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TiO2/NaYF4 composite material and preparation method thereof

A composite material and hydrothermal technology, applied in the field of TiO2/NaYF4 composite material and its preparation, can solve the problems of no obvious breakthrough in photocatalytic efficiency, secondary pollution stability, low photocatalytic ability, etc. The effect of wavelength range, low price, and high photocatalytic ability

Inactive Publication Date: 2015-05-13
QINGHAI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, noble metal doping and organic dye sensitization methods have disadvantages such as high cost, secondary pollution and poor stability; and other semiconductors such as TiO 2 / CdS,TiO 2 / CdSe,TiO 2 / WO 3 Equal recombination, the forbidden band width of the prepared semiconductor is certain, the light absorption range remains unchanged, and the electron-hole pairs are easy to recombine, so the photocatalytic ability is still low
Another way is to increase the TiO 2 Its own activation sites, such as the preparation of nanosheets, nanotubes and nanowires with high-energy surface tropism, not only improve the TiO 2 The specific surface area, but also increased the number of active sites, but its own band gap remains unchanged, so the photocatalytic efficiency still will not have a significant breakthrough

Method used

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  • TiO2/NaYF4 composite material and preparation method thereof
  • TiO2/NaYF4 composite material and preparation method thereof
  • TiO2/NaYF4 composite material and preparation method thereof

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preparation example Construction

[0039] On the other hand, if figure 1 As shown, the embodiment of the present invention also provides a TiO 2 / NaYF 4 The preparation method of composite material may comprise the steps of:

[0040] S1. Preparation of Rare Earth Doped NaYF 4 , the doped rare earth elements include sensitizers and activators;

[0041] S2, preparation of TiO 2 / NaYF 4 composite material, wherein the TiO 2 / NaYF 4 TiO in composites 2 NaYF doped with the rare earth 4 form a heterojunction structure.

[0042] The TiO that the embodiment of the present invention provides 2 / NaYF 4 Composite material preparation method, NaYF in the composite material 4 Rare earth doped NaYF 4 , and TiO 2 NaYF doped with rare earth 4 A heterojunction structure is formed between them, and its forbidden band width is relative to that of pure TiO 2 In terms of materials, it is narrowed, resulting in a significant red shift phenomenon, which broadens the wavelength range of the composite material to absorb...

Embodiment 1

[0062] The invention discloses a TiO with high-efficiency photocatalytic performance 2 / NaYF 4 Composite material, its preparation method comprises the following steps:

[0063] 1. NaYF 4 :Er 3+ / Yb 3+ Preparation of microtubes: Dissolve 0.5g NaOH in 10mL deionized water completely, add 15mL n-butanol and 5mL oleic acid in sequence, stir well and add 1mL Y(NO 3 ) 3 , 1mL Er(NO 3 ) 3 and 1 mL of Yb(NO 3 ) 3 solution, finally add 4mL NaF solution with a concentration of 1mol / L, stir for 30min, then transfer to a 50mL hydrothermal kettle, and react hydrothermally at 180°C for 24h. After the hydrothermal reaction, it was naturally cooled to room temperature, washed several times with absolute ethanol and then dried.

[0064] 2. Configuration of butyl titanate solution: Dissolve 3 mL of butyl titanate in 15 mL of absolute ethanol and stir evenly, slowly add 0.3 mL of HCl and 0.6 mL of HF dropwise, stir evenly and place in a 30 mL hydrothermal kettle .

[0065] 3. TiO 2...

Embodiment 2

[0067] The preparation method of embodiment 2 is basically the same as that of embodiment 1, only step 3 is different, specifically, step 3 of embodiment 2 is:

[0068] TiO 2 / NaYF 4 :Er 3+ / Yb 3+ Preparation of composite materials: 0.05g NaYF 4 :Er 3+ / Yb 3+ Put the microtubes in 1mL of absolute ethanol and ultrasonically for 30 minutes to disperse the microtubes evenly, then put them into the butyl titanate solution, stir evenly, and heat up from room temperature to The hydrothermal reaction was carried out at 180° C. for 24 hours. After the reaction was completed, it was cooled to room temperature, and the obtained white powder was washed four times with alcohol, and dried in a drying oven at 60°C. The particle size of titanium dioxide nanoparticles in the composite material is about 10-30 nm, uniformly distributed in NaYF 4 surface of the microtube.

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Abstract

The invention discloses a TiO2 / NaYF4 composite material and a preparation method thereof, and relates to the technical field of photocatalysis. The composite material is higher in photocatalysis capability, low in cost, safe, pollution-free and higher in stability. The invention discloses theTiO2 / NaYF4 composite material, wherein NaYF4 in the TiO2 / NaYF4 composite material is rare earth doped NaYF4, and doped rare earth elements comprise a sensitizing agent and an activating agent; a heterogeneous structure is formed between TiO2 and the rare earth doped NaYF4 in the TiO2 / NaYF4 composite material. The TiO2 / NaYF4 composite material and the preparation method thereof disclosed by the invention are suitable for the photocatalysis process of semiconductor nanomaterials.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a TiO 2 / NaYF 4 Composite materials and methods for their preparation. Background technique [0002] In today's rapid economic development, how to solve the increasingly severe environmental problems is related to the survival and development of human beings. As an ideal photocatalytic semiconductor material, TiO 2 Because of its non-toxic, high activity, good physical and chemical stability, and large specific surface area, it has attracted widespread attention. It can completely decompose pollutants, odors, bacteria, formaldehyde, xylene and other harmful organic substances into CO 2 and H 2 O. However TiO 2 The forbidden band width is 3.2eV, and it can only absorb and utilize ultraviolet light with a wavelength less than 387nm, which accounts for 4% of solar energy, but has no absorption for visible light and 44% of infrared light, which account for 48% of solar e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135
Inventor 马元良李海琴
Owner QINGHAI UNIV FOR NATITIES
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