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A kind of hydrotalcite and bismuth molybdate heterojunction composite photocatalyst and its preparation method and application

A technology of bismuth molybdate and heterojunction, which is applied in the field of photocatalysis, can solve the problems of poor photocatalytic activity, high recombination rate, and low electron-hole separation rate of photocatalyst, so as to improve the recombination rate and separation rate. Degree, uniform distribution, full contact effect

Active Publication Date: 2021-10-29
江苏胜德龙机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, photocatalysts have the following disadvantages: first: only absorb ultraviolet light; second: low electron-hole separation rate and high recombination rate of photocatalysts
However, LDHs themselves have no photocatalytic activity or poor effect

Method used

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  • A kind of hydrotalcite and bismuth molybdate heterojunction composite photocatalyst and its preparation method and application
  • A kind of hydrotalcite and bismuth molybdate heterojunction composite photocatalyst and its preparation method and application
  • A kind of hydrotalcite and bismuth molybdate heterojunction composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step (1) synthesis of Bi 2MoO 6

[0040] Weigh 6mmol Bi(NO 3 ) 3 ·5H 2 O, 3 mmol Na 2 MoO 4 2H 2 O into a 100mL beaker, then add 60mL of distilled water and 2mL of HNO 3 Dissolve with magnetic stirring, adjust the pH of the solution to 5 with 2M NaOH solution, stir magnetically at room temperature for 30 min, put it into an 80 mL stainless steel reaction kettle, and heat it in an oven at 180 °C for 24 h. After the reaction, it was naturally cooled to room temperature, centrifuged, washed with distilled water and ethanol, and the sample was placed in a drying oven at 80°C for 12 hours.

[0041] Step (2) synthesizes Bi 2 MoO 6 / NiAl-LDH semiconductor composite material (Bi 2 MoO 6 / LDH-5%)

[0042] Weigh 1.5g Bi 2 MoO 6 Powder, put into a 100mL beaker containing 60mL distilled water and sonicate for 1h. Then, 0.5mmol Ni(NO 3 ) 2 ·6H 2 O, 0.25mmol Al(NO 3 ) 3 9H 2 O, 8 mmol NH 4 F, 15 mmol CH 4 N 2 O was added to a 50mL beaker containing 20mL of di...

Embodiment 2

[0046] Step (1) synthesis of Bi 2 MoO 6

[0047] Weigh 6mmol Bi(NO 3 ) 3 ·5H 2 O, 3 mmol Na 2 MoO 4 2H 2 O into a 100mL beaker, then add 60mL of distilled water and 2mL of HNO 3 Dissolve with magnetic stirring, adjust the pH of the solution to 5 with 2M NaOH solution, stir magnetically at room temperature for 30 min, put it into an 80 mL stainless steel reaction kettle, and heat it in an oven at 180 °C for 24 h. After the reaction, it was naturally cooled to room temperature, centrifuged, washed with distilled water and ethanol, and the sample was placed in a drying oven at 80°C for 12 hours.

[0048] Step (2) synthesizes Bi 2 MoO 6 / NiAl-LDH semiconductor composite material (Bi 2 MoO 6 / LDH-10%)

[0049] Weigh 1.5g Bi 2 MoO 6 Powder, put into a 100mL beaker containing 60mL distilled water and sonicate for 1h. Then, 1mmol Ni(NO 3 ) 2 ·6H 2 O, 0.5mmol Al(NO 3 ) 3 9H 2 O, 8 mmol NH 4 F, 15 mmol CH 4 N 2 O was added to a 50mL beaker containing 20mL of dis...

Embodiment 3

[0051] Step (1) synthesis of Bi 2 MoO 6

[0052] Weigh 6mmol Bi(NO 3 ) 3 ·5H 2 O, 3 mmol Na 2 MoO 4 2H 2 O into a 100mL beaker, then add 60mL of distilled water and 2mL of HNO 3 Dissolve with magnetic stirring, adjust the pH of the solution to 5 with 2M NaOH solution, stir magnetically at room temperature for 30 min, put it into an 80 mL stainless steel reaction kettle, and heat it in an oven at 180 °C for 24 h. After the reaction, it was naturally cooled to room temperature, centrifuged, washed with distilled water and ethanol, and the sample was placed in a drying oven at 80°C for 12 hours.

[0053] Step (2) synthesizes Bi 2 MoO 6 / NiAl-LDH semiconductor composite material (Bi 2 MoO 6 / LDH-15%)

[0054] Weigh 1.5g Bi 2 MoO 6 Powder, put into a 100mL beaker containing 60mL distilled water and sonicate for 1h. Then, 1.5mmol Ni(NO 3 ) 2 ·6H 2 O, 0.75mmol Al(NO 3 ) 3 9H 2 O, 8 mmol NH 4 F, 15 mmol CH 4 N 2 O was added to a 50mL beaker containing 20mL of ...

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Abstract

The invention discloses a hydrotalcite and bismuth molybdate heterojunction composite photocatalyst and its preparation method and application. The catalyst uses a hydrothermal method to combine nickel-aluminum hydrotalcite nanosheets and bismuth molybdate nanosheets by means of electrostatic interaction between layers. Composite formation of layer-by-layer assembly; the preparation method includes the following steps: first prepare Bi 2 MoO 6 ; Second synthesis of Bi 2 MoO 6 / NiAl‑LDH semiconductor composite material: weigh Bi according to the formula 2 MoO 6 , add water to dissolve, and use after ultrasonic treatment; then weigh Ni(NO 3 ) 2 •6H 2 O and Al(NO 3 ) 3 •9H 2 O, then add chelating agent, add water to dissolve, use CH 4 N 2 O to adjust the pH to alkaline; then mix and stir the above two solutions evenly, add to the reaction kettle, heat and react at 100-150°C for 48 h; after the reaction, naturally cool to room temperature, centrifuge, wash, and dry to obtain the product. This semiconductor composite material has high catalytic activity under visible light; and the synthesis method of this sheet self-assembly has certain guiding significance for the synthesis and application of other photocatalysts.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a hydrotalcite and bismuth molybdate heterojunction composite photocatalyst, a preparation method and application thereof. Background technique [0002] Currently, the most widely used photocatalyst is TiO 2 , but it is a wide bandgap semiconductor and only uses the ultraviolet part of sunlight. In recent years, photocatalyst research has mainly focused on two aspects: one is the 2 The photocatalyst is modified to have photocatalytic activity in the visible light region; the second is to develop new photocatalytic materials with visible light response. Generally, photocatalysts have the following disadvantages: first, they only absorb ultraviolet light; second, they have low electron-hole separation rate and high recombination rate. Therefore, the development of photocatalysts with visible light response and reduced electron-hole recombination rate has become an urgen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C02F1/30C02F101/30
CPCB01J23/31B01J35/004C02F1/30C02F2101/308
Inventor 郁桂云胡丰献戴勇
Owner 江苏胜德龙机电科技有限公司
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