Preparation and application of oil-water amphiphilic titanium-based Ag/TiO2@PANI photocatalyst

A photocatalyst and amphiphilic technology, applied in the field of photocatalysis, can solve the problems of low adsorption of organic waste gas and low photocatalytic efficiency, and achieve the effects of improving the utilization rate of solar energy, simple production method and increasing lipophilicity

Pending Publication Date: 2021-11-12
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Aiming at the problems of low photocatalyst adsorption to organic waste gas and low photocatalytic efficiency in the prior art, the present invention provides an oil-water amphiphilic titanium-based photocatalyst with a simple preparation method, and applies it to gas-liquid under normal temperature and pressure Solid three-phase photocatalytic degradation of VOCs waste gas system

Method used

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  • Preparation and application of oil-water amphiphilic titanium-based Ag/TiO2@PANI photocatalyst
  • Preparation and application of oil-water amphiphilic titanium-based Ag/TiO2@PANI photocatalyst
  • Preparation and application of oil-water amphiphilic titanium-based Ag/TiO2@PANI photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 Preparation of oil-water amphiphilic titanium-based photocatalyst

[0026] At room temperature, weigh 20mmolAgNO 3 (3.4g) was dissolved in 200mL water, and 1mol (79.9g) of TiO with a particle size of 25nm was added 2 (Model: P25), and then stirred by a magnetic stirrer at 600rpm for 30min to obtain a white suspension, then pour the white suspension into a high-pressure reaction kettle, put it into an oven, and conduct hydrothermal crystallization at 160°C for 24h, the obtained reaction Suction filtration, the filter cake was washed with deionized water and absolute ethanol, then placed in a vacuum oven, and dried in vacuum at 80°C for 12h to obtain Ag / TiO 2 Photocatalyst; weigh 0.1g ammonium persulfate and 20g Ag / TiO 2 Mix evenly by mechanical stirring, then add 100uL aniline (the density is 1.02g / cm under standard conditions, about 102mg) and stir rapidly. After 30min of reaction, grind to obtain powder (to facilitate subsequent tests and disperse in the...

Embodiment 2

[0031] Example 2 Photocatalytic degradation of toluene 1 by oil-water amphiphilic titanium-based photocatalyst

[0032] Add 200ml of pure water into the photocatalytic reactor, then put in a 4W 365nm ultraviolet lamp, seal the device, start stirring, and feed 500ppm of toluene-air mixture while turning on the ultraviolet lamp, and connect the reaction tail gas to the gas chromatograph. Determine the initial toluene concentration in the tail gas. Add 0.1 g Ag / TiO to the photocatalytic reactor 2 @PANI and 200ml of pure water, then put in a 4W UV lamp, seal the device, start stirring, and feed 500ppm of toluene-air mixture while turning on the UV lamp, connect the reaction tail gas to a gas chromatograph, and measure the toluene in the tail gas concentration.

[0033] The experimental results show that at room temperature, the space velocity is 100000ml h -1 g -1 , catalyst feed 0.1g, water 80mL, 4W365nm ultraviolet light source, and under the conditions of 500ppm toluene, th...

Embodiment 3

[0034] Example 3 Photocatalytic degradation of toluene 2 by oil-water amphiphilic titanium-based photocatalyst

[0035] Add 370ml of pure water into the photocatalytic reactor, then put in a 100W high-pressure mercury lamp, seal the device, start stirring, and feed 1000ppm of toluene-air mixture while turning on the high-pressure mercury lamp, and connect the reaction tail gas to the gas chromatograph , to determine the initial toluene concentration in the tail gas. Add 0.1 g Ag / TiO to the photocatalytic reactor 2 @PANI and 370ml of pure water, then put in a 100W high-pressure mercury lamp, seal the device, start stirring, and feed 1000ppm of toluene-air mixture while turning on the high-pressure mercury lamp. The reaction tail gas was connected to a gas chromatograph to measure the concentration of toluene in the tail gas.

[0036] The experimental results show that at room temperature, the space velocity is 100000ml h -1 g -1 , under the conditions of feeding 0.1g of cat...

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Abstract

The invention provides an oil-water amphiphilic titanium-based photocatalyst, which is prepared according to the following method: at room temperature, an initiator and a TiO2 base material are uniformly mixed, and then an organic polymer semiconductor monomer is added and rapidly stirred for 10 minutes to 2 hours to obtain the oil-water amphiphilic titanium-based photocatalyst. According to the oil-water amphiphilic titanium-based photocatalyst, while the hydrophilicity of a titanium-based material is reserved, an organic semiconductor is wrapped by a mechanochemical method to form an organic-inorganic heterojunction, so that the lipophilicity of the titanium-based material is increased, an excitation spectrum is expanded to a visible light wave band, and the recombination rate of photo-induced electrons and holes is reduced, so that the solar energy utilization rate of the titanium-based material is improved. The manufacturing method is simple, the structure is stable, and repeated use is achieved.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to an oil-water amphiphilic titanium-based Ag / TiO 2 Preparation of @PANI photocatalyst and its application in VOCs degradation. Background technique [0002] Photocatalytic degradation technology is a very promising degradation technology in the field of organic wastewater and industrial VOCs waste gas treatment. Due to the mild conditions, environmental friendliness and strong universality, compared with catalytic combustion and biodegradation methods, it has obvious advantages in the working conditions of medium and low VOCs concentration and VOCs containing heteroatoms. TiO 2 Photogenerated holes have strong oxidative properties and good chemical stability, and have been considered as one of the most suitable photocatalysts for VOCs degradation. According to literature reports, most industrial and indoor organic waste gases can be treated by TiO 2 Degradation, even complete oxid...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01D53/86B01D53/44B01D53/72
CPCB01J31/069B01D53/8687B01D53/864B01D53/8668B01D2257/708B01J35/39
Inventor 卢晗锋朱秋莲莫颖夏妍妍郑煜榛廖生藩
Owner ZHEJIANG UNIV OF TECH
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