and transferring into a polyvinyl fluoride lined hydrothermal kettle to perform hydrothermal reaction; centrifuging, washing and drying a product obtained by the hydrothermal reaction to obtain a product, namely nano flaky bismuth oxyiodate; and uniformly dispersing bismuth oxyiodate in an ethylene glycol solution to form a uniform solution, adding Bi(NO)3.5H2O and KBr to obtain a mixed solution, stirring, carrying out solvothermal reaction, centrifuging, washing, and drying to obtain the product, namely three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with visible light broad-spectrum response. The three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction is synthesized through morphology self-assembly growth regulated by a solvent through two steps of a hydrothermal method and a solvothermal method, and has broad-spectrum visible light absorption capability and excellent electron-hole separation capability.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, and in particular relates to a method for preparing a three-dimensional spherical bismuth oxybromide-bismuth oxyiodate heterojunction with wide-spectrum response to visible light. Background technique [0002] In recent years, due to the rapid development of society and the improvement of people's living standards, the massive consumption of energy has caused a series of energy and environmental problems. In response to energy demand and environmental protection, photocatalytic technology is a green, efficient and environmentally friendly new technology that directly utilizes solar energy. However, the current photocatalysts have low activity and weak response ability under visible light, so it is very necessary to develop a photocatalyst with broad-spectrum response to visible light. [0003] Bismuth oxyhalide (BiOX, X=I, Br, Cl) is a semiconductor photocatalyst with a tetrago...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/00B01J35/08B01J37/08B01J37/10C02F1/30B01D53/86B01D53/64C02F101/30
CPCB01J27/06B01J37/10B01J37/08C02F1/30B01D53/007B01D53/8665C02F2305/10C02F2101/30B01J35/51B01J35/39
Inventor 吴江贾焘张霞罗非刘启贞何平马昕霞
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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