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Semiconductor metallic oxide photocatalyst and preparation method and application thereof

An oxide and semiconductor technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, etc., to improve photocatalytic efficiency and high degradation effect of action

Active Publication Date: 2013-08-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

Using the layer-by-layer self-assembly method to modify the polyoxometalate-thionine composite thin film on the semiconductor metal oxide as a photocatalytic material for the degradation of organic dyes, especially the degradation of organic dyes using thionine-sensitized POMs and sunlight Not yet reported

Method used

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  • Semiconductor metallic oxide photocatalyst and preparation method and application thereof
  • Semiconductor metallic oxide photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: the preparation of semiconductor metal oxide

[0013] First, the preparation of tungsten trioxide: (1) strontium nitrate (Sr(NO 3 ) 2 , 2mmol) and sodium tungstate (Na 2 WO 4 2H 2 (2, 4mmol) were dissolved in 25ml water respectively, then mixed and stirred for 2 hours, centrifuged, and the precipitated strontium tungstate SrWO was collected 4 After drying at 70 °C, and then to SrWO 4 4M nitric acid (HNO 3 ) solution, soak it for 24 hours, centrifuge and dry it, then calcinate it at 500°C for 2 hours to obtain tungsten trioxide.

[0014] (2) Lead acetate (Pb(Ac) 2 ) and sodium tungstate (Na 2 WO 4 2H 2 O) In equimolar mixed ethylene glycol, add it to the polytetrafluoroethylene inner tube of the stainless steel reaction pot, keep the temperature at 160°C for 10 hours, wash and centrifuge to collect lead tungstate (PbWO 4 ), dried at 70°C, and then to PbWO 4 4M nitric acid HNO was added dropwise 3 Soak it in the solution for 48 hours, centrifuge...

Embodiment 2

[0019] Embodiment 2: (PW 12 o 40 / TH) 5 Photocatalytic Activity Test of Composite Thin Film Modified Semiconducting Metal Oxide Catalysts under Solar Light

[0020] Photocatalytic experiment: The model organic dye molecules are methyl orange (MO) and rhodamine (RhB).

[0021] Take 5ml MO (10mg / L) or RhB (5mg / L) solution in the quartz test tube, 20mg (PW 12 o 40 / TH) 5 The semiconducting metal oxide catalyst modified by the composite film, after shaking and mixing evenly, placed in the dark to achieve the balance of adsorption and desorption, placed under the sun for solar light experiment, the solar radiation intensity is 3.8J / cm 2 .min, with an average temperature of 18°C.

[0022] Evaluation of photocatalytic activity: Put the photocatalyst sample into 5ml of 10mg / L methyl orange solution, irradiate it under sunlight for a certain period of time, and centrifuge to separate the methyl orange solution. Changes in the absorption spectrum during the process, measured the ...

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Abstract

The invention relates to a preparation method and application of a semiconductor metallic oxide photocatalyst. The photocatalyst is characterized in that an XW12-TH composite film is self-assembled on a semiconductor metallic oxide by adopting a layer-by-layer self-assembly method by taking polyoxometallate negative ions XW12O40n-(X=B,Si,P,Ge) as inorganic negative ion and thionine as organic positive ion. The photocatalyst has very good photocatalysis performance on the molecules of methyl orange dyes, rhodamine dyes and the like by utilizing sun light and has the potential application prospect in the aspects of environmental protection and energy saving.

Description

technical field [0001] The invention relates to a photocatalyst for self-assembling a polyoxometalate-thionine composite thin film on a semiconductor metal oxide, in particular to a metal oxide catalyst with high photocatalytic activity in the visible light range. Background technique [0002] With the rapid development of economy, society and various technologies, people are more and more concerned about environmental issues that affect human life and survival, and are currently facing serious energy shortages and environmental pollution problems, such as toxic and refractory organic pollutants (such as halogen Substances, dioxins, pesticides, dyes, etc.) have become a major issue affecting human survival and health in the 21st century. It is difficult to deal with these pollutants with existing environmental technologies. In recent years, the developed photocatalytic technology using semiconductor metal oxides as catalysts provides us with an ideal method for energy utiliz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/16B01J31/18B01J31/02B01J21/06B01J23/30B01J37/00A62D3/17A62D101/28A62D101/26A62D101/20
Inventor 高水英曹荣
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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