Supported two-dimensional layered molybdenum sulfide composite material and preparation method and application thereof

A two-dimensional layered and composite material technology, which is applied in the preparation of organic compounds, preparation of amino hydroxyl compounds, chemical instruments and methods, etc., can solve the problems of negative impact on catalytic activity, reduced catalyst activity, high economic cost, etc., to avoid catalyst Effects of poisoning, avoiding reduction in catalytic activity, and improving catalytic efficiency

Inactive Publication Date: 2016-06-15
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the surface Raman enhancement effect, near-infrared photothermal therapy effect and its unique size effect, noble metal nanomaterials have become one of the research hotspots in recent years. Due to the high economic cost of most noble metals, researchers usually use noble metal nanomaterials Particles are dispersed on a special carrier with a large specific surface area and good adsorption function to realize the effective dispersion of noble metal particles. In this supported catalyst system, the metal active component and the carrier together constitute the whole of the catalyst. The carrier is mainly Stretcher the metal active particles on the skeleton of the carrier to prevent the dissociation between the formed metal particles and lead to the agglomeration between the metal particles, resulting in a decrease in the activity of the catalyst, which in turn has a negative impact on the catalytic activity

Method used

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  • Supported two-dimensional layered molybdenum sulfide composite material and preparation method and application thereof
  • Supported two-dimensional layered molybdenum sulfide composite material and preparation method and application thereof
  • Supported two-dimensional layered molybdenum sulfide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Dissolve 1mmol of ammonium molybdate in 35ml of deionized water and stir for 5min until all is dissolved to form a uniform and transparent solution A.

[0032] 2) Add 30mmol of thiourea to solution A, and stir for 30min to mix uniformly to form a uniform light blue solution B.

[0033] 3) Transfer the above-mentioned solution B to a 50mL polytetrafluoroethylene lined reaction kettle, raise the temperature to 220°C, the constant temperature time is 24h, and then naturally cool to room temperature.

[0034] 4) After centrifugal separation at 9000 r / min for 15 minutes, the obtained black mixed liquid is washed three times with distilled water and absolute ethanol, and the obtained black product is dried at 80° C. to obtain the ultra-thin molybdenum sulfide nanosheet material.

Embodiment 2

[0036] 1) Using the ultra-thin molybdenum sulfide nanosheets obtained in Example 1 as a carrier template, add 95 mg of the ultra-thin molybdenum sulfide nanosheets to a mixed solution of 20 mL of deionized water and absolute ethanol, where deionized water and The volume ratio of water to ethanol is 1:1, and then 1 mL of 5 mg / L nitric acid solution is added, the above-mentioned mixed liquid is sonicated for 30 minutes, and then stirred in a dark room for 30 minutes to form a uniformly mixed suspension A.

[0037] 2) Transfer the above-mentioned suspension liquid A to the quartz test tube of the photochemical reactor, and under the condition of stirring, use a mercury lamp with a power of 500W to irradiate with ultraviolet light for 4h to reduce to obtain a black mixed liquid B.

[0038] 3) After the obtained black mixed liquid product B is centrifuged at 9000r / min for 15min, it is washed three times with deionized water and absolute ethanol, and the obtained black product is dried at...

Embodiment 3

[0044] 1) Using the ultra-thin molybdenum sulfide nanosheets obtained in Example 1 as a carrier template, add 95 mg of the ultra-thin molybdenum sulfide nanosheets to 20 mL of a mixed solution of deionized water and ethanol, where the volume of deionized water and ethanol The ratio is 1:1, and then 1 mL of 5 mg / L sodium chloroaurate solution is added, the above-mentioned mixed liquid is sonicated for 30 minutes, and then stirred in a dark room for 30 minutes to form a uniformly mixed suspension A.

[0045] 2) Transfer the above-mentioned suspension liquid A to the quartz test tube of the photochemical reactor, and under the condition of stirring, use a mercury lamp with a power of 500W to irradiate with ultraviolet light for 4h to reduce to obtain a black mixed liquid B. 3) After centrifugation at 9000r / min for 15 minutes, the mixture product obtained above is washed three times with distilled water and absolute ethanol, and the resulting black product is dried at 80℃ to obtain Au...

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Abstract

The invention belongs to a loaded two-dimensional layered molybdenum sulfide composite material, and discloses a composite nano catalytic material loaded with precious metals (Ag, Au) and its application in catalytic reduction of p-nitrophenol. The present invention adopts a two-step synthesis technique, first using a hydrothermal method to synthesize molybdenum sulfide nanosheets with a porous and ultra-thin structure, and then using ultraviolet light reduction technology to load noble metal nanoparticles onto the two-dimensional layered compound molybdenum sulfide with a sandwich structure On the surface, combining the nano-confined growth effect can effectively avoid the agglomeration phenomenon in the preparation process of noble metals, and finally obtain noble metal nanoparticles with uniform size distribution. In this supported catalyst system, the metal catalytic active center and the carrier jointly constitute the catalyst, due to the localized surface plasmon resonance effect of the noble metal active component and the synergistic effect between the noble metal active component and the carrier.

Description

Technical field [0001] The invention belongs to the field of nano material preparation technology and energy environmental protection, and specifically relates to a new type of noble metal-loaded composite nano catalyst and its application in catalyzing the reduction of p-nitrophenol (4-NP). Background technique [0002] With the rapid economic development, a large number of pollutants generated in industrial and agricultural production have caused great pollution to the water body and the ecological environment, making the current water shortage phenomenon and the environmental crisis more severe, and causing organic water pollution. There are 1,000 kinds of pollutants added every year, among which phenolic substances are the most harmful. P-nitrophenol is a kind of phenolic organic pollutant which is extremely difficult to deal with in industry. It is easily absorbed by human skin tissues and lungs, and will bring great harm to human body and the ecological environment. Animal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/10C07C213/02C07C215/76C02F1/70C02F101/38
CPCB01J27/051B01J35/006B01J35/0073B01J35/1014B01J35/1061B01J35/1066C02F1/70C02F2101/38C07C213/02C07C215/76
Inventor 李东升胡付超乔秀清赵君吴亚盘董文文
Owner CHINA THREE GORGES UNIV
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