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Bismuth oxychloride/silver/silver ferrite ternary composite z-type photocatalyst and its preparation method and application

A technology of bismuth oxychloride and photocatalyst, which is applied in the field of photocatalysis, can solve the problems of easy recombination of electrons and holes, limit the application of silver ferrite, and weak redox ability, so as to reduce recombination, improve visible light absorption capacity, and inhibit agglomeration Effect

Active Publication Date: 2020-08-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silver ferrite (AgFeO 2 ) is a narrow bandgap semiconductor (1.15-1.7eV), which can use a wide range of solar energy spectrum and is easily excited by light to generate carriers to participate in the degradation process of pollutants, but it has electrons and holes that are easy to recombine and redox The disadvantages of weak ability and low quantum efficiency greatly limit the application of silver ferrite in the field of photocatalysis

Method used

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  • Bismuth oxychloride/silver/silver ferrite ternary composite z-type photocatalyst and its preparation method and application
  • Bismuth oxychloride/silver/silver ferrite ternary composite z-type photocatalyst and its preparation method and application
  • Bismuth oxychloride/silver/silver ferrite ternary composite z-type photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A kind of bismuth oxychloride / silver / silver ferrite (Bi 12 o 17 Cl 2 / Ag / AgFeO 2 ) ternary composite Z-type photocatalyst, bismuth oxychloride (Bi 12 o 17 Cl 2 ) as a carrier, bismuth oxychloride coated with silver ferrite (AgFeO 2 ), silver elemental (Ag) is loaded on the silver ferrite.

[0045] In this embodiment, the mass percentage of bismuth oxychloride in the bismuth oxychloride / silver / silver ferrite ternary composite Z-type photocatalyst is 10%.

[0046] In this embodiment, bismuth oxychloride has a flake structure; silver ferrite has a granular structure.

[0047] A kind of bismuth oxychloride / silver / silver ferrite (Bi 12 o 17 Cl 2 / Ag / AgFeO 2 ) The preparation method of ternary composite Z type photocatalyst, comprises the following steps:

[0048] (1) Preparation of bismuth oxychloride

[0049] (1.1) Under stirring conditions, add 2.5 mmol of bismuth nitrate pentahydrate into 10 mL of ethylene glycol, and continue stirring until the bismuth nitra...

Embodiment 2

[0059] A kind of bismuth oxychloride / silver / silver ferrite (Bi 12 o 17 Cl 2 / Ag / AgFeO 2 ) ternary composite Z-type photocatalyst, bismuth oxychloride (Bi 12 o 17 Cl 2 ) as a carrier, bismuth oxychloride coated with silver ferrite (AgFeO 2 ), silver elemental (Ag) is loaded on the silver ferrite.

[0060] In this embodiment, the mass percentage of bismuth oxychloride in the bismuth oxychloride / silver / silver ferrite ternary composite Z-type photocatalyst is 15%.

[0061] In this embodiment, bismuth oxychloride has a flake structure; silver ferrite has a granular structure.

[0062] A kind of bismuth oxychloride / silver / silver ferrite (Bi 12 o 17 Cl 2 / Ag / AgFeO 2 ) The preparation method of ternary composite Z type photocatalyst, comprises the following steps:

[0063] (1) Ultrasonic disperse 29.36 mg of the bismuth oxychloride nanosheets in step (1) of Example 1 in 15 mL of deionized water, and ultrasonically disperse for 30 minutes to obtain a bismuth oxychloride dis...

Embodiment 3

[0066] A kind of bismuth oxychloride / silver / silver ferrite (Bi 12 o 17 Cl 2 / Ag / AgFeO 2 ) ternary composite Z-type photocatalyst, bismuth oxychloride (Bi 12 o 17 Cl 2 ) as a carrier, bismuth oxychloride coated with silver ferrite (AgFeO 2 ), silver elemental (Ag) is loaded on the silver ferrite.

[0067] In this embodiment, the mass percentage of bismuth oxychloride in the bismuth oxychloride / silver / silver ferrite ternary composite Z-type photocatalyst is 20%.

[0068] In this embodiment, bismuth oxychloride has a flake structure; silver ferrite has a granular structure.

[0069] A kind of bismuth oxychloride / silver / silver ferrite (Bi 12 o 17 Cl 2 / Ag / AgFeO 2 ) The preparation method of ternary composite Z type photocatalyst, comprises the following steps:

[0070] (1) Ultrasonic disperse 39.14 mg of bismuth oxychloride nanosheets in step (1) of Example 1 in 15 mL of deionized water, and ultrasonically disperse for 30 minutes to obtain a bismuth oxychloride dispers...

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Abstract

The invention discloses a bismuth oxychloride / silver / silver ferrate ternary composite Z-type photocatalyst and its preparation method and application. The photocatalyst uses bismuth oxychloride as a carrier, and is wrapped with silver ferrate. Silver is loaded with silver elements. The preparation method includes the following steps: preparing bismuth oxychloride, Ag + ,Fe 3+ A mixed solution; an in-situ precipitation reaction was used to prepare a bismuth oxychloride / silver ferrite composite; a reduction reaction was used to prepare a bismuth oxychloride / silver / silver ferrite ternary composite Z-type photocatalyst. The photocatalyst of the present invention has the advantages of excellent visible light absorption performance, high photogenerated electron-hole separation efficiency, high photocatalytic activity, strong redox ability, good stability, good corrosion resistance, etc., and can efficiently degrade antibiotic wastewater, and its preparation method It has the advantages of simple synthesis method, low raw material cost, low energy consumption, short time consumption, and easy control of conditions. It is suitable for continuous large-scale batch production and is easy for industrial utilization.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a bismuth oxychloride / silver / silver ferrite ternary composite Z-type photocatalyst and a preparation method and application thereof. Background technique [0002] The application of semiconductor photocatalysts in the degradation of toxic and harmful organic pollutants (such as antibiotics) is of great significance to solve environmental pollution. However, wide bandgap and low quantum efficiency are still the "bottleneck" of photocatalysts. Therefore, it is of great significance to actively develop efficient and renewable photocatalysts with visible light response to fully utilize solar energy. [0003] Silver ferrite (AgFeO 2 ) is a narrow bandgap semiconductor (1.15-1.7eV), which can use a wide range of solar energy spectrum and is easily excited by light to generate carriers to participate in the degradation process of pollutants, but it has electrons and holes that ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/128C02F1/30C02F101/38
CPCB01J27/128C02F1/30C02F2101/38C02F2305/10B01J35/394B01J35/39
Inventor 郭佳茵梁婕袁兴中曾光明蒋龙波于瀚博
Owner HUNAN UNIV