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Pr<3+>:Y2SiO5-TiO2-ACF visible-light response type photocatalytic composite membrane and preparation method thereof

A composite film and visible light technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of separation and recovery of suspended nano-catalysts, powders are easy to agglomerate and settle, Reduce the photocatalytic effect and other problems, achieve good visible photocatalytic performance, improve photocatalytic performance, and good chemical stability

Inactive Publication Date: 2016-11-23
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] (2) For example, in literatures 1 and 2, the photocatalytic research on titanium dioxide is carried out by dispersing it in the form of nano-powder suspension in the solution. After the reaction, the separation and recovery of suspended nano-catalysts are very troublesome and not convenient for recycling. ; and the suspended phase particles block the penetration of light from each other, reducing the photocatalytic effect
[0010] (3) Er based on spherical activated carbon as the carrier prepared in literature 3 3+ :YFeO 3 / TiO 2 - The SAC composite catalyst is dispersed in a fixed bed in the form of powder suspension and reacts. The powders collide with each other and cause the catalyst on the carrier to fall off. At the same time, the powder is easy to agglomerate and settle, which is not conducive to photocatalytic degradation. In addition, the suspended phase particles in the literature 1 and 2 block each other. Light transmission, resulting in waste of photons

Method used

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  • Pr&lt;3+&gt;:Y2SiO5-TiO2-ACF visible-light response type photocatalytic composite membrane and preparation method thereof
  • Pr&lt;3+&gt;:Y2SiO5-TiO2-ACF visible-light response type photocatalytic composite membrane and preparation method thereof
  • Pr&lt;3+&gt;:Y2SiO5-TiO2-ACF visible-light response type photocatalytic composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] PR 3+ :Y 2 SiO 5 / TiO 2 Preparation of Photocatalytic Composite Films

[0043] (1) Preparation of Pr by sol-gel method 3+ Pr content of 1.0% (mol) 3+ :Y 2 SiO 5 Up-conversion material powder. First take a certain amount of Y 2 o 3 Add dilute HNO 3 (dilute nitric acid and water 1:1) to configure Y(NO 3 ) 3 Solution, accurately measure a certain amount of Pr(NO 3 ) 3 Join Y(NO 3 ) 3 Solution, heating and boiling in an electric furnace to crystallize, drying in an oven at 110°C for several hours to obtain white anhydrous nitrate; Stir for 30 minutes, then heat in a water bath at 80°C to form a gel; dry the gel in an oven at 110°C for 12 hours, and grind the xerogel into a powder, place it in a muffle furnace for calcination at 900°C for 3 hours, and cool to obtain 1.0% (mol )Pr 3+ :Y 2 SiO 5 Phosphor.

[0044] (2) Using the sol-gel method, prepare a certain viscosity titanium dioxide sol with tetrabutyl titanate, glacial acetic acid, absolute ethanol, ...

Embodiment 2

[0048] Material Performance Characterization Testing

[0049] 1. X-ray diffraction analysis (XRD)

[0050] X-ray diffraction analysis such as figure 2 As shown, the sample was analyzed by D8 ADVANCE X-ray diffractometer (XRD) produced by German Bruker Company; the test conditions were: graphite monochromator, Cu-Kα radiation, radiation wavelength λ=0.15418 nm, tube voltage 40 kV, tube current 40 mA, scan speed 8~10 o min -1 , scanning angle range 2θ=10~80 o . Observed figure 2 It can be seen that the XRD of the phosphor powder after calcination at 900°C, the corresponding PDF standard library number of the spectrum is PDF#41-0004, indicating that the main component of the prepared sample is Y 2 SiO 5 . TiO after 800℃ treatment 2 The XRD diffraction pattern of / ACF diaphragm has the strongest diffraction peak at 2θ=27.5°, and the prepared TiO 2 / ACF film TiO 2 Mainly rutile phase, the corresponding PDF card number is #73-1765. After high temperature treatment at ...

Embodiment 3

[0060] Degradation performance test under visible light

[0061] 1. Pr in the composite film 3+ :Y 2 SiO 5 with TiO 2 best mass ratio

[0062] First prepare methylene blue solutions with concentrations of 1mg / L, 3mg / L, 5mg / L, 10mg / L, 15mg / L, and 20mg / L, and then use an ultraviolet spectrophotometer to measure its absorbance at a wavelength of 665nm. The concentration is the abscissa, and the absorbance is the ordinate to make a standard curve.

[0063] Using 500ml of 15mg / L methylene blue solution as the target degradation solution, under the irradiation of trichromatic light at 140W intensity, take composite films of the same size (wherein Pr 3+ :Y 2 SiO 5 with TiO 2 According to the mass ratio (5%, 7%, 9%, 11%, 13%) into the solution to be degraded, turn on the stirring device, and then turn on the light source to carry out the degradation experiment for 12 hours. The change curve of the removal rate with time is as follows: Figure 7 shown by Figure 7 It can be s...

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Abstract

The invention discloses a Pr<3+>:Y2SiO5-TiO2-ACF visible-light response type photocatalytic composite membrane and a preparation method thereof. The composite membrane is prepared by loading nano-TiO2 doped with Pr<3+>:Y2SiO5 to the surface of an activated carbon fiber. The composite membrane can solve the separating and recycling problems of a catalyst obtained after pollutant treatment and also can reuse the catalyst, and meanwhile a substrate enrichment environment can be generated on the surface of TiO2 through the high adsorption property of the activated carbon fiber, so that the contact chance of the catalyst and the pollutants is increased; accordingly, the prepared Pr<3+>:Y2SiO5-TiO2 composite material based on the activated carbon fiber carrier can achieve a synergistic effect of adsorption and photocatalysis, improve the pollutant removing efficiency and particularly achieves a good effect when the composite material is used for visible-light catalytic degradation on methylene blue.

Description

technical field [0001] The invention relates to the field of visible light responsive inorganic membranes, in particular to a Pr 3+ :Y 2 SiO 5 / TiO 2 / ACF visible light responsive photocatalytic composite film and its preparation method. Background technique [0002] In recent years TiO 2 It is widely used in various fields, such as photocatalytic technology, antibacterial agent, solar cell and self-cleaning coating surface, etc. Among them, in photocatalytic technology, due to the TiO 2 Pollutants on the surface can be decomposed and oxidatively degraded, so it is widely used in water and air purification. Although TiO 2 It has high photocatalytic activity, but due to the limitation of its own band gap, it can only absorb ultraviolet rays (at λ<387nm, accounting for about 4% of sunlight), and the utilization rate of visible light is very low. Therefore, in order to be more effective How to modify modified TiO to make full use of solar energy 2 Making it respond t...

Claims

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Application Information

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IPC IPC(8): B01J23/10C02F1/30
CPCC02F1/30B01J23/10B01J37/0211B01J37/0213C02F2305/10C02F2101/30B01J35/59B01J35/39Y02W10/37
Inventor 杨毅徐萌川王亚淼茆平颜学武刘颖
Owner NANJING UNIV OF SCI & TECH
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