Method for rapidly detecting oxygen vacancy in titanium oxide

A technology of titanium oxide and oxygen vacancies, which is applied in the direction of chemiluminescence/bioluminescence, and analysis by making materials undergo chemical reactions, can solve the problems of high cost, long time consumption, and high requirements, and achieve short reaction time, simple equipment, and methods easy effect

Inactive Publication Date: 2015-09-09
BEIJING UNIV OF CHEM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

For example: A.N.Petrov, Solid State Ionics 1995,80,189-199 This document uses the surface titration method, which is a traditional qualitative and quantitative analysis method for oxygen vacancies, and its disadvantage is that when TiO 2 When the color of the catalyst is darker, the titration end point is easily disturbed, resulting in certain errors
Literature Xu, X.Inorg.Chem.2015, 54, 1556-1562 used electron paramagnetic spectroscopy (ESR) to effectively characterize oxygen vacancies, but usually this method has relatively high system requirements and requires professional technology Personnel operation; literature Murray, C.B.J.Am.Chem.Soc.2012,134,6751-6761 uses X-ray photoelectron spectroscopy (XPS), and uses the XPS binding energy of O 1s to characterize TiO 2 Oxygen vacancies on the surface, but this method is relatively expensive and time-consuming, which limits the wide applicability of this technology

Method used

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  • Method for rapidly detecting oxygen vacancy in titanium oxide
  • Method for rapidly detecting oxygen vacancy in titanium oxide
  • Method for rapidly detecting oxygen vacancy in titanium oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] use figure 1 The experimental setup.

[0022] A. Take undoped TiO 2 and 1.0%, 1.5%, 2.0% Cu-doped TiO 2 Add the powder into deionized water and stir evenly to make a 0.50g / mL slurry; apply it on the ceramic rod with a thickness of about 0.50mm, insert the ceramic rod into the quartz tube, apply a voltage of 105V to the ceramic rod, and then Use the air treated with silica gel and activated carbon in the air pump as the carrier gas for the reaction to ventilate for 30 minutes, and the gas flow rate is 250mL / min. When the temperature of the ceramic rod reaches 170°C, start the heating device of the vaporization chamber until the temperature of the vaporization chamber is 170°C. ℃. Ensure the stable operation of the chemiluminescence analyzer.

[0023] B. Inject 25 μL of 0.1mol / L ether solution into the vaporization chamber, and the air from the air pump is loaded into the quartz tube and Cu / TiO on the ceramic rod 2 The surface reacts with the oxygen chemisorbed on th...

Embodiment 2

[0034] TiO doped with Cu, Co, Fe, Cr four metal ions with a mass fraction of 1.0% 2 . Other steps are with embodiment 1, test result sees image 3 , the strength of the chemiluminescent signal is: Cu / TiO 2 >Co / TiO 2 >Fe / TiO 2 >Cr / TiO 2 .

Embodiment 3

[0036] With the undoped TiO in embodiment 1 2 The powders were calcined at 250°C, 300°C, 350°C, and 400°C for 2 hours under a hydrogen atmosphere, and the obtained samples were designated as H-250, H-300, H-350, and H-400. Other steps are with embodiment 1, test result sees Figure 4 , the strength of the chemiluminescent signal is: H-400>H-350>H-300>H-250.

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Abstract

The invention discloses a method for rapidly detecting an oxygen vacancy in titanium oxide. The method includes that gas molecule ether and oxygen are diffused to the titanium oxide surface; since the oxygen vacancy on the titanium oxide surface has strong capacity of adsorbing an oxygen molecule, the oxygen adsorbed to the oxygen vacancy forms a super-oxygen kind (O2<->) quite strong in oxidability by capturing a free electron, then, an ether molecule in the chemical adsorption state reacts with the O2<-> to form an acetaldehyde molecule (CH3CHO*) in the excited state, a certain energy can be produced in a process that the acetaldehyde molecule in the excited state returns to the ground state, and is released in a photology form, and a chemiluminescent analyzer detects a luminescence signal value of luminescence so as to obtain a value of the oxygen vacancy in the titanium oxide according to the direct proportion relation between the content of the oxygen vacancy and the luminescence signal. The method has the advantages of simple equipment, rapidity, easiness in operation and wide application prospect for assessment of the oxygen vacancy of extensive research significance in defective oxides.

Description

technical field [0001] The invention belongs to the research field of titanium oxide catalysts, and in particular relates to a method for rapidly detecting oxygen vacancies in titanium oxide by utilizing the correlation between oxygen vacancies of titanium oxide and ether-catalyzed luminescent reactions, and using ether as a molecular probe. Background technique [0002] Titanium oxide has excellent optical properties, high chemical stability, thermal stability, non-toxicity and large storage capacity in nature, and has shown good development prospects in many fields. The study found that the properties of titanium oxide are not only dependent on its geometry and electronic structure, but also affected by its defect structure. At present, many scientific workers have devoted themselves to the research on the chemical, electrical and optical properties of titanium oxide defects in order to better control the concentration of oxygen vacancies to promote catalytic reactions. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
Inventor 吕超王思张丽娟
Owner BEIJING UNIV OF CHEM TECH
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