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Nitrogen and sulfur two-component doped nano titanium dioxide with long-wave absorbing function and its preparing method

A nano-doped titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of absorption limited to ultraviolet light and low absorption threshold

Inactive Publication Date: 2008-01-23
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the current application defect of low absorption threshold of nano-titanium dioxide in the field of photochemistry, the present invention expands the absorption threshold of nano-titanium dioxide by co-doping non-metallic elements nitrogen and sulfur into the lattice of nano-titanium dioxide, thereby solving the problem of nano-titanium dioxide on the sun. The light absorption is only limited to the ultraviolet region, and the nitrogen and sulfur two-component doped nano-titanium dioxide is prepared; the present invention will disclose its preparation method at the same time

Method used

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  • Nitrogen and sulfur two-component doped nano titanium dioxide with long-wave absorbing function and its preparing method

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Embodiment 1

[0021] Embodiment 1, 5.6g urea and 7.2g thiourea are dissolved in the mixed solution of 25ml ethanol and 10ml hydrochloric acid, the ethanol solution (volume ratio is 1: 5), after the dropwise addition, continue to stir for 5 hours, then evaporate the prepared sample to dryness at a temperature of 100°C, take out the solid, grind it, and roast it in the air at a temperature of 450°C, the final solid is non-metallic Elemental nitrogen and sulfur co-doped nano titanium dioxide. Wherein the content of nitrogen is 0.65%, and the content of sulfur is 1.12%. Referring to Figure 1-1, Figure 1-2 and Figure 2: In the XPS spectrum of the obtained nano-titanium dioxide, the characteristic peak of the 2p electron binding energy of sulfur in the Ti-S bond is 160eV; the 1S electron of nitrogen in the Ti-N bond The characteristic peak of the binding energy is 396eV; the ultraviolet / visible absorption spectrum shows that the absorption edge range of the nano-titanium dioxide reaches 550nm-65...

Embodiment 2

[0022] Embodiment 2, 5.0g ammonium chloride and 7.2g thiourea are dissolved in the mixed solution of 25ml ethanol and 10ml hydrochloric acid, the ethanolic solution of butyl titanate is added dropwise in this solution under the condition of constant stirring (volume ratio is 1:5), after the dropwise addition, continue to stir for 5 hours, then evaporate the prepared sample to dryness at a temperature of 100°C, take out the solid, grind it, and roast it in air at a temperature of 450°C, the final solid is Non-metal element nitrogen and sulfur co-doped nano titanium dioxide. Wherein the content of nitrogen is 1.16%, and the content of sulfur is 0.83%.

Embodiment 3

[0023] Embodiment 3, 5.6g urea and 7.1g ammonium thiocyanate are dissolved in the mixed solution of 25ml ethanol and 10ml hydrochloric acid, the ethanolic solution of butyl titanate is added dropwise in this solution under the condition of constant stirring (volume ratio is 1:5), after the dropwise addition, continue to stir for 5 hours, then evaporate the prepared sample to dryness at a temperature of 100°C, take out the solid, grind it, and roast it in air at a temperature of 450°C, the final solid is Non-metal element nitrogen and sulfur co-doped nano titanium dioxide. Wherein the content of nitrogen is 1.62%, and the content of sulfur is 0.60%.

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Abstract

The invention is an N-S doped nano TiO2 with long wave absorbing function, characterized in that N content is 0.65%-1.62%, S content is 0.6%-1.12%, and TiO2 the rest, where in its XPS pattern, characteristic peak of bond energy of 2p electrons of S in Ti-S bond is 160eV and that of 1S electron of N in Ti-N bond is 396eV; UV / visible absorption pattern shows that its absorption side range is 550nm-650nm, and its preparing method: adding N- and S- containing compound into alcohol-hydrochloric acid mixed solution in the molar ratio of 1 to 1; dropping in alchol solution of butyl titanate; after hydrolyzation completely ends, evaporate to dryness at 80-150 deg.C to make it. And the N-containing compound is selected from urea, ammonium chloride, and ammonium nitrate; and the S-containing compound is selected from thiourea and ammonium thiocyanate.

Description

technical field [0001] The invention relates to a nano-titanium dioxide and a preparation method thereof, in particular to a two-component doped nano-titanium dioxide with long-wave absorption function of non-metal element nitrogen and sulfur, and a preparation method thereof. Background technique [0002] Due to its good chemical stability, wear resistance, low cost and direct use of sunlight, titanium dioxide has broad application prospects in photoelectric conversion, chemical synthesis and photocatalytic conversion to treat environmental pollutants. However, the absorption of titanium dioxide is limited to the ultraviolet region, and the content of ultraviolet light in sunlight is only 3% to 4%, so its solar energy utilization rate is low. If the absorption threshold of titanium dioxide photocatalyst can be extended to the visible light region, full use As the energy source of photocatalytic technology, solar energy is of great significance both for the protection of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047B01J21/06B01J27/24B01J27/02
Inventor 冯玉英肖文敏周家宏宋开玺
Owner NANJING NORMAL UNIVERSITY