A kind of core-shell structure nanocomposite material based on biological method and its preparation method

A nanocomposite material and composite material technology, which can be used in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, chemical/physical processes, etc., and can solve the problems of poor dispersion, interfaciality and stability, etc. Achieve the effect of narrow particle size distribution, high stability and improved mass transfer

Active Publication Date: 2022-04-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts have high thermal stability and catalytic reactivity, the particle size distribution, dispersion, interface and stability of metal oxides used as supports are poorly regulated, and chemical reagents or reducing gases are used as reducing agents to prepare There is still room for further improvement in the degree of reduction, dispersion and stability of noble metal nanoparticles.

Method used

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  • A kind of core-shell structure nanocomposite material based on biological method and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] At room temperature, weigh 0.6g glycine and ultrasonically disperse in 30mL ethanol for 15min, then add 0.03mol ethylenediaminetetraacetic acid, stir for 1h, then add 1.0mL titanium n-butoxide, and continue stirring for 1h, finally transfer to 50mL polytetrafluoroethylene In an ethylene-lined hydrothermal reactor, hydrothermally react at 200°C for 20h, wash with ethanol, and dry at 60°C for 12h to obtain mesoporous TiO 2 hollow nanospheres;

[0031] Weigh 2g of Cinnamomum camphora leaf dry powder and ultrasonically disperse it in 100mL of deionized water for 15min, then heat at 90°C for 15min, cool and filter with suction to obtain the filtrate of plant matter extract with a concentration of 20g / L. Weigh 0.1 g of mesoporous TiO prepared in step a) 2 Hollow nanospheres were immersed in 5mL of chloroauric acid (concentration: 1mg / mL) for 1h, then 20mL of cinnamon camphor leaf extract was added, stirred for 2h, centrifuged with deionized water, dried at 60°C for 12h to ob...

Embodiment 2

[0036] At room temperature, weigh 0.8g alanine and ultrasonically disperse it in 40mL ethanol for 20min, then add 0.04mol sodium citrate, stir for 2h, then add 0.5mL titanium isopropoxide, and continue stirring for 0.5h, finally transfer to 50mL polytetrafluoroethylene In a vinyl fluoride-lined hydrothermal reaction kettle, hydrothermally react at 250°C for 18h, wash with ethanol, and dry at 50°C for 12h to obtain mesoporous TiO 2 hollow nanospheres;

[0037] Weigh 3g of Cinnamomum camphora leaf dry powder and ultrasonically disperse it in 100mL of deionized water for 20min, then heat at 80°C for 20min, cool and filter with suction to obtain the filtrate of plant matter extract with a concentration of 30g / L. Weigh 0.2g of mesoporous TiO prepared in step a) 2 The hollow nanospheres were immersed in 5 mL of gold acetate (concentration: 0.5 mg / mL) for 2 h, then 15 mL of cinnamomum camphora leaf extract was added, stirred for 3 h, washed with deionized water, and dried at 50 °C f...

Embodiment 3

[0042] At room temperature, weigh 0.7g leucine and ultrasonically disperse it in 30mL ethanol for 10min, then add 0.05mol sodium tartrate, stir for 3h, then add 1.5mL titanium n-butoxide, and continue stirring for 2h, finally transfer to 50mL polytetrafluoroethylene In the lined hydrothermal reaction kettle, hydrothermal reaction was carried out at 200 °C for 30 h, centrifuged and washed with ethanol, and dried at 80 °C for 10 h to obtain mesoporous TiO 2 hollow nanospheres;

[0043] Weigh 1g of dry powder of camphor leaves and ultrasonically disperse in 100mL of deionized water for 10min, then heat at 80°C for 10min, cool and filter with suction to obtain a filtrate of plant matter extract with a concentration of 10g / L. Weigh 0.1 g of mesoporous TiO prepared in step a) 2 The hollow nanospheres were immersed in 5 mL of gold acetate (concentration: 0.2 mg / mL) for 0.5 h, then 30 mL of camphor leaf extract was added, stirred for 2 h, washed with deionized water, and dried at 80°...

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Abstract

The invention discloses a biological method-based core-shell structure nano-composite material and a preparation method thereof. The nano-composite material is first derived from an amino acid modified by a complexing agent as a biological soft template to derivate an active oxide mesoporous TiO 2 Hollow nanospheres, and then use the extract of cinnamon camphor leaves as a bioreductant to obtain uniformly dispersed Au nanoparticles on the surface, and then in situ grow the inert oxide ZrO 2 The nanocomposite material with core-shell structure was finally obtained and applied to the liquid-phase selective oxidation of benzyl alcohol. The nanocomposite material prepared by the method has high thermal stability and excellent catalytic reaction performance, and shows good application prospects in the field of nanocatalysis.

Description

technical field [0001] The invention relates to a core-shell structure nano composite material based on a biological method and a preparation method thereof, which belongs to the preparation technology of nano composite materials. Background technique [0002] With the in-depth research and rapid development of nanomaterials and their preparation technology, metal oxides and noble metal nanoparticles with unique physical and chemical properties have received extensive attention. By adjusting the preparation technology of nanomaterials, the surface morphology and size of the materials can be adjusted, so as to endow the materials with new functions, help to improve their reaction performance, and expand their application fields. [0003] Patent CN105854878A provides a composite metal oxide-supported Pt-based nano-metal catalyst and its preparation method. The catalyst is first mixed with a metal salt solution, a chloroplatinic acid solution and a potassium borohydride solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J35/08
CPCB01J31/38B01J35/0066B01J35/08
Inventor 张一卫袁绅豪周钰明王彦云吕绪帅吴杨进毛春峰盛晓莉
Owner SOUTHEAST UNIV
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