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Core-shell structure photocatalyst and its preparation method and application

A technology of photocatalyst and core-shell structure, applied in the field of core-shell structure photocatalyst and its preparation, can solve the problems of difficult recycling and reuse of photocatalyst, low electron-hole separation rate, difficulty in separation and recycling, etc., so as to improve photocatalysis performance, improving compounding rate, and increasing the effect of specific surface area

Active Publication Date: 2021-04-20
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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  • Core-shell structure photocatalyst and its preparation method and application
  • Core-shell structure photocatalyst and its preparation method and application
  • Core-shell structure photocatalyst and its preparation method and application

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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 core-shell structure photocatalyst, a preparation method and application thereof, and belongs to the technical field of visible light photocatalysis. The invention provides a photocatalyst with a core-shell structure, the photocatalyst uses Fe 3 o 4 as the nucleus, Fe 3 o 4 The core is coated with NiAl‑LDHs layer to form Fe 3 o 4 @LDHs, Fe 3 o 4 @LDHs coated with Bi 2 MoO 6 Floor. The photocatalyst uses Fe 3 o 4 As a nucleus, it can improve the current situation of hydrotalcite accumulation and superposition, and expose more active sites. NiAl‑LDHs and Bi 2 MoO 6 Composite to form heterojunction materials, improve Bi 2 MoO 6 The photocatalytic performance can be adjusted to adjust the bandgap width of the two, so that it has a dual UV-visible response, and can more effectively improve the recombination rate of photogenerated holes and electrons. The photocatalyst has high stability and degradation rate for degrading organic pollutants, and can be cycled for more than 5 times without obvious activity decline.

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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Patent Type & Authority Patents(China)
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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