Black phosphorus/bismuth tungstate nanocomposite material and its preparation method and application in waste gas treatment

A nanocomposite material, bismuth tungstate technology, applied in separation methods, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of ineffective degradation of nitric oxide, poor effect of harmful gases, difficult regeneration, etc., to achieve Improved photocatalytic performance, beneficial to recycling and reuse, and easy to operate

Active Publication Date: 2021-02-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the continuous development and progress of science, the current methods of treating waste gas include activated carbon adsorption, catalytic combustion, biological filtration, acid-base neutralization, etc., but the above methods are expensive, difficult to regenerate, and can only treat high-concentration waste gas. Exhaust gas, which is extremely ineffective in dealing with low concentrations of harmful gases remaining in the air
However, for the treatment of waste gas at low concentration (ppb, parts per billion level) level, semiconductor photocatalysis is considered as one of the most promising technologies, which has the potential to solve the global energy shortage due to its high efficiency and environmental protection characteristics. However, the effect of the existing treatment agents on the degradation of nitric oxide is far from the expected effect

Method used

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  • Black phosphorus/bismuth tungstate nanocomposite material and its preparation method and application in waste gas treatment
  • Black phosphorus/bismuth tungstate nanocomposite material and its preparation method and application in waste gas treatment
  • Black phosphorus/bismuth tungstate nanocomposite material and its preparation method and application in waste gas treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of two-dimensional black phosphorus material, the specific steps are as follows:

[0033] Disperse 20 mg of bulk black phosphorus material into 30 milliliters of N-methylpyrrolidone, and use a cell pulverizer to ultrasonically pulverize for 8 hours with a power of 120 watts to obtain a two-dimensional black phosphorus sheet. N - Methylpyrrolidone solution. attached figure 1 And attached figure 2 They are the SEM image and TEM image of the two-dimensional black phosphorus sheet respectively. It can be seen from the pictures that the black phosphorus presents a thin sheet structure.

[0034] The preparation of two-dimensional bismuth tungstate flakes, the specific steps are as follows:

[0035] Disperse 165 mg of sodium tungstate and 485 mg of bismuth nitrate pentahydrate into 40 ml of deionized water, ultrasonically disperse them for 5 minutes, and then add 50 mg of cetyl trimethyl bromide to the mixed solution Ammonium, stirred at room temperature f...

Embodiment 2

[0038] The photocatalytic degradation of nitric oxide gas, the specific steps are as follows:

[0039]A batch reactor (volume of 2.2 liters) containing a quartz glass is used for the photocatalytic degradation of nitric oxide; 80 mg of the black phosphorus / bismuth tungstate nanocomposite prepared in Example 1 are placed in the batch reactor, Close the hatch, evacuate the reactor, adjust the flow rate of high-purity air (1 liter) and nitric oxide (concentration of 10 ppm), so that the flow rate of the mixed gas is 1.2 liters per minute, and the concentration of nitric oxide is stabilized at 600 Fifteen minutes after ppb, turn on the xenon lamp light source to start the photodegradation reaction; the black phosphorus / bismuth tungstate nanocomposite photocatalyst can be recycled many times and has good stability. Good catalytic effect.

[0040] attached Figure 7 Photocatalytic degradation of nitric oxide effect diagram for black phosphorus / bismuth tungstate nanocomposite; att...

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Abstract

The invention discloses a black phosphorus/bismuth tungstate nano-composite material, a preparation method thereof, and an application thereof in waste gas treatment. The method comprises the following steps: stripping a block black phosphorus material by a solvent stripping process to form two-dimensional black phosphorus slices; preparing two-dimensional bismuth tungstate nanosheets under hydrothermal conditions with bismuth nitrate and sodium tungstate as precursors and cetyltrimethylammonium bromide as a dispersant; and modifying the surface of the black phosphorus slices with the bismuthtungstate nanosheets to form a perfect heterojunction structure in order to obtain the black phosphorus/bismuth tungstate nano-composite material. The black phosphorus/bismuth tungstate nano-compositematerial synthesized by above simple steps has an excellent photocatalytic effect on the treatment of waste gas, and can be recycled many times; and the nano-composite material also has the advantages of simple preparation process, easiness in recycling and multiple utilization, and good industrial application prospect in waste gas treatment.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a nanocomposite material based on black phosphorus / bismuth tungstate, its preparation method and its application in photocatalytic treatment of exhaust gas. Background technique [0002] Atmospheric pollution is one of the huge problems facing our country at present. With the development of our country's economy, photochemical smog, smog and PM 2.5 (PM is particulate matter) are becoming more and more serious, causing huge damage to people's daily life and physical health. influences. Air pollution is mainly divided into outdoor and indoor pollutants. Outdoor air pollutants mainly include inhalable particulate matter, nitrogen oxides, sulfur dioxide, and carbon monoxide, while indoor air pollutants mainly include formaldehyde, toluene, and hydrocarbons. At present, with the rapid increase in the number of automobiles in our country, the emission of automobile exhaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/188B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01D2255/802B01J27/188B01J35/004B01J35/1004
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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