Small-size high-specific-surface-area nano heterostructure hollow sphere and preparation method thereof

A nano-heterostructure, high specific surface area technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problem that the number of active points is not high and the performance of nano-heterojunction cannot be applied , low performance of heterojunction composite materials, etc., to achieve the effect of eliminating surface states and electron traps, high crystallization quality, and avoiding agglomeration

Active Publication Date: 2014-09-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the specific surface area of ​​these nano-heterojunctions is generally not higher than 100m 2 g -1 , so that the number of active sites exposed on the surface for catalytic reactions is not high, which directly leads to poor performance of heterojunction composites
These comprehensive factors have led to the fact that the performance of the existing nano-heterojunction cannot be applied to actual production and life.

Method used

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  • Small-size high-specific-surface-area nano heterostructure hollow sphere and preparation method thereof
  • Small-size high-specific-surface-area nano heterostructure hollow sphere and preparation method thereof
  • Small-size high-specific-surface-area nano heterostructure hollow sphere and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] TiO 2 / SnO 2 Nano-heterostructure hollow spheres:

[0026] (1) 0.3g SnCl 2 and 0.31g of tetrabutyl titanate were dissolved in 100mL of ethanol to obtain a multimetal ion solution, and then 1g of carbon sphere templates with carboxyl and hydroxyl groups on the surface were added to the multimetal ion solution, ultrasonicated for 30min, and then adsorbed at room temperature. While stirring for 12 hours, a mixed solution was obtained;

[0027] (2) Suction filter the mixed solution with a filter membrane with a pore size of 450 nanometers to obtain adsorbed carbon spheres, place them at 40° C., and dry for 48 hours;

[0028] (3) Put the dried carbon spheres into a tube furnace for heat treatment in the air environment at 350°C for 6 hours, and control the temperature rise at 1°C per minute, and then obtain hollow nanostructures containing oxides of Sn and Ti components ;

[0029] (4) Using the Sn and Ti component oxide hollow nanostructures obtained in step (3) to prep...

Embodiment 2

[0037] Al 2 o 3 / ZnO nano-heterostructure hollow spheres:

[0038] (1) Add 0.1g Al(Ac) 3 and 1g Zn(Ac) 2 Dissolve in 100mL of water to obtain a polymetallic ion solution, then add 1g of carbon sphere templates with carboxyl and hydroxyl groups to the polymetallic ion solution, sonicate for 50min, and then adsorb at room temperature while stirring for 12 hours to obtain a mixed solution;

[0039] (2) Suction filter the mixed solution with a filter membrane with a pore size of 450 nanometers to obtain adsorbed carbon spheres, place them at 100° C., and dry for 2 hours;

[0040] (3) Put the dried carbon spheres into a tube furnace for heat treatment in an air environment at 350°C for 6 hours, and control the temperature rise at 1°C per minute, and then obtain a hollow nanostructure containing Al and Zn components ;

[0041] (4) Al and Zn component oxide hollow nanostructures obtained in step (3) are used to prepare Al by annealing 2 o 3 / ZnO nano-heterostructure hollow sp...

Embodiment 3

[0043] Cr 2 o 3 / TiO 2 Nano-heterostructure hollow spheres:

[0044] (1) 0.41g Cr(NO 3 ) 3 and 0.27g tetrabutyl titanate are dissolved in 100mL ethanol to obtain a multimetal ion solution, then add 0.4g SiO with carboxyl and hydroxyl groups on the surface of the multimetal ion solution 2 Spherical template, sonicated for 70 minutes, then adsorbed at room temperature while stirring for 12 hours to obtain a mixed solution;

[0045] (2) Suction filter the mixed solution with a filter membrane with a pore size of 450 nanometers to obtain the adsorbed SiO 2 Balls, placed at 60°C, dried for 10 hours;

[0046] (3) The dried SiO 2 Put the ball into a tube furnace for heat treatment in the air environment at 350°C for 6h, and control the temperature rise at 1°C per minute, then add it into a 5M NaOH solution, stir at room temperature for 3h to dissolve the SiO 2 The spherical template is dissolved to obtain a hollow nanostructure containing oxides of Cr and Ti components;

[0...

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Abstract

The invention discloses a small-size high-specific-surface-area nano heterostructure hollow sphere and a preparation method thereof. A spherical shell of the hollow sphere provided by the invention is composed of more than two metal oxides; crystal grains of different metal oxides form heterojunctions on the surface of the spherical shell; the thickness of the spherical shell is below 20 nanometers; the size of a single heterojunction is 2-20 nanometers; the diameter of the hollow sphere is 80-800 nanometers. According to the invention, a template adsorption method is utilized, and the nano heterostructure hollow sphere is prepared from multi-metal-ion solutions and subsequent annealing treatment. The specific surface area of the hollow sphere provided by the invention is generally greater than 200m<2>.g<1->, and the size of the heterojunction is around 10 nanometers; the interface crystal quality of the heterojunction is high, and the defects of surface state, electron trap and the like which are generated at an interface are eliminated; the method provided by the invention is simple, is relatively low in cost, has a great range of the selection of types of semiconductor materials and the amount of semiconductors, and is beneficial to the industrialization application.

Description

technical field [0001] The invention relates to a nano-heterostructure hollow sphere and a preparation method thereof, in particular to a nano-heterostructure hollow sphere with a small size and high specific surface area and a preparation method thereof. Background technique [0002] With the development of world civilization, human needs to consume more and more energy, and correspondingly, more and more environmental pollutants are discharged. Since the earth's resources are limited, energy and environmental issues have become a huge challenge that contemporary development must face. In recent years, in the face of the increasingly unbalanced supply and demand of traditional energy and the severe situation of global warming, countries all over the world have increased their efforts in the development and utilization of new energy technologies and environmental protection technologies. Solar energy has great potential, low environmental pollution, sustainable utilization,...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B01J20/06B01J20/08B01J20/28B01J20/30B01J23/14B01J35/08
Inventor朱丽萍李亚光
OwnerZHEJIANG UNIV