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
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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 durin

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
CPCB01J23/8876B01J35/004B01J35/02
Inventor 郁桂云戴勇胡峰献
Owner YANCHENG INST OF TECH
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