Visible light response photocatalyst and application thereof

A photocatalyst and visible light technology, which is applied in the field of highly active photocatalyst, decomposing harmful chemical substances and producing hydrogen, and can solve the problems of not being able to use visible light

Inactive Publication Date: 2004-11-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although titanium dioxide has been used to decompose organic substances such as pesticides and odorous substances in water and the atmosphere, and to apply it on solid surfaces for self-cleaning, titanium dioxide can hardly utilize visible light.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the chemical formula of the present invention In 1-x m x AO 4 In , use indium, elements M and A to synthesize In 1-x m x AO 4 . Depending on the stoichiometric ratio, oxides of various compositions were synthesized by a solid-state method. This catalyst utilizes the stoichiometric ratio to adjust (1-x)mol In 2 o 3 x=(0-1), x mol NiO(x=0-1) and 1mol Ta 2 o 5(Table 1). For example, when x=0.2, In 0.8 Ni 0.2 TaO 4 Weighing In 2 o 8 3.201g, NiO 0.431g, Ta 2 o 5 6.368g. Put these raw materials into an alumina crucible, and after pre-sintering in an electric furnace at 900°C for 24 hours in air under normal pressure, repeat 3 times of calcination at 1200°C for 50 hours. After the calcination, the calcined product is ground into a powder with a size of 10 μm or less in a mortar. The chemical composition and crystal structure of the catalyst before and after the photoreaction were investigated using XRD and SEM-EDS. According to Rietveld's analysis, thi...

Embodiment 2

[0037] with RuO 2 Instead of NiOx in Example 1 as a cocatalyst. In 1-x Ni x TaO 4 Semiconductor doped with 1.0wt% RuO 2 The method is through RuCl 4 It is realized by immersion in aqueous solution, drying at 200°C for 5 hours, and calcination under oxidizing gas at 500°C for 2 hours. The results are shown in Table 1. Also at this time, it can be seen that water is completely decomposed under visible light. The embodiment of IrO2 is the same as above.

[0038] The electrodeposition method, that is, the electrolytic process, deposits Pt precious metals and Co transition metals on In 1-x Ni x TaO 4 Semiconductors are obtained as photocatalysts with microstructures. The results are similar to Table 1. It is also possible to use Pt carbon aggregated on In 1-x Ni x TaO 4 and similar semiconductors.

Embodiment 3

[0040] In order to confirm that the decomposition of organic matter can be carried out relatively efficiently under visible light, the decomposition of methanol was carried out in an aqueous solution. Use Pt (0.1wt%) as In 0.9 Ni 0.1 TaO 4 co-catalyst. 0.5 g of the photocatalyst was suspended in a mixed solution of 240 ml of pure water and 10 ml of methanol to cause a photolysis reaction. Visible light is irradiated from the outside while performing magnetic stirring using a closed-cycle catalytic reaction device. A 300W xenon lamp was used as a light source, and a container made of borosilicate glass was used as a reaction tank. The light from the light source passes through a chopper filter (wavelength>420nm) to obtain long-wavelength light, and then irradiates the sample (photocatalyst). Detection and quantification of generated hydrogen and oxygen were performed by gas chromatography. The experimental results showed that hydrogen was produced stably at a rate of 146 ...

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Abstract

The invention provides high-activity photocatalysts absorbing UV rays and visible lights in the sunlight, as well as a method of decomposing harmful chemical matters and decomposing water to prepare hydrogen by these photocatalysts, which are compound oxide semiconductors formed of In and 5A element in periodic table of elements as well as transition metallic element M and expressed by the formula In1-xMxAO4 derived from displacing part of In in oxide semiconductor InAO4, where the sum of mole numbers of In and M is equal to mole number of A, and these compound oxide semiconductors acts as photocatalysts. It uses these photocatalysts to realize decomposition of harmful chemical matters and of water to prepare hydrogen under the irradiation with the sunlight containing UV rays and visible lights.

Description

1. Technical field: [0001] The invention relates to photocatalysts responsive to ultraviolet and visible light and their applications, in particular to highly active photocatalysts composed of indium compound oxide semiconductors that can efficiently absorb ultraviolet and visible light in sunlight, and to use it to decompose harmful chemicals Matter and applications for making hydrogen. 2. Technical background [0002] At present, due to the constraints of fossil resources and the profound environmental and energy problems caused by their massive consumption, such as global warming and environmental degradation, etc., which directly affect the survival of human beings and the improvement of quality of life, human beings urgently need to develop green, safe and of new energy. As a source of new energy, although nuclear power generation has been put into use, there have been problems in safety and waste disposal. [0003] One of the ways to solve the problem is to use solar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/08B01J23/825
Inventor 邹志刚陈延峰叶金花
Owner NANJING UNIV
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