Preparation method of visible light catalyst with surface plasmon effect and application thereof

A surface plasmon and catalyst technology, applied in the field of photocatalysis, can solve the problems of low utilization rate of active components, uneven dispersion of gold particles, difficult particle size control, etc. Simple and easy preparation method

Inactive Publication Date: 2012-02-15
FUZHOU UNIV
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Problems solved by technology

However, there are still many shortcomings in the above method, for example: the prepared gold particles are easy to cause a large amount of agglomeration of gold particles during the reduction process, which often leads to the average particle size of Au particles being greater than 20nm, difficult to control the particle size, and the presence of gold particles in the catalyst. Problems such as uneven surface dispersion and low utilization of active components

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  • Preparation method of visible light catalyst with surface plasmon effect and application thereof
  • Preparation method of visible light catalyst with surface plasmon effect and application thereof
  • Preparation method of visible light catalyst with surface plasmon effect and application thereof

Examples

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preparation example Construction

[0024] (1) Anatase TiO 2 The preparation steps of the carrier are as follows: add 25mL n-tetrabutyl titanate and 3mL hydrofluoric acid into the autoclave, stir evenly at room temperature, seal the autoclave, put it in an oven at 150-200°C for 12-48h, and wash it several times Centrifuge, dry and grind to get anatase TiO 2 .

[0025] (2) The preparation steps of zirconia carrier are as follows: add 25mL zirconia chloride and 3mL sodium hydroxide solution with a concentration of 1.0M into the autoclave, stir well at room temperature, put it in an oven at 150-200℃ for 12-48h , washed and centrifuged several times, dried and ground to obtain zirconia.

[0026] (3) Other carriers (rutile TiO 2 , CeO 2 , SiO 2 、 Ta 2 o 5 、Al 2 o 3 , Nb 2 o 5 ) from Alfa Aesar company, the particle size range is 40-500 nm.

[0027] (4) Add 80mL of ethylene glycol and 0.1-1g of carrier into a round-bottomed flask, ultrasonicate for 10-20min with an ultrasonic power of 100W, stir vigorously f...

Embodiment 1

[0029] Preparation of Visible Light Catalyst with Surface Plasmon Effect

[0030] 80mL of ethylene glycol and 0.5g of TiO 2 Put it into a round-bottom flask, ultrasonically disperse, stir evenly, put it into an oil bath, heat it to 120°C, and after a period of argon gas flow, add 3mL of sodium hydrosulfide in ethylene glycol solution (3mmol / L) and 15mL of ethylene glycol solution of polyvinylpyrrolidone (0.18mol / L), then add 2mL of HAuCl 4 solution (10mg / mL), after 2h of reaction, the round bottom flask was transferred to an ice-water bath. After cooling, several times of centrifugation, washing with deionized water, and drying, the visible light catalyst is obtained. figure 1 The ultraviolet-visible diffuse reflection diagram of the visible light catalyst with surface plasmon effect synthesized by this preparation method is shown. It can be found from the figure that the prepared catalyst has a strong SPR characteristic absorption peak of Au at 550 nm.

Embodiment 2

[0032] Visible light photocatalyst degradation of rhodamine B with surface plasmon effect

[0033] The obtained visible light photocatalyst with surface plasmon effect is used for photocatalytic degradation of Rhodamine B, and 80 mg sample is weighed and added to 80 mL RhB solution (10 -5 mol / L), and stirred for 1 h in the dark, so that the RhB solution reached the adsorption / desorption equilibrium on the surface of the catalyst, and then turned on the light source to carry out the photocatalytic reaction. The photodegradation uses a xenon lamp (greater than 420nm), and the photodegradation amount of rhodamine B is detected by a Cary-500 spectrophotometer. The photodegradation of rhodamine B under different conditions is as follows: figure 2 shown. It can be seen from the figure that rhodamine B basically does not degrade when no catalyst is added, and the catalysts of different supports all show good visible light catalytic activity, among which the activity of titanium di...

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Abstract

The invention relates to a preparation method of a visible light catalyst with a surface plasmon effect and application thereof. The active component of the visible light catalyst is a precious metal Au, and the carrier is one of TiO2, CeO2, Nb2O5, SiO2, Ta2O5, Al2O3 and ZrO2, wherein, Au accounts for 0.2-5% in mass content, and the particle size of Au particle is 2-20nm. Preparation of the catalyst consists of two steps: the first step is to prepare a carrier; the second step is to prepare an Au/TiO2 (CeO2, SiO2, Al2O3, Nb2O5, Ta2O5, ZrO2) visible light catalyst with a plasmon effect througha sol precipitation method. Au nanoparticles prepared by the method of the invention have good dispersibility, easily controllable size, high active component utilization rate, as well as the effect of high efficiency photocatalytic degradation of organic pollutants by visible light.

Description

technical field [0001] The invention belongs to photocatalysis technology in environmental treatment, in particular to a preparation method and application of a visible light photocatalyst which has a surface plasmon effect and can efficiently degrade organic pollutants. [0002] Background technique [0003] At present, the methods of air purification and wastewater treatment mainly include: physical adsorption method, chemical neutralization method, etc., but the above methods have disadvantages such as adsorption saturation, complicated manufacturing, high cost and non-recyclable reuse. With the development of photocatalytic technology, photocatalysts have been widely used in environmental treatment such as air purification and wastewater treatment. Traditional TiO 2 The wide bandgap photocatalyst is favored by people because of its high photocatalytic activity, strong oxidation ability, good chemical stability, non-toxicity, and low cost. It is currently the most widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/66B01J23/68B01J37/03A62D3/17A62D101/20
Inventor 刘平祝淑颖付贤智梁诗景戴文新陈旬李朝晖
Owner FUZHOU UNIV
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