Porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube and preparation method thereof

A technology of titanium dioxide and hollow nanometers, which is applied in the field of porous thin-walled titanium dioxide/strontium sulfate heterojunction hollow nanocubes and its preparation, and can solve problems such as low carrier transport rates

Pending Publication Date: 2019-04-23
CHONGQING TECH & BUSINESS UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its wide band gap, high photogenerated electron-hole recombination rate, and low carrier transport rate, people are forced to study the modification of titanium dioxide.

Method used

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  • Porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube and preparation method thereof
  • Porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube and preparation method thereof
  • Porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] A kind of preparation method of porous thin-walled titania / strontium sulfate heterojunction hollow nanocube is carried out according to the following steps:

[0045] a Preparation of cubic strontium titanate: mix strontium carbonate and titanium dioxide in a molar ratio of 1:1, add water with a mass ratio of 20% to mixture 2, and then add a sufficient amount of alkaline substance to keep it at In an alkaline reaction environment, the alkaline substance is a mixture of potassium hydroxide and sodium hydroxide at a mass ratio of 1:0.5; then react at a temperature of 160°C for 36 hours, then cool and wash away Alkaline substances until the pH is neutral, and finally dried to obtain cubic strontium titanate;

[0046] b Heating reaction: add 2.0 mol / L sulfuric acid and the cubic strontium titanate prepared in step b into a sealed tank at a mass ratio of 30 to 80:1, and react in a temperature environment of 250° C. for 8 hours;

[0047] c washing and drying: take out the rea...

Embodiment 2

[0049] A kind of preparation method of porous thin-walled titania / strontium sulfate heterojunction hollow nanocube is carried out according to the following steps:

[0050] a Preparation of cubic strontium titanate: mix strontium carbonate and titanium dioxide in a molar ratio of 1:1, and then add a sufficient amount of alkaline substance to keep it in an alkaline reaction environment. The alkaline substance is hydrogen Potassium oxide and sodium hydroxide are mixed in a mass ratio of 1:1.7; then reacted in a temperature environment of 250°C for 12 hours, then cooled and washed away alkaline substances until the pH is neutral, and finally dried to obtain cubic titanium strontium acid;

[0051] b Heating reaction: add 0.8 mol / L sulfuric acid and the cubic strontium titanate prepared in step b into a sealed tank at a mass ratio of 30 to 80:1, and react in a temperature environment of 160°C for 36 hours;

[0052] c washing and drying: take out the reaction product of step b and ...

Embodiment 3

[0054] A kind of preparation method of porous thin-walled titania / strontium sulfate heterojunction hollow nanocube is carried out according to the following steps:

[0055] a Preparation of cubic strontium titanate: mix strontium carbonate and titanium dioxide in a molar ratio of 1:1, add water with a mass ratio of 10% to mixture 2, and then add a sufficient amount of alkaline substance to keep it at In an alkaline reaction environment, the alkaline substance is a mixture of potassium hydroxide and sodium hydroxide in a mass ratio of 1:0.72; then react in a temperature environment of 200°C for 24 hours, then cool and wash away Alkaline substances until the pH is neutral, and finally dried to obtain cubic strontium titanate;

[0056] b Heating reaction: add 1.2mol / L sulfuric acid and the cubic strontium titanate prepared in step b into a sealed tank at a mass ratio of 30 to 80:1, and react in a temperature environment of 200°C for 24 hours;

[0057] c Washing and drying: Take ...

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Abstract

The invention discloses a porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube. According to the porous thin-wall titanium dioxide/strontium sulfate heterojunction hollownanocube, two nanoparticles of SrSO4 and TiO2 or pure TiO2 nanoparticles are laid into a heterojunction with a side length of 300-550 nm and a wall thickness of 40-55 nm and in a hollow nanocube structure, and the wall of the heterojunction is provided with mesopores with a pore size of 6-20 nm. The preparation method of the porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube comprises, a, preparing cubic strontium titanate, specifically, compounding strontium carbonate and titanium dioxide at a weight ratio of 1:1 with water and alkaline materials through a compound alkali and hydrothermal method to obtain the cubic strontium titanate; b, performing heating reaction on sulfuric acid and the cubic strontium titanate; c, performing washing and drying treatment to obtain the heterojunction in the hollow nanocube structure. According to the porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube and the preparation method thereof,the prepared porous thin-wall titanium dioxide/strontium sulfate heterojunction hollow nanocube is high in photoelectric performance and can effectively increase the photoelectric conversion efficiency, the photo-induced electron hole separating efficiency and the water photolysis hydrogen production performance.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemical nanometer materials, and in particular relates to a porous thin-walled titanium dioxide / strontium sulfate heterojunction hollow nanocube and a preparation method thereof. Background technique [0002] In recent years, research on photocatalytic degradation of pollutants, water splitting to produce hydrogen and reduction of carbon dioxide has attracted widespread attention in the international academic community. Photocatalytic water splitting is considered to be the most challenging problem. The key to realize this reaction is to develop high-efficiency photocatalysts, and then construct high-efficiency photocatalytic or photoelectric catalytic systems. In-depth research on photocatalysts and photocatalytic reaction processes has found that photocatalysis includes three continuous basic processes: excitation of photogenerated carriers, separation and transport of photogenerated elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02C01B3/04
CPCB01J23/02B01J35/004C01B3/042Y02E60/36
Inventor 张翠玲胡陈果王曌王雪
Owner CHONGQING TECH & BUSINESS UNIV
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