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Synthetic method of visible light catalyst Bi2MoO6

A synthesis method and catalyst technology, applied in the field of photocatalyst synthesis, can solve the problems of complicated synthesis operation, affecting photocatalytic activity, low activity, etc., and achieve the effects of improving photocatalytic activity, good environmental benefits, and enlarging specific surface area.

Inactive Publication Date: 2008-09-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] This method uses Bi(NO 3 ) 3 ·5H 2 O, MoO 3 , NH 3 and HNO 3 As a reactant, a photocatalyst Bi with visible light catalytic activity can be synthesized 2 MoO 6 (bismuth molybdate), but a variety of agents are used in the synthesis, and the synthesis operation is complicated
Moreover, after synthesis, it needs to be calcined before it can be used, which greatly reduces the specific surface area of ​​the catalyst and affects its photocatalytic activity.
[0016] To sum up, the existing methods either need to use a variety of agents, the operation is complicated, and the conditions are harsh, or they need to be calcined to make the synthesized Bi 2 MoO 6 The catalyst has a small specific surface area and low activity

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0040] First weigh 3.57×10 -4 mol (NH 4 ) 6 Mo 7 o 24 4H 2 O and 0.005mol Bi(NO 3 ) 3 ·5H 2 O solid, was added to 35mL of deionized water, stirring constantly with a glass rod. Then place the beaker containing the above mixture on a magnetic stirrer at room temperature and magnetically stir for 30 minutes, place it in an ultrasonic generator, and ultrasonicate for 30 minutes to make the mixture fully mixed. The treated mixture was transferred into a 50mL polytetrafluoroethylene reaction tank, placed in a stainless steel reaction kettle, sealed and placed in an oven. The hydrothermal reaction temperature was 150°C, and the reaction was performed for 24 hours. After 24 hours of hydrothermal reaction, take out the reaction kettle from the oven and wait for it to cool to room temperature, then take out the polytetrafluoroethylene reaction tank to obtain a light yellow precipitate, filter the precipitate through a filter funnel equipped with a 0.45 μm filter membrane, and w...

Embodiment 2

[0042] The hydrothermal reaction was carried out at 160°C, and other synthesis conditions were the same as in Example 1. The obtained catalyst has an average particle size of 31.4nm and a specific surface area of ​​10.4m 2 / g. Weigh 0.200 g of the above catalyst and add it into 100 mL of 4BS solution with an initial concentration of 21.27 mg / L, and the other reaction conditions are the same. After 30min of dark reaction, the concentration of dye 4BS was 4.45mg / L, and after 90min of photocatalytic reaction, the concentration of dye 4BS was 0.12mg / L, and the total removal rate of 4BS reached 99.5%.

Embodiment 3

[0044] The hydrothermal reaction was carried out at 180° C., and other synthesis conditions were the same as in Example 1. The obtained catalyst has an average particle size of 39.1nm and a specific surface area of ​​9.4m 2 / g. Weigh 0.200 g of the above catalyst and add it into 100 mL of 4BS solution with an initial concentration of 22.20 mg / L, and the other reaction conditions are the same. After 30min of dark reaction, the concentration of dye 4BS was 14.67mg / L, and after 90min of photocatalytic reaction, the concentration of dye 4BS was 4.60mg / L, and the total removal rate of 4BS reached 79.2%.

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Abstract

A synthetic method of a novel visible light photocatalyst Bi2MoO6 (bismuth molybdate) is provided. The method includes the following steps: weighing Bi(NO3)3*5H2O and (NH4)6Mo7O24*4H2O solids at the theoretical ratio by mass of 14:1, dispersing the weighed solids into an appropriate amount of deionized water, stirring to obtain white curdy precipitates, placing the precipitates in a magnetic stirrer and stirring at normal temperature for 30 minutes, subjecting to ultrasonic treatment with a ultrasonic generator for 30 minutes to allow intensively mixing, allowing reactions of the treated white precipitates at 150-200 DEG C under sealed conditions, filtering the reaction product to collect flavescent precipitates, washing, drying, and grinding to obtain Bi2MoO6 (bismuth molybdate) photocatalyst. The photocatalyst has good photodegradation effect on target pollutants; and when the temperature of hydrothermal synthesis is 160 DEG C, the removal rate of target pollutant 4BS after photodegradation for 90 minutes reaches 99.5%. The inventive synthetic method has the advantages of simple process and low requirement for equipment, and is suitable for the synthesis of highly-active visible light photocatalyst Bi2MoO6 (bismuth molybdate).

Description

technical field [0001] The present invention relates to the synthesis of a kind of photocatalyst, especially the synthesis of visible light catalyst, specifically a kind of novel visible light catalyst Bi 2 MoO 6 (bismuth molybdate) synthesis method. Background technique [0002] Since the discovery of TiO by Fujishima and Honda in 1972 2 Since single crystal electrodes can not only decompose water but also decompose other substances under the action of light, photocatalytic reactions have received widespread attention in environmental governance and energy development. The research and development of photocatalytic materials has become a hot research topic at home and abroad. . However, most of the reported photocatalysts have low efficiency and wide band gap, and can only show photocatalytic activity in the ultraviolet region. In the solar spectrum, ultraviolet light (below 400nm) is less than 5%, while visible light with a wavelength of 400-750nm Accounted for 43%. T...

Claims

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Application Information

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IPC IPC(8): B01J23/31
Inventor 陈建林姚三丽齐凯高强立刘龙茂许岳泰陈亚
Owner NANJING UNIV
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