Method for preparing metal oxide nanosheet with quantum size by taking biomass as template

A biomass and oxide technology, applied in the field of materials, can solve the problems of difficult separation, increased use cost, low catalyst utilization efficiency, etc., and achieves the effect of simple preparation

Active Publication Date: 2019-06-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quantum size catalyst has good dispersion in water, and it is difficult to separate from the system after the catalytic reaction, resulting in low utilization efficiency of the catalyst and indirectly increasing the cost of use

Method used

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  • Method for preparing metal oxide nanosheet with quantum size by taking biomass as template
  • Method for preparing metal oxide nanosheet with quantum size by taking biomass as template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Grind the carbonized biomass template (50mg) with a hierarchical structure evenly, immerse it in 5ml titanyl sulfate solution (1M), soak for 7h, then suction filter and fully wash away the free titanyl sulfate, and freeze-dry the product ;

[0023] (2) The biomass material after step (1) was freeze-dried in N 2 Annealing at 650°C for 3 hours under atmosphere to prepare biomass-metal oxide composites;

[0024] (3) Annealing the composite material obtained in step (2) at 450° C. in an air atmosphere to remove the carbon layer to obtain a sheet structure composed of titanium dioxide nanoparticles.

[0025] The X-ray diffraction spectrogram confirms that the preparation method has successfully synthesized titanium dioxide (refer to attached figure 1 ). Transmission electron microscope photos show that this method successfully obtains a two-dimensional sheet structure composed of nanoparticles, and the particle size of the nanoparticles is 3-5 nanometers (see figure...

Embodiment 2

[0027] (1) Grind the carbonized biomass template (50 mg) with a hierarchical structure evenly, immerse it in 5 ml of nickel acetate (0.2 M), soak for 7 hours, then suction filter and fully wash away the free nickel acetate, and freeze-dry the product;

[0028] (2) The biomass material after step (1) was freeze-dried in N 2 Annealing at 650°C for 3 hours under atmosphere to prepare biomass-metal oxide composites;

[0029] (3) Anneal the composite material obtained in step (2) at 500° C. for 1 h in an air atmosphere, remove the carbon layer, and obtain a sheet structure composed of nickel oxide nanoparticles.

Embodiment 3

[0031] (1) Grind the carbonized biomass template (50 mg) with a hierarchical structure evenly, immerse it in 5 ml of cobalt acetate (0.2 M), soak for 7 hours, then suction filter and fully wash away the free cobalt acetate, and freeze-dry the product;

[0032] (2) The biomass material after step (1) was freeze-dried in N 2 Annealing at 500°C for 3 hours under atmosphere to prepare biomass-metal oxide composites;

[0033] (3) Anneal the composite material obtained in step (2) at 500° C. for 1 h in an air atmosphere, remove the carbon layer, and obtain a sheet structure composed of cobalt trioxide nanoparticles.

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Abstract

The invention discloses a method for preparing a metal oxide nanosheet with a quantum size by taking biomass as a template. The method comprises the following steps that carbonized biomass obtained through high-temperature calcination is used as a template, oxygen-containing functional groups exposed out of the surface of a hierarchical structure of the carbonized biomass are used as bridging points, and a metal oxide precursor is anchored to the hierarchical structure through the coupling effect; then high-temperature annealing is carried out in an N2 atmosphere for forming metal oxide nanoparticles, and calcination is carried out to remove a carbon frame structure, so that a lamellar structure composed of the quantum-size metal oxide nanoparticles is formed. Raw materials related in theinvention are low in price, the preparation process is simple and controllable, no organic solvent is contained, no harmful gas is generated, and environmental friendliness is achieved. The nanosheetprepared by the method has the characteristics of large size, adjustable particle size, porosity and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a method for preparing metal oxide nanosheets with quantum dimensions by using biomass as a template. The specific steps are to use the carbonized biomass obtained by high-temperature calcination as a template, and use the oxygen-containing functional groups exposed on the surface of its hierarchical structure as bridging points to anchor the metal oxide precursor on the hierarchical structure through coupling. and then in N 2 High-temperature annealing in the atmosphere forms metal oxide nanoparticles, and after the framework structure is removed by calcination, a two-dimensional sheet structure composed of quantum-sized, adjustable-sized and porous metal oxide particles is formed. The structural material can be applied in the fields of photocatalysis and electrocatalysis. Background technique [0002] In the field of photo / electrocatalysis, noble metals generally have excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C01G23/08B01J21/06B01J37/08B01J37/02B82Y40/00
Inventor 卢红斌刘沛莹曹梦婷张佳佳马建华王灿灿陈宇菲
Owner FUDAN UNIV
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