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Polyethylene film loading type iron nitrogen co-doping titanium dioxide photocatalyst and preparation method thereof

A technology of titanium dioxide and photocatalyst, which is applied in the field of iron, nano-titanium dioxide photocatalysis, nitrogen co-doped nano-titanium dioxide powder preparation and low-density polyethylene film loading. question

Inactive Publication Date: 2010-06-02
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also disadvantages such as easy aggregation, difficult separation and recovery, and unsuitability for flow systems. Therefore, the development of suitable solid-supported catalysts is an effective way to overcome these shortcomings.

Method used

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  • Polyethylene film loading type iron nitrogen co-doping titanium dioxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0009] Example 1 Iron and nitrogen co-doped TiO at the same time 2 Preparation of powder catalyst

[0010] (1) Slowly add 10mL tetrabutyl titanate and 10mL acetic acid dropwise into 80mL absolute ethanol under vigorous stirring to obtain solution A;

[0011] (2) Add a small amount of ferric nitrate crystals, urea, 5 mL of acetic acid, and 6.25 mL of water into 25 mL of absolute ethanol to obtain solution B;

[0012] (3) Slowly add B to A under the condition of vigorous stirring, continue to stir for 3 hours after the dropwise addition, and leave to age for 24 hours to obtain a stable gel, and dry the gel at 80°C to obtain a dry gel;

[0013] (4) Grind the xerogel into powder and place it in a tubular resistance furnace for 3 hours at 500°C to obtain light yellow Fe and N co-doped with TiO 2 powder.

example 2

[0014] The LDPE membrane loading of example 2 powder catalysts

[0015] (1) Cut the LDPE film into a rectangle of 5×10 cm, soak it in isopropanol for a certain period of time, wash it with water, and dry it at room temperature for later use;

[0016] (2) Using isopropanol as a solvent, prepare Fe and N co-doped TiO 2 The suspension of powder catalyst is 100mL, the mass concentration of catalyst is 1g / L, fully stir with a magnetic stirrer, and let it stand for 24h;

[0017] (3) Soak the LDPE film in the suspension for 10 hours, hang it indoors to dry, and then place it in an oven for heat treatment at 105°C for 10 hours;

[0018] (4) Clean the heat-treated LDPE film with an ultrasonic cleaner for 15 minutes, rinse it with distilled water to remove the catalyst particles attached to the surface, and finally hang the film to dry to obtain the LDPE film-loaded Fe and N simultaneously. doped TiO 2 catalyst.

example 3

[0019] Example 3 The application example of photocatalytic degradation of diphenylamine (DPA)

[0020] Simultaneous co-doping of TiO with Fe and N supported on the prepared LDPE film 2 Catalyst The experiment of photocatalytic degradation of diphenylamine (DPA) was carried out, the concentration of DPA was 20 mg / L, and the initial pH of the solution was 3. The degradation rate of DPA was 80.11% when irradiated with 500W long-arc xenon lamp for 90 minutes, and the catalyst still had a high degradation rate after repeated use. The experimental results are shown in Table 1.

[0021] Table 1 Catalyst reuse experiment results

[0022]

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Abstract

The invention relates to the field of titanium dioxide photocatalyst, in particular to the field of a film loading type iron nitrogen co-doping titanium dioxide photocatalyst. The invention provides a preparation method for a flexible carrier (LDPE) film loading type iron nitrogen co-doping TiO2 catalyst. The catalyst contains an active constituent and a carrier. The iron nitrogen co-doping titanium dioxide, as the active constituent of the loading catalyst, is loaded on a low density polyethylene film carrier. The preparation method for photocatalyst is the sol-gel method. The loading method for catalyst is the dipping sediment-thermal treatment method. The invention has excellent photocatalysis oxidability under visible lights, has simple preparation process and can be reused.

Description

technical field [0001] The invention relates to the field of nano-titanium dioxide photocatalysis, in particular to the technical field of iron and nitrogen co-doped nano-titanium dioxide powder preparation and its low-density polyethylene (LDPE) film loading technology. The catalyst prepared by the method is particularly suitable for catalytic degradation of diphenylamine under visible light irradiation, and achieves a higher degradation rate. Background technique [0002] Nano-titanium dioxide has the characteristics of high specific surface area, high density, surface lattice defects and high specific surface energy. Mineralization, no secondary pollution and other advantages, has a wide range of application prospects. When the energy is greater than that of TiO 2 When the light of the forbidden band width irradiates the semiconductor, the photoexcited electrons jump to the conduction band to form conduction band electrons. At the same time, holes are left in the valenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38A62D3/10A62D101/26
Inventor 肖羽堂李志花许双双张永来张飞白
Owner NANKAI UNIV
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