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Method for preparing mesoporous SiO2/CdS composite nanosphere

A nanosphere and mesoporous technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of semiconductor CdS photocatalysts, such as the presence and small specific surface area, and achieve convenient scale, Simple equipment and mild reaction conditions

Inactive Publication Date: 2014-02-19
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the existing preparation of SiO 2 The method of / CdS composite nanomaterials, on the one hand, either has a small specific surface area; on the other hand, the semiconductor CdS photocatalyst prepared is in the pores of mesoporous silicon.

Method used

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  • Method for preparing mesoporous SiO2/CdS composite nanosphere
  • Method for preparing mesoporous SiO2/CdS composite nanosphere
  • Method for preparing mesoporous SiO2/CdS composite nanosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A preparation of mesoporous SiO 2 The method for / CdS composite nanosphere, its step is:

[0061] (1) Add 44.5g tetraethyl orthosilicate, 16.8g octadecyltrimethoxysilane, 30g ammonia water (mass concentration 25%-28%) into 100 ml ethanol, stir to obtain a milky mixture, and mix the The obtained milky solution was sealed, the temperature was controlled at 90°C, and the reaction was carried out for 12 hours. The product was obtained by centrifugation, and the product was washed three times with absolute ethanol to obtain SiO 2 nanospheres;

[0062] (2) Take the above SiO 2 12g nanospheres, dispersed in 100 ml ethanol solution, add 50g hydrazine hydrate (mass concentration 85%), 2.7g cadmium nitrate, 1.5g thiourea; react the solution at 90°C for 24 hours, and obtain SiO after centrifugation 2 / CdS composite nanosphere;

[0063] (3) The resulting SiO 2 / CdS composite nanospheres were calcined at 900°C for 4 hours to obtain mesoporous SiO 2 / CdO composite nanospheres; ...

Embodiment 2

[0071] A preparation of mesoporous SiO 2 The method for / CdS composite nanosphere, its step is:

[0072] (1) Add 20 g of propyl orthosilicate, 8.0 g of octadecyltrimethoxysilane, and 20 g of ammonia water (25%-28% in mass concentration) into 100 ml of propanol, and stir to obtain a milky mixture. The resulting milky solution was sealed, the temperature was controlled at 30 ° C, and the reaction was carried out for 6 hours. The product was obtained by centrifugation, and the product was washed three times with absolute ethanol to obtain SiO 2 nanospheres;

[0073] (2) Take the above SiO 212g nanospheres, dispersed in 100ml ethylene glycol solution, add 40g hydrazine hydrate (mass concentration 85%), 1.7g cadmium chloride, 1.0g thiourea; react the solution at 50°C for 12 hours, and centrifuge SiO 2 / CdS composite nanosphere;

[0074] (3) The resulting SiO 2 / CdS composite nanospheres were calcined at 700 °C for 2 hours to obtain mesoporous SiO 2 / CdO composite nanospheres;...

Embodiment 3

[0082] A preparation of mesoporous SiO 2 The method for / CdS composite nanosphere, its step is:

[0083] (1) Add 10g of butyl orthosilicate, 5g of octadecyltrimethoxysilane, and 40g of ammonia water (25%-28% in mass concentration) into 100ml of ethylene glycol, and stir to obtain a milky mixture. The resulting milky solution was sealed, the temperature was controlled at 50 ° C, and the reaction was carried out for 12 hours. The product was obtained by centrifugation, and the product was washed three times with absolute ethanol to obtain SiO 2 nanospheres;

[0084] (2) Take the above SiO 2 10g nanospheres, dispersed in 100 ml ethanol solution, add 10g hydrazine hydrate (mass concentration 85%), 2.7g cadmium sulfate, 1.4g thiourea; react the solution at 60°C for 8 hours, and obtain SiO after centrifugation 2 / CdS composite nanosphere;

[0085] (3) The resulting SiO 2 / CdS composite nanospheres were calcined at 600 °C for 4 hours to obtain mesoporous SiO 2 / CdO composite nan...

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Abstract

The invention relates to a method for preparing a mesoporous SiO2 / CdS composite nanosphere. The method is characterized by comprising the following steps of: hydrolyzing orthosilicate ester and C18TMS under the catalysis of ammonia water to prepare an SiO2 nanosphere, and performing reaction for 4 to 24 hours under the condition of 0 to 90 DEG C by taking the SiO2 nanosphere as a template, taking a cadmium salt as a cadmium source and taking thiourea as a sulfur source to obtain an SiO2 / CdS composite nanosphere; and calcining the SiO2 / CdS composite nanosphere at high temperature to obtain the mesoporous SiO2 / CdS composite nanosphere, and performing reaction for 2 to 8 hours at 30 to 200 DEG C by using H2S to obtain the mesoporous SiO2 / CdS composite nanosphere with a diameter of 270 to 400nm. In the process of preparing the mesoporous SiO2 / CdS composite nanosphere, reaction conditions are mild, simple equipment is required, large-scale preparation is facilitated, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing compound semiconductor functional nanomaterials. Background technique [0002] Since composite nanomaterials are an important class of nanostructured materials, they have many important applications in the fields of drug release, photocatalysts, and laser diodes, especially SiO, which has both adsorption and photocatalysis properties. 2 / CdS composite nanomaterials have high application value in many fields such as photocatalysis, dye adsorption, and fluorescent probes. On the one hand, CdS is a visible-light-excited photocatalyst with a narrow band gap (2.42 eV), which can be used for the visible-light degradation of N-containing organic dyes such as rhodamine B. On the other hand, due to the mesoporous SiO 2 With a large specific surface area, it can be used for the adsorption of pollutants such as organic dyes. Currently, the SiO 2 T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/02C01B33/18B82Y40/00B82Y30/00
Inventor 钱海生胡金林应桃开章红宝郑佑楣阿尔孜古丽·玉苏甫
Owner ZHEJIANG NORMAL UNIVERSITY
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