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Mesoporous silica/carbon dot nanometer composite and preparation method thereof

A technology of mesoporous silica and nanocomposite materials, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of limited application range, toxicity, quenching, etc., and achieve the effect of simple preparation process and mild reaction conditions

Inactive Publication Date: 2015-09-02
ZHOUKOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there have been many reports on fluorescent mesoporous silica composite materials, such as grafting traditional organic fluorescent materials or inorganic quantum materials such as CdSe on the surface or channels of mesoporous silica, but organic fluorescent materials have fluorescence attenuation and The shortcoming of quenching, and inorganic metal quantum dots have certain toxicity, which greatly limits its application range, which is not conducive to the application in the biological field

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  • Mesoporous silica/carbon dot nanometer composite and preparation method thereof
  • Mesoporous silica/carbon dot nanometer composite and preparation method thereof
  • Mesoporous silica/carbon dot nanometer composite and preparation method thereof

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Embodiment 1

[0026] Mesoporous silica / carbon quantum dot nanocomposite material and preparation method thereof, comprising the following steps:

[0027] Step 1, the preparation of mesoporous silica SBA-15, first add 2-3 g triblock copolymer P123 to 100 ml 2.0 mol / L dilute hydrochloric acid, stir in a constant temperature water bath at 30-42 ℃ for 2- After 8 hours, add 4-6 g tetraethyl orthosilicate dropwise during vigorous stirring, and continue stirring at a constant temperature of 30-42°C for 12-24 hours after the dropping, then transfer the mixed solution to an oven at 75-85°C for aging for 12 hours. -24 h, after cooling to room temperature, filter with suction, wash with deionized water until there is no foam, dry at room temperature, and finally heat up to 530-550°C in an air atmosphere and then roast for 5-6 h to obtain a white powdery substance;

[0028] Step 2, preparation of mesoporous silica / carbon quantum dot precursor, adding 0.1-0.2 g of the white powdery substance prepared in...

Embodiment 2

[0036]Step 1, preparation of mesoporous silica SBA-15, preparation of mesoporous silica with nonionic surfactant-triblock copolymer EO 20 PO 70 EO 20 It is a template agent, which is prepared by a typical sol-gel method. The specific preparation process is: take 2-3 g triblock copolymer (P123, Ma≈5800) in a conical flask, add 2.0 mol / L dilute hydrochloric acid 100 mL and 15 mL of deionized water, stirred in a constant temperature water bath at 40°C for 6 h. Add 4-6 g of tetraethyl orthosilicate dropwise under vigorous stirring, and continue stirring at a constant temperature of 40°C for 24 h after the dropping, and then transfer the solution to an oven for aging at 80°C for 24 h. After cooling to room temperature, filter with suction, wash with deionized water until there is no foam, dry at room temperature, and finally heat up to 550 °C for 6 h in an air atmosphere to obtain white powder SBA-15 at a heating rate of 1 o C / min.

[0037] Step 2, preparation of mesoporous si...

Embodiment 3

[0041] Step 1, preparation of mesoporous silica SBA-15, preparation of mesoporous silica with nonionic surfactant-triblock copolymer EO 20 PO 70 EO 20 It is a template agent, which is prepared by a typical sol-gel method. The specific preparation process is: take 2.5 g triblock copolymer (P123, Ma≈5800) in a conical flask, add 100 mL of 2.0 mol / L dilute hydrochloric acid and 20 mL of deionized water, stirred in a constant temperature water bath at 35°C for 8 h. Under vigorous stirring, 5 g of tetraethyl orthosilicate was added dropwise, and after the drop was completed, stirring was continued at a constant temperature of 40 °C for 24 h, and then the solution was transferred to an oven for aging at 75 °C for 20 h. After cooling to room temperature, filter with suction, wash with deionized water until there is no foam, dry at room temperature, and finally heat up to 530 °C in air atmosphere and roast for 6 h to obtain white powder SBA-15 at a heating rate of 2 o C / min.

[0...

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Abstract

The invention discloses a mesoporous silica / carbon dot nanometer composite and a preparation method thereof. The preparation method of the mesoporous silica / carbon dot nanometer composite includes steps of synthesizing hexagonal ordered mesoporous silica SBA-15 (nearly 8 nm in bore diameter) by triblock copolymer P123; steeping the mesoporous SBA-15 silica in a certain concentration of citric acid solution for adsorption, and filling citric acid molecules into holes of mesoporous SBA-15; roasting the SBA-15 filled with citric acid in a chamber resistance furnace to obtain mesoporous silica / carbon dot nanometer composite. The carbon dots are uniformly loaded in the holes of the mesoporous SBA-15, and the multifunctional nanometer composite with ordered mesoporous structure and fluorescent function is prepared. The mesoporous silica / carbon dot nanometer composite has the advantages of simplicity in preparation technique, moderate reaction conditions and environment friendliness.

Description

technical field [0001] The invention relates to a mesoporous silica / carbon quantum dot nanocomposite material, and also relates to a preparation method of the mesoporous silica / carbon quantum dot nanocomposite material. Background technique [0002] Mesoporous silica has large pore size (greater than 2 nm), huge specific surface area and pore volume, highly ordered pore arrangement, and tunable pore size in a wide range. In addition, its surface is rich in silanol, which is easy for surface modification and modification. Among them, SBA-15 mesoporous silica has highly ordered hexagonal cylindrical channels with a pore diameter of about 8 nm, which is conducive to the assembly of guest molecules in its channels and microreactors that act as guest molecule reactions. Compared with traditional mesoporous silica MCM-41, SBA-15 has significantly improved thermal stability and mechanical properties. In recent years, the study of loading drug molecules into the pores of mesoporou...

Claims

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Application Information

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IPC IPC(8): C09K11/65
Inventor 田博士刘少华王振领李春阳胡彬王梦楠
Owner ZHOUKOU NORMAL UNIV
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