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Hydrotalcite and bismuth molybdate heterojunction composite photocatalyst as well as preparation method and application thereof

A technology of bismuth molybdate and heterojunction, which is applied in the field of photocatalysis, can solve the problems of low electron-hole separation rate, high recombination rate, no photocatalytic activity and poor effect of photocatalyst, so as to improve the recombination rate and separation. Degree, uniform distribution, full contact effect

Active Publication Date: 2019-02-12
YANCHENG INST OF TECH
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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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  • Hydrotalcite and bismuth molybdate heterojunction composite photocatalyst as well as preparation method and application thereof
  • Hydrotalcite and bismuth molybdate heterojunction composite photocatalyst as well as preparation method and application thereof
  • Hydrotalcite and bismuth molybdate heterojunction composite photocatalyst as well as preparation method and application thereof

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 as well as a preparation method and application thereof. The catalyst is formed by assembling and compounding nickel-aluminum hydrotalcite nanosheets and bismuth molybdate nanosheets layer-by-layer by virtue of the interlayer electrostatic effect through a hydrothermal method. The preparation methodcomprises the following steps: firstly preparing Bi2MoO6; secondarily synthesizing a Bi2MoO6 / NiAl-LDH semiconductor composite material: weighing Bi2MoO6 according to a formula, dissolving the weighedBi2MoO6 in water, and ultrasonically processing for standby use; then weighing Ni(NO3)2-6H2O and Al(NO3)3-9H2O according to a molar ratio of 2 to 1, adding a chelating agent, dissolving in water, andadjusting the pH to be alkaline by using CH4N2O; uniformly mixing and stirring the two solutions, adding the mixed solution into a reaction kettle, and heating and reacting for 48 hours at 100 to 150DEG C; after the reaction is ended, naturally cooling to the room temperature, centrifuging, washing, and drying to obtain the hydrotalcite and bismuth molybdate heterojunction composite photocatalyst. The semiconductor composite material is high in catalytic activity under the visible light; the lamellar self-assembling synthetic method has certain instruction significance for the synthesis andapplication 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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IPC IPC(8): B01J23/31C02F1/30C02F101/30
CPCC02F1/30B01J23/31C02F2101/308B01J35/39
Inventor 郁桂云胡丰献戴勇
Owner YANCHENG INST OF TECH
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