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NaYF4:Yb,Tm/TiO2 composite nanofiber and preparation method thereof

A technology of composite nanofibers and nanoparticles, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high cost, complicated preparation method operation, poor photocatalytic effect, etc., and achieve cost Low cost, simple operation process, simple operation effect

Inactive Publication Date: 2015-12-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention provides a NaYF 4 :Yb,Tm / TiO 2 Nanofibers and their preparation methods solve the technical problems that the existing preparation methods are complex in operation, high in cost, poor in photocatalytic effect, and unsuitable for large-scale production.

Method used

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  • NaYF4:Yb,Tm/TiO2 composite nanofiber and preparation method thereof
  • NaYF4:Yb,Tm/TiO2 composite nanofiber and preparation method thereof
  • NaYF4:Yb,Tm/TiO2 composite nanofiber and preparation method thereof

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Embodiment 1

[0035] This embodiment prepares NaYF according to the following steps 4 :Yb,Tm / TiO 2 Composite nanofibers:

[0036] 1. Preparation of water-soluble NaYF 4 :Yb,Tm nanoparticles:

[0037] a. Weigh 0.1357gYCl 3 , 0.0838gYbCl 3 and 0.0014gTmCl 3 Put it into the reactor, add 5mL oleic acid and 15mL octadecene, stir evenly, heat to 150°C and keep it warm at this temperature for 0.5h to obtain a clear clear liquid; cool the clear clear liquid to room temperature, add 4mL solvent dropwise There are 0.3652gNH 4 F and 0.2464g NaOH methanol solution, stirred at room temperature for 0.5h, then heated to 150°C and kept for 0.5h to remove methanol, and finally heated to 240°C under nitrogen protection flow, kept for 2h to obtain NaYF 4 : Yb, Tm nanoparticles;

[0038] b. Weigh 100 mg of NaYF prepared in step a 4 : Yb, Tm nanoparticles in the flask, add 20mL of hydrochloric acid solution of pH 1 to disperse, stir at room temperature for 2h, and centrifuge to obtain water-soluble NaY...

Embodiment 2

[0048] This embodiment prepares NaYF according to the following steps 4 :Yb,Tm / TiO 2 Composite nanofibers:

[0049] 1. Preparation of water-soluble NaYF 4 :Yb,Tm nanoparticles:

[0050] a. Weigh 0.6845gYCl 3 , 0.4192gYbCl 3 and 0.007gTmCl 3 Put it into the reactor, add 10mL oleic acid and 10mL octadecene, stir evenly, heat to 80°C and keep it at this temperature for 2h to obtain a clear clear liquid; cool the clear clear liquid to room temperature, add 4mL of dissolved 1.826gNH 4 F and methanol solution of 1.232g NaOH, stirred and reacted at room temperature for 1h, then heated to 100°C and kept for 0.5h to remove methanol, and finally heated to 320°C under nitrogen protection flow, kept for 0.5h to obtain NaYF 4 : Yb, Tm nanoparticles;

[0051] b. Weigh 500 mg of NaYF prepared in step a 4 : Yb, Tm nanoparticles in a flask, add 20mL of pH 3 hydrochloric acid solution to disperse, stir at room temperature for 4h, and centrifuge to obtain water-soluble NaYF 4 : Yb, Tm ...

Embodiment 3

[0057] This embodiment prepares NaYF according to the following steps 4 :Yb,Tm / TiO 2 Composite nanofibers:

[0058] 1. Preparation of water-soluble NaYF 4 :Yb,Tm nanoparticles:

[0059] a. Weigh 0.1643gYCl 3 , 0.1013gYbCl 3 and 0.0017gTmCl 3 Put it into the reactor, add 6mL oleic acid and 14mL octadecene, stir evenly, heat to 130°C and keep warm at this temperature for 0.5h to obtain a clear clear liquid; cool the clear clear liquid to room temperature, and add 10mL of solvent dropwise There are 0.4276gNH 4 F and 0.3742g NaOH in methanol solution, stirred at room temperature for 2h, then heated to 80°C for 1h to remove methanol, and finally heated to 340°C under nitrogen protection flow, and kept for 0.5h to obtain NaYF 4 : Yb, Tm nanoparticles;

[0060] b. Weigh 200 mg of NaYF prepared in step a 4 : Yb, Tm nanoparticles in a flask, add 20mL of hydrochloric acid solution with pH 1.5 to disperse, stir at room temperature for 2.5h, and centrifuge to obtain water-soluble...

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Abstract

The invention discloses a NaYF4:Yb,Tm / TiO2 composite nanofiber and a preparation method thereof. The preparation method is characterized by comprising the steps that water-soluble NaYF4:Yb,Tm nano-particles are prepared first; then upconversion particles, an alcoholic solution, PVP, acetic acid and TBT are prepared into an electrostatic spinning mixed solution; the mixed solution is used for electrostatic spinning, so that a NaYF4:Yb,Tm / PVP / TBT nanofiber is obtained; at last, the nanofiber is calcined at a specific temperature, and accordingly the NaYF4:Yb,Tm / TiO2 nanofiber can be obtained. According to the NaYF4:Yb,Tm / TiO2 composite nanofiber and the preparation method thereof, the operation steps are simple, the quantity of chemical reagents used in the preparation process is small, production cost is low and mass production and preparation are facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a NaYF 4 :Yb,Tm / TiO 2 Preparation method of composite nanofiber. Background technique [0002] TiO 2 As an important semiconductor photocatalytic material, when illuminated, electrons in the valence band are excited to the conduction band, thereby forming highly active electrons in the conduction band and valence band (e - ) and holes (h + ), which react with dissolved oxygen and water molecules respectively to produce highly active and strong oxidizing superoxide radicals (O 2 - ), singlet oxygen ( 1 o 2 ) and hydroxyl radicals (OH), etc., can degrade organic matter in water into CO 2 and H 2 O. However, TiO 2 Due to its own wide bandgap characteristics, it can only absorb ultraviolet light with an energy greater than or equal to 3.2eV to cause photocatalytic reactions, and the radiation energy in the ultraviolet region only accounts for about 5% of t...

Claims

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Application Information

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IPC IPC(8): D01F9/08B82Y30/00B82Y40/00
Inventor 钱海生章富郝梨娜王婉妮黄晨曦彭庭友苏晨张丽婷
Owner HEFEI UNIV OF TECH
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