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Heterogeneous p-n knot nano composite material and preparation method and application thereof

A nanocomposite material and composite material technology are applied in the field of heterogeneous p-n junction nanocomposite materials and their preparation, which can solve problems such as low electron-hole separation efficiency, avoid photocorrosion, improve photocatalytic efficiency and utilize solar energy. rate, the effect of excellent performance

Active Publication Date: 2015-04-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a heterogeneous p-n junction nanocomposite material and its preparation method and application. The heterogeneous p-n junction nanocomposite material can be directly used to solve the decomposition of organic matter under visible light, the inactivation of microbial pathogens and the high efficiency of solar energy. The problem of utilization, especially the problem of low electron-hole separation efficiency of single-component photocatalyst materials

Method used

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  • Heterogeneous p-n knot nano composite material and preparation method and application thereof
  • Heterogeneous p-n knot nano composite material and preparation method and application thereof
  • Heterogeneous p-n knot nano composite material and preparation method and application thereof

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Embodiment 1

[0041] With cuprous oxide nanospheres as the core, the surface is modified with nanoscale island-shaped titanium dioxide heterogeneous p-n junctions, and the preparation process of Ti:Cu molar ratio is 5% is as follows:

[0042] 1. Mix 0.2g polyvinylpyrrolidone k30, 34mg CuCl 2 2H 2 O was dissolved in 100mL deionized water, under the action of magnetic stirring, 3.6mL of 8g / L sodium hydroxide aqueous solution was added dropwise to the above solution at a rate of one drop per second, stirred for 5min, and then 4mL of 17.6g / L L ascorbic acid aqueous solution was added dropwise to the above solution at a rate of one drop every three seconds, stirred for 5 minutes and then centrifuged. During this process, the cuprous oxide nanoparticles obtained at 20°C were spherical, and at 35°C they were cubes with a size of about 100nm.

[0043] 2. Wash the cuprous oxide nanoparticles obtained in step 1 alternately with deionized water and absolute ethanol for 5 times, and wash with deionize...

Embodiment 2

[0052] With cuprous sulfide nanospheres as the core, the surface is modified with nanoscale island-shaped titanium dioxide heterogeneous p-n junctions, and the preparation process of Ti:Cu molar ratio is 10% is as follows:

[0053] 1. Mix 0.2g polyvinylpyrrolidone k30, 34mg CuCl 2 2H 2 O was dissolved in 100mL deionized water, under the action of magnetic stirring, 3.6mL of 8g / L sodium hydroxide aqueous solution was added dropwise to the above solution at a rate of one drop per second, stirred for 5min, and then 4mL of 17.6g / L L ascorbic acid aqueous solution was added dropwise to the above solution at a rate of one drop every three seconds, stirred for 5 minutes and then centrifuged. During this process, the cuprous oxide nanoparticles obtained at 20°C were spherical, and at 35°C they were cubes, with a size of about 100nm.

[0054] 2. Alternately wash the cuprous oxide nanoparticles obtained in 1 with deionized water and absolute ethanol for 3 times, and then ultrasonically...

Embodiment 3

[0064] The preparation process of the heterogeneous p-n junction with cadmium sulfide as the core and surface modified zinc oxide, and the molar ratio of Zn:Cd is 30% is as follows:

[0065] 1. First, dissolve 1.5mmol of cadmium acetate in 40mL of deionized water in a water bath at 80°C to make a cadmium acetate solution. Then, under magnetic stirring, add 10-20mL of sodium sulfide aqueous solution with a concentration of 15.6g / L Add it dropwise into cadmium acetate solution, react for 30 minutes, and centrifuge to obtain cadmium sulfide nanoparticles.

[0066] 2. The cadmium sulfide nanoparticles obtained in step 1 were alternately washed 5 times with deionized water and absolute ethanol, and the washed cadmium sulfide nanoparticles were immediately dispersed in 10 mL of absolute ethanol, and ultrasonically dispersed for 10 minutes to obtain solution A.

[0067] 3. Dissolve 0.219g of zinc acetate in 10ml of deionized water to make solution B. According to the loading capacity...

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Abstract

The invention discloses a p-n knot nano composite material in a special structure and a preparation method and application thereof, and belongs to the technical field of preparation of inorganic non-metal nano materials, environmental protection and solar energy utilization. The p-n knot material is a surface-modified (partially wrapped) nanoscale large energy gap n type semiconductor material (titanium dioxide, zinc oxide, stannic oxide and the like) by taking a low energy gap p type semiconductor material (cuprous oxide, cuprous sulfide, cadmium sulfide and the like) in a low-dimensional nano structure (spherical, polyhedral, linear and the like) as the inner core. By adopting a method of controlling hydrolysis of a metal salt, a lot of heterogeneous p-n knots are constructed on the surface of low energy gap p type semiconductor material in the low-dimensional nano structure. The p-n knot nano composite material can be directly used for solving the problem of decomposition of organic matters under visible lights, deactivation of microbial pathogens and efficient utilization of solar energy, particular the problem of low electron-hole separation efficiency of a single-component photocatalyst material.

Description

technical field [0001] The invention relates to the fields of preparation of inorganic non-metallic nanomaterials, environmental protection technology and solar energy utilization technology, in particular to a heterogeneous p-n junction nanocomposite material and its preparation method and application. Background technique [0002] Energy crisis and environmental pollution are two major problems faced by human beings in today's era. Photocatalytic technology can oxidize and mineralize almost any organic molecule into carbon dioxide and inorganic ions because it can effectively use solar energy, and degrade organic pollutants in water. The elimination of microorganisms such as bacteria and viruses in water has received widespread attention. Among many photocatalysts, some n-type semiconductors with wide bandgap, such as titanium dioxide, zinc oxide, and tungsten oxide, are widely used in photolysis of water to produce hydrogen, fields such as solar cells and environmental r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J27/04A62D3/17A01N59/20A01N59/16A01P1/00
Inventor 李琦尚建库刘玲梅杨炜沂高世安
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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