PR<3+>:Y2SiO5/TiO2 photocatalytic composite film based on glass fiber filter film carrier, preparation method and application thereof

A technology of glass fiber and composite film, which is applied in the field of optical materials, can solve the problems of energy consumption of suspended nano-catalysts in post-processing, limited light penetration into suspensions, easy aggregation and sedimentation of powders, etc., to achieve improved photocatalytic performance and good chemical stability , the effect of combining moderate strength

Inactive Publication Date: 2015-09-23
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] (1) Ag-TiO as prepared in Document 1 2 Thin films can only degrade pollutants better under ultraviolet light, and the doped silver is expensive
[0009] (2) For example, in literatures 2 and 3, the photocatalytic research on titanium dioxide is carried out by dispersing it in the form of powder suspension in the solution, and the post-treatment and recycling of suspended nano-catalysts are very energy-consuming and cannot be recycled; And the light penetration into the suspension is very limited, which directly leads to a significant decrease in the degradation effect
[0010] (3) As in Documents 2 and 3, it is dispersed in the waste liquid in the form of powder suspension, but the operation in a large-scale suspension has great limitations, and the powder is easy to agglomerate and settle, which is not conducive to photocatalytic degradation

Method used

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  • PR&lt;3+&gt;:Y2SiO5/TiO2 photocatalytic composite film based on glass fiber filter film carrier, preparation method and application thereof
  • PR&lt;3+&gt;:Y2SiO5/TiO2 photocatalytic composite film based on glass fiber filter film carrier, preparation method and application thereof
  • PR&lt;3+&gt;:Y2SiO5/TiO2 photocatalytic composite film based on glass fiber filter film carrier, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Pr 3+ :Y 2 SiO 5 / TiO 2 Preparation of photocatalytic composite film

[0044] (1) Preparation of Pr by sol-gel method 3+ 1.0% (mol) of Pr 3+ :Y 2 SiO 5 , Take Y 2 O 3 Join HNO 3 Medium configuration Y (NO 3 ) 3 Solution, accurately measure Pr(NO 3 ) 3 Join Y(NO 3 ) 3 The solution is heated and boiled in an electric furnace. The white anhydrous nitrate is obtained by evaporating and drying in an oven for several hours; adding distilled water and absolute ethanol to completely dissolve it, adding TEOS and stirring for 30 minutes, and then putting it in a water bath at 80℃ to heat to form a gel; Dry in an oven at 104°C for 12 hours to obtain a dry gel and grind it into powder. Place it in a muffle furnace at 950°C for 3 hours and then cool to obtain 1.0% (mol) Pr 3+ :Y 2 SiO 5 Powder.

[0045] (2) Prepare titanium dioxide sol by the sol-gel method, use tetrabutyl titanate as the precursor, dissolve it in absolute ethanol (2V / 3), add the hydrolysis inhibitor acetylacetone, and ad...

Embodiment 2

[0049] Material performance characterization test

[0050] 1. 1% (mol) Pr 3+ :Y 2 SiO 5 Powder up-conversion luminescence performance test (fluorescence FS test)

[0051] Pr 3+ :Y 2 SiO 5 The up-conversion luminescence performance such as figure 2 As shown, the FL3-TCSPC fluorescence spectrometer is used to test, and the test conditions are: excitation wavelength ex=488nm, filter wavelength KV=370nm, slit width slit=1nm. Observed figure 2 It can be seen that at the excitation wavelength ex=488nm, 1% (mol) Pr 3+ :Y 2 SiO 5 The powder can emit strong ultraviolet light in the wavelength range of 290nm to 340nm, which can be used by nanometer titanium dioxide.

[0052] 2. X-ray diffraction analysis (XRD)

[0053] X-ray diffraction analysis such as Figure 4 As shown, the D8ADVANCE X-ray diffractometer (XRD) produced by Bruker in Germany is used for phase analysis of the sample; the test conditions are: graphite monochromator, Cu-Kα radiation, radiation wavelength λ=0.15418nm, tube volta...

Embodiment 3

[0057] Degradation performance test under visible light

[0058] 1. 1% (mol) Pr 3+ :Y 2 SiO 5 With TiO 2 Best quality ratio

[0059] First configure the nitrobenzene solution with the concentration of 1mg / L, 3mg / L, 5mg / L, 7mg / L, 10mg / L, 15mg / L, and then use the UV spectrophotometer to measure the nitrobenzene at each concentration For the absorbance of the solution, take the concentration of the nitrobenzene solution as the abscissa and the absorbance as the ordinate to make a standard curve.

[0060] Take 600ml of 5mg / L nitrobenzene solution as the target degradation solution. Under 140W intensity of the three primary colors, take the total mass of the composite material to 0.4g, of which 1% (mol) Pr 3+ :Y 2 SiO 5 With TiO 2 According to the mass ratio of 2%, 3%, 4%, 5%, 6%, and 8% as the photocatalyst, put the material into the liquid to be degraded, turn on the stirring device, protect from light for 20 minutes, the adsorption equilibrium has been reached, and then Then turn on t...

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Abstract

The invention discloses a Pr<3+>:Y2SiO5/TiO2 photocatalytic composite film based on a glass fiber filter film carrier, a preparation method and an application thereof. The composite film is formed by loading 1% (mol) Pr<3+>:Y2SiO5/nano TiO2 on the surface of a glass fiber film, so that the photocatalytic performance of the material is improved by utilizing the synergistic effect of the glass fiber and the Pr<3+>:Y2SiO5. The composite film has good chemical stability, the advantages of Pr<3+>:Y2SiO5 and nano TiO2 photocatalyst can be effectively utilized, the pohotocatalytic degradation under the visible light can be carried out, and the energy is saved.

Description

Technical field [0001] The present invention relates to the field of optical materials, in particular to a Pr based on glass fiber filter membrane carrier 3+ :Y 2 SiO 5 / TiO 2 Photocatalytic composite film, preparation method and application thereof. Background technique [0002] Nano TiO 2 Among the various photocatalyst reports so far, it is the most widely used photocatalyst because of its high photocatalytic activity, high stability, low cost, and non-toxicity. TiO 2 As a photocatalyst, it is widely used to treat various waste water. But TiO 2 Can only absorb wavelength λ Only under the excitation of ultraviolet radiation of <387nm can it have the ability of photocatalytic redox, and the catalytic activity is very low under sunlight. This is because of TiO 2 The band is relatively wide, and the excitation light source can be limited to short-wavelength, high-frequency ultraviolet bands. However, ultraviolet rays in sunlight only account for 3%-5%, resulting in TiO 2 The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/30
CPCY02W10/37
Inventor 杨毅夏光志徐萌川刘颖颜学武
Owner NANJING UNIV OF SCI & TECH
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