Low-temperature preparation method of titanium dioxide photocatalyst co-doped with carbon, nitrogen and sulphur

A technology of carbon, nitrogen, sulfur and titanium dioxide, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., to achieve enhanced response, improved utilization, and mild reaction temperature Effect

Inactive Publication Date: 2008-12-31
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patented technology describes how certain types of materials like TiO2 or other metal oxides have been used to make better catalysts that remove harmful gases from indoor environments such as buildings' walls during construction work hours by generating radical species on their surface called oxygen atoms (OH). These techniques help create more effective chemical reactions at lower temperatures while also improving absorption efficiency when exposed to solar radiation. Additionally, these technologies allow for efficient use of natural resources without causing environmental damage through emissions into the environment caused by volatile organics released over long periods of times after they were manufactured.

Problems solved by technology

Technological Problem: Current techniques for modifying titanooxysulfate nanosheets involve adding different types of atoms called donbons to increase their ability to absorb UV rays while maintaining chemical reactivity. These modifications result from changes made during manufacturing processes like decomposition reactions, impurity incorporations, crystal growth issues, and instability caused by temperature fluctuations. Additionally, current methods require expensive equipment and complicated procedures involving multiple steps, leading to potential contaminating effects.

Method used

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  • Low-temperature preparation method of titanium dioxide photocatalyst co-doped with carbon, nitrogen and sulphur
  • Low-temperature preparation method of titanium dioxide photocatalyst co-doped with carbon, nitrogen and sulphur
  • Low-temperature preparation method of titanium dioxide photocatalyst co-doped with carbon, nitrogen and sulphur

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Effect test

Embodiment 1

[0024] Drop titanium tetrachloride into 15mL deionized water at 2°C to form a titanium-containing aqueous solution with a concentration of 0.25 mol / liter, then add L-cysteine ​​to make the molar ratio of cysteine ​​to titanium tetrachloride The ratio is 0.25:1; the obtained solution is placed in a 20mL reactor, and subjected to hydrothermal reaction at 180°C for 24 hours, and the obtained hydrothermal reaction product is washed with water and ethanol, separated, and dried at 50°C to obtain a light gray powder.

Embodiment 2

[0026] Drop titanium tetrachloride into 15mL deionized water at 2°C to form a titanium-containing aqueous solution with a concentration of 1.5 mol / liter, then add L-cysteine ​​to make the molar ratio of cysteine ​​to titanium tetrachloride The ratio is 2:1; the obtained solution is placed in a 20mL reactor, and subjected to hydrothermal reaction at 180°C for 24 hours, and the obtained hydrothermal reaction product is washed with water and ethanol, separated, and dried at 50°C to obtain a light gray powder. The XRD diffraction pattern of the powder product is shown in figure 1 in b.

Embodiment 3

[0028] Titanyl sulfate was dropped into 15mL deionized water at 3°C ​​to form a titanium-containing aqueous solution with a concentration of 5 mol / liter, and then L-cysteine ​​was added so that the molar ratio of cysteine ​​to titanium tetrachloride was 3:1; the obtained solution was placed in a 20mL reactor, and hydrothermally reacted at 180°C for 24 hours, and the obtained hydrothermally reacted product was washed with water and ethanol, separated, and dried at 50°C to obtain a light gray powder. The XRD diffraction pattern of the powder product is shown in figure 1 In c; the XPS full spectrum of the product is shown in figure 2 , the mass percent of each element in the product is C: 34.3%; O: 47.5%; Ti: 14.5%; N: 2.1%; S: 1.6%. The SEM image of the product is shown in image 3 .

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Abstract

The invention discloses a low-temperature preparation method of a photocatalyst codoping titanium dioxide, carbon, nitrogen and sulfur. The method is characterized in that an inorganic titanium compound is taken as a precursor and the biomolecular amino acid is taken as a dopant so as to carry out hydrothermal reaction at a lower temperature, and the product thus obtained is the titanium dioxide codoping carbon, nitrogen and sulfur; compared with the undoped titanium dioxide, the band-gap energy of the titanium dioxide becomes narrower owing to the synergetic action among the carbon, the nitrogen and the sulfur, therefore, the response to visible light is enhanced and the activity under visible light is obviously improved, particularly, the photocatalyst has high activity in gas phase degradation; and the photocatalyst has the advantages of simple preparation process, mild conditions and good repeatability, and can be applied to the fields of environmental science and engineering.

Description

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Claims

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Application Information

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Owner HUAZHONG NORMAL UNIV
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