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Photocatalyst of shell-core structure as well as preparation method thereof and application thereof

A technology of photocatalyst and core-shell structure is applied in the field of core-shell structure photocatalyst and its preparation, which can solve the problems of increased use cost, high recombination rate, and difficulty in recycling and reusing photocatalyst.

Active Publication Date: 2018-11-23
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the most widely used semiconductor photocatalyst at home and abroad is TiO 2 , but it is a wide-bandgap semiconductor, and it can only produce photocatalytic activity under the irradiation of ultraviolet light (only 4% of solar radiation), which limits TiO to a large extent. 2 application, and powdered TiO 2 There is a problem of difficulty in separation and recovery during use
In recent years, photocatalyst research has begun to develop new photocatalytic materials with visible light response. However, such catalysts often have low electron-hole separation rate and high recombination rate, and are difficult to recycle and reuse, which increases the cost of use.
[0004] Moreover, this photocatalyst is difficult to recycle and reuse, which increases the cost of use.

Method used

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  • Photocatalyst of shell-core structure as well as preparation method thereof and application thereof
  • Photocatalyst of shell-core structure as well as preparation method thereof and application thereof
  • Photocatalyst of shell-core structure as well as preparation method thereof and application thereof

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Embodiment approach

[0092] As a preferred embodiment of the present invention, the Fe 3 o 4 The weight ratio with NiAl-LDHs is 1:2.5-5; the Fe 3 o 4 @LDHs with Bi 2 MoO 6 The weight ratio is 1-1.5:2.5.

[0093] In a preferred embodiment of the present invention, Examples 2, 3, 8, and 10 of the present invention are adjusted by Fe 3 o 4 The weight ratio with NiAl-LDHs is 1:2.5-5, and the adjustment of Fe 3 o 4 @LDHs with Bi 2 MoO 6 The weight ratio is 1-1.5:2.5, further enhances its photocatalytic activity, in photocatalytic experiment, after 150min, the methylene blue remaining amount of embodiment 2,3,8,10 is all below 42%, especially embodiment In 3, only 28% of the methylene blue remains, and the obtained photocatalyst has high stability and degradation rate while being cost-effective.

[0094] According to another aspect of the present invention, the present invention provides the preparation method of described core-shell structure photocatalyst, comprises the following steps:

...

Embodiment 1

[0163] 1. Synthesis of core-shell structured photocatalysts

[0164] (1) Synthesis of Fe 3 o 4

[0165] Weigh 1.35g of FeCl 3 ·H 2 O, 3.6g NaAc, 1g polyethylene glycol, and 60mL ethylene glycol were put into a three-necked flask with a capacity of 250mL, and after ultrasonic mixing at room temperature for 15min, the mother liquor was transferred to a hydrothermal kettle, and placed in an oven at 200°C with water Heat for 10 hours.

[0166] After 10h, the hydrothermal kettle was taken out from the oven and cooled. After being cooled to room temperature, it was centrifuged with a centrifuge (10000r / min, 3min), washed repeatedly with distilled water for 3 times, and then washed once with ethanol to remove the supernatant. The sample was dried; after drying, it was ground into powder for later use.

[0167] (2) Synthesis of Fe 3 o 4 @LDHs

[0168] Weigh 0.1g of Fe 3 o 4 , use a pipette to pipette 20mL of prepared Ni 2+ 、Al 3+ Ionic solution (Ni 2+ Nickel nitrate aqueou...

Embodiment 2-14

[0182] Fe in step (2) 3 o 4 、Ni 2+ with Al 3+ Ionic solution, concentration are the addition of the NaOH aqueous solution of 1M as shown in table 1, in step (3), Fe 3 o 4 @LDHs, 0.4M Bi(NO 3 ) 3 Aqueous solution, 0.2M Na 2 MoO 4 The add-on of solution water is as shown in table 1, and all the other reaction raw materials and conditions are similar to embodiment 1.

[0183] The addition of part raw material in the embodiment 2-14 of table 1

[0184]

[0185]

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Abstract

The invention discloses a photocatalyst of a shell-core structure as well as a preparation method thereof and application thereof, and belongs to the technical field of visible light photocatalysis. The photocatalyst of the shell-core structure takes Fe3O4 as the core, a NiAl-LDHs layer is coated outside the Fe3O4 core to form Fe3O4@LDHs, and a Bi2MoO6 layer is coated outside the Fe3O4@LDHs. The photocatalyst takes Fe3O4 as the core, and can improve a current condition of stacking and superposing hydrotalcite to epose more active sites. The NiAl-LDHs is compounded with Bi2MoO6 to form a heterojunction material, so that photocatalytic performance of Bi2MoO6 is improved, and forbidden bandwidth of the two is regulated, and therefore, the photocatalyst has ultraviolet-visible dual response, and can effectively improve a compounding rate of a photogenerated hole and electrons. The photocatalyst has very high stability and a very high degradation rate of degrading organic pollutants, and isnot obviously reduced in activity after being circulated for more than 5 times.

Description

technical field [0001] The invention belongs to the technical field of visible light photocatalysis, and in particular relates to a core-shell structure photocatalyst and a preparation method and application thereof. Background technique [0002] As the global environmental pollution is becoming more and more serious, environmental problems are getting more and more attention. As a new catalytic material, semiconductor photocatalyst has broad application prospects in the field of pollutant treatment. [0003] At present, the most widely used semiconductor photocatalyst at home and abroad is TiO 2 , but it is a wide-bandgap semiconductor, and it can only produce photocatalytic activity under the irradiation of ultraviolet light (only 4% of solar radiation), which limits TiO to a large extent. 2 application, and powdered TiO 2 There is the problem of difficulty in separation and recovery during use. In recent years, photocatalyst research has begun to develop new photocata...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J35/00B01J35/02
CPCB01J23/8876B01J35/00B01J35/30B01J35/39
Inventor 郁桂云戴勇胡峰献
Owner YANCHENG INST OF TECH
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