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Preparation method for high-concentration nanometer red-phosphorus photocatalyst dispersion

A technology of photocatalysts and dispersions, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of unfavorable surface catalytic reactions, difficulty in obtaining nanoparticles, small specific surface area, etc., and achieve specific surface area High, simple method, fast separation effect

Active Publication Date: 2017-07-21
NORTHWEST UNIV
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Problems solved by technology

Although red phosphorus is chemically stable at room temperature (insoluble in water, not spontaneously combustible in air), it is easy to catch fire at high temperature, and heat, friction and impact should be avoided during processing, so that almost all preparation methods of red phosphorus use hydrothermal method or mechanical grinding method (requires inert medium protection), it is difficult to obtain nanoparticles, and the products are mostly micron or submicron particles, with small specific surface area, which is not conducive to the surface catalytic reaction

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  • Preparation method for high-concentration nanometer red-phosphorus photocatalyst dispersion
  • Preparation method for high-concentration nanometer red-phosphorus photocatalyst dispersion
  • Preparation method for high-concentration nanometer red-phosphorus photocatalyst dispersion

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preparation example Construction

[0028] The preparation method of the high-concentration nanometer red phosphorescent catalyst dispersion liquid of the present invention comprises the following steps:

[0029] Step 1: Grinding red phosphorus in water and sieving to obtain micron-sized red phosphorus particles;

[0030] Step 2: heat-treating the obtained micron-sized red phosphorus particles in a solvent at a temperature of 160-220°C for 3-72 hours;

[0031] The solvent is a mixed solution of water, ethylene glycol or glycerol and NaOH, wherein: the volume ratio of water to ethylene glycol or glycerol is 11:1 to 3:1, and the concentration of NaOH is 0.05 to 0.20mol / L;

[0032] Step 3: centrifuging, washing, drying, and annealing the heat-treated red phosphorus to obtain nano-scale red phosphorus;

[0033] Step 4: Dispersing the obtained nano-scale red phosphorus in water and ultrasonically treating it to obtain a nano-red phosphorescent catalyst dispersion;

[0034] Wherein, in Step 3, the centrifugal spee...

Embodiment 1

[0042] At room temperature, commercially available red phosphorus was ground in water, sieved with a 120-mesh sieve, and dried to obtain micron-sized red phosphorus particles. Weighed 3 g and dispersed it in a reaction mixture consisting of 55 mL of water, 5 mL of ethylene glycol, and 0.12 g of NaOH. solution, stirred for 30 minutes, transferred to a 100mL hydrothermal synthesis reaction tank with polytetrafluoroethylene lining, sealed and placed in a blast drying oven, heated at 5°C / min to 200°C for 24h, and cooled naturally after the reaction was completed To room temperature, the product was repeatedly washed with distilled water and absolute ethanol, centrifuged (12000rmp / min), dried at 80°C, annealed at 380°C for 1h under the protection of argon, and finally, 1.0g of the product was dispersed in 500mL In water, 300W, 20KHz ultrasound was used for 10h to obtain a high-concentration nanometer red phosphorescent catalyst dispersion. Take 6 mL of nano-red phosphorus dispersio...

Embodiment 2

[0044]At room temperature, commercially available red phosphorus was ground in water, sieved with a 120-mesh sieve, and dried to obtain micron-sized red phosphorus particles. Weighed 3 g and dispersed it in a reaction mixture consisting of 45 mL of water, 15 mL of ethylene glycol, and 0.48 g of NaOH. solution, stirred for 30 minutes, transferred to a 100mL hydrothermal synthesis reaction tank with polytetrafluoroethylene lining, sealed and placed in a blast drying oven, heated at 5°C / min to 160°C for 12h, and cooled naturally after the reaction was completed To room temperature, the product was repeatedly washed with distilled water and absolute ethanol, centrifuged (8000rmp / min), dried at 50°C, annealed at 350°C for 2h under the protection of argon, and finally, 1.0g of the product was dispersed in 500mL In water, use 800W, 20KHz ultrasound for 2h to obtain a high-concentration nanometer red phosphorescent catalyst dispersion. Take 6 mL of nano-red phosphorus dispersion and a...

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Abstract

The invention discloses a preparation method for a high-concentration nanometer red-phosphorus photocatalyst dispersion. The preparation method comprises the following steps: grinding commercially available red phosphorus in water and carrying out screening with a screen mesh so as to obtain micron-size red phosphorus particles; subjecting the micron-size red phosphorus particles to solvent-thermal treatment; successively carrying out centrifugation, washing, drying and annealing so as to obtain a nanometer red-phosphorus photocatalyst; and dispersing the nanometer red-phosphorus photocatalyst in water and carrying outultrasonic treatment so as to obtain the nanometer red-phosphorus photocatalyst dispersion. The dispersion is simple to prepare and good in stability and can be stably stored for a long time; and the obtained nanometer red-phosphorus photocatalyst has a layered pore channel structure, high specific area, good recyclability, and good capacity in photocatalytic water splitting for hydrogen production and photodegradation of organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, and in particular relates to a method for preparing a high-concentration nanometer red phosphorescent catalyst dispersion. Background technique [0002] As a green catalytic technology, semiconductor photocatalysis technology has become one of the important technologies to solve energy and environmental problems. 2 , Pollutant degradation and other fields have shown good application prospects. Throughout the development of photocatalytic technology, it is actually the research and development process of high-efficiency photocatalysts. The development of efficient, stable and clean photocatalysts has always been the core of photocatalytic technology research. Titanium dioxide (TiO 2 ) as a representative of the classic semiconductor and stone-ground carbon nitride (g-C 3 N 4 ) is a new type of non-metallic photocatalytic material, because of their stable physical and chemical...

Claims

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Application Information

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IPC IPC(8): B01J27/14C02F1/30C01B3/04C02F101/30
CPCC01B3/042C02F1/30B01J27/14C01B2203/0277C01B2203/1041C02F2101/308B01J35/39B01J35/27Y02E60/36
Inventor 刘恩周戚露露樊君胡晓云苗慧张德恺樊安姜振益
Owner NORTHWEST UNIV
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