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Preparation method of TiO2 material with oxygen vacancies

An oxygen vacancy and raw material technology, applied in the field of materials, can solve the problems of harsh reduction reaction conditions of metal element, flammable and explosive, unstable oxygen vacancy, etc., and achieve the effects of simple method, good stability and safe reaction.

Pending Publication Date: 2020-03-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods still have some problems, such as H 2 Flammable and explosive, the reaction conditions for the reduction of simple metals are too harsh, and the oxygen vacancies obtained by the liquid phase reduction of sodium borohydride are unstable, etc.

Method used

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  • Preparation method of TiO2 material with oxygen vacancies
  • Preparation method of TiO2 material with oxygen vacancies
  • Preparation method of TiO2 material with oxygen vacancies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Based on TiO 2 (B) TiO with oxygen vacancies synthesized from cellulose 2

[0033] Add 0.5 g of cellulose (artificial synthetic cellulose, particle size 65 μm, purchased from McLean Reagent Company) and 50 mL of deionized water into a 100 ml beaker, stir to dissolve and then add TiO 2 (B) 0.4g, stir until a homogeneous mixture. Heat and stir until the deionized water in the beaker is completely volatilized to obtain a solid mixture. The solid obtained by this method can closely and uniformly combine the titanium oxide and cellulose after later calcination. The solid mixture was heated to 650 °C in a nitrogen furnace and calcined for 1 h to obtain TiO after in situ reduction of cellulose. 2 Material.

[0034] The TiO obtained in Example 1 after in situ reduction of cellulose 2 material, its EPR characterization results are as follows figure 1 As shown, its XPS characterization results are as follows figure 2 shown. from figure 1 with figure 2 It ca...

Embodiment 2

[0036] Example 2 Based on TiO 2 (B) TiO with oxygen vacancies synthesized from D-glucose 2

[0037] Add 0.5 g D-glucose (purchased from Sigma Reagent Company) and 50 mL of deionized water into a 100 ml beaker, stir to dissolve and then add TiO 2 (B) 0.4 g, stir until the mixture is homogeneous. Heat and stir until the deionized water in the beaker is completely volatilized to obtain a solid mixture. The solid obtained by this method can closely and uniformly combine titanium oxide and D-glucose after later calcination. The solid mixture was heated to 650°C in a nitrogen furnace and calcined for 1 h to obtain TiO after in situ reduction of D-glucose. 2 Material. TiO after in situ reduction of D-glucose 2 materials, the formed TiO with oxygen vacancies 2 Accounted for 34%.

Embodiment 3

[0038] Embodiment 3 is based on TiO 2 (B) TiO with oxygen vacancies synthesized from sucrose 2

[0039] Add 0.5 g of sucrose (purchased from Sigma Reagent Company) and 50 mL of deionized water into a 100 ml beaker, stir to dissolve and then add TiO 2 (B) 0.4 g, stir until the mixture is homogeneous. Heat and stir until the deionized water in the beaker is completely volatilized to obtain a solid mixture. The solid obtained by this method can closely and uniformly combine the titanium oxide and sucrose after later calcination. The solid mixture was heated to 650 °C in a nitrogen furnace and calcined for 1 h to obtain TiO after in situ reduction of sucrose. 2 Material. TiO after in situ reduction with sucrose 2 materials, the formed TiO with oxygen vacancies 2 Accounted for 25%.

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Abstract

The invention discloses a preparation method of a TiO2 material with oxygen vacancies. The TiO2 material with the oxygen vacancies is prepared from a titanium dioxide raw material through in-situ reduction by biomass; and in the TiO2 material obtained after in-situ reduction of the titanium dioxide raw material by the biomass, the number of the formed oxygen vacancies accounts for 3%-60%. According to the invention, a biomass in-situ reduction method is mainly adopted; N atoms or C atoms in the biomass react with O in titanium dioxide at a high temperature and are thus converted into nitric oxide or carbon oxide; the nitric oxide or carbon oxide formed through conversion floats out along with inert gas; and therefore, oxygen atoms in the titanium dioxide are dragged out, and the TiO2 material with the oxygen vacancies is formed. The preparation method of the TiO2 material with the oxygen vacancies has the advantages of simple process, safe reaction, good stability of generated oxygen vacancies and the like.

Description

technical field [0001] The invention relates to the field of materials, in particular to a TiO with oxygen vacancies 2 The method of preparation of the material. Background technique [0002] TiO 2 As a promising semiconductor, it has received extensive attention in the past few decades due to its great application potential in the fields of optoelectronics, biomedicine, and photocatalysis, and the defects that affect TiO 2 important factor in performance, the TiO 2 Among the defects found in , oxygen vacancies are one of the most important defects. Nowadays, oxygen vacancies in metal oxides have been extensively studied both by theoretical calculations and experiments. The results show that oxygen vacancies can serve as important adsorption and active sites for heterogeneous catalysis, and have a strong impact on the reactivity of metal oxides. In addition, studies have shown that the photocatalytic properties of TiO metal oxides, including electronic structure, charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/04
CPCC01G23/043C01G23/08
Inventor 王建国周强魏中哲
Owner ZHEJIANG UNIV OF TECH
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