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Preparation method and application of dye-sensitized heteropolyacid catalyst with visible light photocatalytic activity

A technology of photocatalytic activity and dye sensitization, applied in the field of photocatalysts, can solve the problems of limited reuse, visible light not being utilized by heteropoly acids, etc., and achieve the effect of wide application prospects and high catalytic degradation effect

Inactive Publication Date: 2013-03-13
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In sunlight, ultraviolet light only accounts for 5%, and 43% of visible light is not utilized by heteropolyacids.
In addition, heteropolyacids are highly soluble in water, which limits their reuse.
Therefore, it is of great significance to design a new type of heteropolyacid photocatalytic material to solve the problem that heteropolyacids can only catalyze the degradation of dyes in the ultraviolet region and are easily soluble in water.

Method used

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  • Preparation method and application of dye-sensitized heteropolyacid catalyst with visible light photocatalytic activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Dye-sensitized H 3 PW 12 o 40 Preparation of photocatalyst

[0012] According to Thiogen and H 3 PW 12 o 40 The molar ratio of the substance is 3:1, slowly add the 0.1mM / ml thionium aqueous solution to the 0.1mM / ml H 3 PW 12 o 40 In the aqueous solution, the mixed solution was stirred and reacted at room temperature for 5 hours, and a dark purple precipitate was obtained. After centrifugation, the precipitate was washed with distilled water until the clear liquid was colorless, and dried in an oven at 50°C for 5 hours to obtain dye-sensitized H 3 PW 12 o 40 catalyst of light.

[0013] Dye-sensitized H 3 PW 12 o 40 The solid-state ultraviolet-visible diffuse reflectance spectrum characterization of the catalyst was carried out on a Lambda-900 ultraviolet-visible spectrometer produced by PerkinElmer, USA. The ultraviolet-visible diffuse reflectance spectrum shows that the dye-sensitized catalyst has a large absorption in the visible region of 400...

Embodiment 2

[0014] Example 2: Dye-sensitized H 3 PW 12 o 40 Photocatalytic degradation of methyl orange (MO) under visible light

[0015] Take 5 ml MO (10 mg / L) into a quartz test tube, and then add 30 mg of dye-sensitized H 3 PW 12 o 40 The catalyst is illuminated with a CHF-XM35-500W xenon lamp, and a filter is added on the surface of the test tube to filter out light waves below 420nm. During the illumination process, it is cooled with cooling water and the temperature is kept at 20°C. The catalyst was irradiated under xenon lamp for a certain period of time, and the catalyst was separated by centrifugation, and the methyl orange solution was measured with a Lambda-900 UV-visible spectrometer produced by PE Company to measure the change of the methyl orange UV-visible absorption spectrum of the dye during the illumination process, and the reaction was measured. The absorption value of the liquid at the wavelength of maximum absorption Carry out blank and control experiments at t...

Embodiment 3

[0021] Example 3: Dye Sensitization H 3 PW 12 o 40 Photocatalytic degradation of rose bengal (RhB) under visible light.

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Abstract

A preparation method and an application of a dye-sensitized heteropolyacid catalyst with visible light photocatalytic activity. The dye-sensitized heteropolyacid catalyst comprises MX12O40<(8-m)-> (M=P, Co, B, Si, As, Ge; X=W, Mo; m is the charge number of the metal ion M), and thionine, and is prepared by a chemical coprecipitation method. The chemical coprecipitation method is simple, and the obtained material is insoluble in water. The material can degrade methyl orange, rose Bengal or organic dyes with a same chromophore as the organic dyes mentioned above in visible light with high efficiency, and has potential application prospects in aspects of environmental protection and energy saving.

Description

technical field [0001] The invention relates to a photocatalyst constructed from heteropolyacid-thionine, in particular to a dye-sensitized heteropolyacid catalyst with high catalytic activity in the visible light range. Background technique [0002] With the development of human society, the problem of water pollution is becoming more and more serious. Pollutants include pesticides, heavy metal ions and organic dyes. At present, as one of the main pollution problems, the problem of organic dyes polluting water resources has attracted more and more attention. Since the 1980s, photocatalytic dye degradation technology has provided a good way for people to deal with the problem of dye polluted water resources. A lot of research in the past has focused on the photocatalytic degradation of dyes by ultraviolet light, especially the photocatalytic degradation of dyes by titanium dioxide has attracted much attention. Heteropolyacid is a material with a similar energy band struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/34B01J37/03C02F1/30
Inventor 尤阳立军高水英曹荣
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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