Synthesis and surface decorating method of rare-earth nanometer compound material

A nanocomposite material and surface modification technology, which is applied in the synthesis and surface modification of rare earth nanocomposite materials, can solve the problems of limited photocatalytic performance improvement, limited application of titanium dioxide, weak oxidation ability, etc., and achieves good modification effect and easy composition Controlled, low-cost effects

Inactive Publication Date: 2009-09-02
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Titanium dioxide is a commonly used photocatalyst in the field of photocatalysis, but since the bandgap width of titanium dioxide is 3.2eV, its corresponding absorption wavelength is 387.5nm, that is, only when titanium dioxide absorbs ultraviolet light with a wavelength less than 387.5nm, can it produce photocatalysis effect, while ultraviolet light can cause certain pollution and damage to the environment and humans, which greatly limits the application of titanium dioxide
In order to overcome this weakness, researchers at home and abroad often use compound semiconductor or surface sensitization technology to expand the spectral absorption range of titanium dioxide to the visible light region, but the photocatalytic performance of titanium dioxide is limited, because these two technologies are photosensitizers. Or the valence band electrons of narrow-band semiconductors are excited to the conduction band of titanium dioxide, and holes with high oxidation activity are not generated on the valence band of titanium dioxide, and the holes can be adsorbed on the surface of catalyst particles with OH - or H 2 O reacts to generate OH - ,·OH - It is a more active and the main oxidizing species in the photocatalytic system. It can non-selectively oxidize and mineralize a variety of organic substances. Although photogenerated electrons can also interact with O 2 function to generate HO 2 · or O 2 - The same active oxygen species, but its oxidation ability is much weaker than that of holes

Method used

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  • Synthesis and surface decorating method of rare-earth nanometer compound material
  • Synthesis and surface decorating method of rare-earth nanometer compound material
  • Synthesis and surface decorating method of rare-earth nanometer compound material

Examples

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Synthetic example 1

[0023] Take 16 mL of absolute ethanol, add 3.4 mL of butyl titanate, 2.0 mL of glacial acetic acid and 1.0 mL of water, stir for 30 minutes, then add 2.0 mL of Er(NO 3 ) 3 and 2.0mLYb(NO 3 ) 3 The solution was stirred vigorously for 1 hour, and the resulting gel was vacuum-dried at 60° C. for 24 hours, and then calcined in a muffle furnace at 600° C. for 4 hours to obtain Er / Yb ion-co-doped nano-titanium dioxide crystal powder.

Synthetic example 2

[0025] Take 16 mL of absolute ethanol, add 3.4 mL of butyl titanate, 2.0 mL of glacial acetic acid and 1.0 mL of water, stir for 60 minutes, then add 2.0 mL of Tm(NO 3 ) 3 and 1.0mLYb(NO 3 ) 3 The solution was stirred vigorously for 1 hour, and the resulting gel was vacuum-dried at 50° C. for 48 hours, and then calcined in a muffle furnace at 600° C. for 4 hours to obtain Tm / Yb ion-co-doped nano titanium dioxide crystal powder.

Synthetic example 3

[0027] Take 16 mL of absolute ethanol, add 3.4 mL of butyl titanate, 2.0 mL of glacial acetic acid and 1.0 mL of water, stir for 30 minutes, then add 2.0 mL of Er(NO 3 ) 3 , 2.0mLYb(NO 3 ) 3 and 2.0mL 0.01mol / L Fe(NO 3 ) 3 The solution was stirred vigorously for 1.5 hours, and the resulting gel was vacuum-dried at 60° C. for 24 hours, and then calcined in a muffle furnace at 800° C. for 4 hours to obtain Er / Yb / Fe co-doped nano titanium dioxide crystal powder.

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Abstract

The invention belongs to the technical field of material chemistry and material physics, and in particular relates to a synthesis and surface decorating method of rare-earth nanometer compound materials. The invention prepares the rare-earth nanometer compound materials by the steps of the hydrolysis of butyl titanate, the mixing of element solutions, surface decoration, high-temperature calcination, and the like and using a mixing and surface decorating technology of rare-earth elements and transitional metal elements. Under the irradiating illumination of near infrared lights or visible lights, and the rare-earth elements generate upconversion luminescence to excite titanium oxide to achieve anti-bacterium and anti-tumor functions. The invention has the characteristics of simple material synthesis method, multiple preparation technologies, easy-controlled combination, low cost, good modified effect on titanium oxide, and the like, does not pollute or harm the human and the environment, can directly kill bacteria and tumors and decompose the endotoxin generated by the bacteria and the tumors, and does not need secondary processing.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry and material physics, and in particular relates to a synthesis and surface modification method of a rare earth nanocomposite material. Background technique [0002] Titanium dioxide is a commonly used photocatalyst in the field of photocatalysis, but since the bandgap width of titanium dioxide is 3.2eV, its corresponding absorption wavelength is 387.5nm, that is, only when titanium dioxide absorbs ultraviolet light with a wavelength less than 387.5nm, can it produce photocatalysis effect, while ultraviolet light can cause certain pollution and damage to the environment and human beings, which greatly limits the application of titanium dioxide. In order to overcome this weakness, researchers at home and abroad often use compound semiconductor or surface sensitization technology to expand the spectral absorption range of titanium dioxide to the visible light region, but the photocatalyti...

Claims

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Application Information

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IPC IPC(8): A61K33/24A61K41/00A61P31/04A61P35/00
Inventor 尚庆坤朱东霞于辉王文兰赵娜娜解晓青
Owner NORTHEAST NORMAL UNIVERSITY
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