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TiO#-[2] based photocatalyst used for organic matter natural light degradation and preparation method thereof

A technology of photocatalyst and organic matter, which is applied in the field of TiO2-based photocatalyst, can solve the problems of reducing photon conversion rate, etc., and achieve the effect of improving photocatalytic efficiency, reducing bandgap width, and expanding the range of photoresponse

Active Publication Date: 2005-03-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of a single non-metal element may destroy the charge balance of the system and lead to the generation of oxygen vacancies. During the photocatalytic reaction, oxygen vacancies become electron / hole recombination centers, reducing the photon conversion rate.

Method used

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  • TiO#-[2] based photocatalyst used for organic matter natural light degradation and preparation method thereof
  • TiO#-[2] based photocatalyst used for organic matter natural light degradation and preparation method thereof
  • TiO#-[2] based photocatalyst used for organic matter natural light degradation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 TiO of the present invention 2 Preparation of base photocatalyst

[0027] Example 1(1)

[0028] Prepare mixed solution I with 30ml butyl titanate, 50ml absolute ethanol and 5ml glacial acetic acid; dissolve 0.4g lanthanum nitrate hexahydrate in 50ml absolute ethanol to form mixed solution II; add solution II to solution I to form mixed solution III, add 2.0ml of tetrabutylammonium hydroxide solution dropwise to solution III, let it stand for 2 days, form a gel, dry at 70°C for 12 hours, grind, put it into a muffle furnace to raise the temperature, and keep it at 400°C for 1 hour to obtain TiO doped with 1.0% lanthanum and 0.6% (mol) carbon 2 base photocatalyst.

[0029] The catalyst and pure TiO 2 The UV-Vis diffuse reflectance spectrum see figure 2 ,Depend on figure 2 It can be seen that pure TiO 2 There is no activity in the visible light region greater than 400nm wavelength, and the TiO of this embodiment 2The base photocatalyst has strong absorpt...

Embodiment 2

[0034] Embodiment 2 TiO of the present invention 2 Examples of photocatalysts degrading organic matter under different light sources

[0035] La and C co-doped TiO doped with 1% (mol) La and baked at 400°C for 1 hour 2 The base photocatalyst was used to degrade 5mg / L methyl orange with indoor natural light and outdoor sunlight, and to simulate sunlight degradation of 5mg / L rhodamine B with a 300W xenon lamp as follows:

[0036] Embodiment 2(1):

[0037] Location: Nanjing, sunny weather, temperature 20~27℃

[0038] Time: 13:20~17:20 on May 6, 2004, 8:00~12:00 on May 7, 2004,

[0039] Light source: natural light entering the room through 230×210cm windows

[0040] Taking methyl orange as the target degradation product, take 400ml of 5mg / L methyl orange solution, add 0.4g of photocatalyst, put it in the room, stir to suspend the catalyst in the solution, and degrade for 8 hours, then measure the content of methyl orange It was 1.26mg / L, and the degradation rate was 74.6%. M...

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Abstract

The invention relates to titanium dioxide photocatalyst for natural light degradation of organic matter and its manufacturing method. The catalytic agent is composed with a lanthanide of the rare earth and the mixture of C element and a substratum of titanium dioxide. In the components, the mole content of lanthanide is 0.01%-5% and the C mole content is 0.01%-5%. C adulterates in the volume phase in order to replace the O of titanium dioxide; the rare earth element adulterates in the volume phase of titanium dioxide, or deposits in the surface, or the both. The catalytic agent is manufactured by the collosol and gelatinous way. The invention mixes the solution of fetrabutyl titanate, absolute alcohol and glacial acetic acid with the solution of absolute alcohol in the lanthanide nitrate. Under stirring the solution mentioned above, add the water solution of tetra butyl group ammonium hydroxide, in order to make the PH up to 4-6. Then after laying it until being the gel, make it be desiccated, abraded and roasted, so the photocatalyst can be required. The catalytic agent can be used for the natural light degradation of the organic matter, and has no impressed luminaire so that it can save energy.

Description

technical field [0001] The present invention relates to a kind of TiO used for degrading organic matter by natural light 2 Based photocatalyst and its preparation method. Background technique [0002] Today's world is facing three major problems of population, resources and environment, and water resources are an irreplaceable and important resource among all kinds of resources. Water pollution makes the already scarce water resources even more scarce. [0003] At present, a variety of wastewater treatment methods have been developed, such as physical treatment methods: precipitation, filtration, centrifugal separation, extraction, stripping, adsorption, evaporation crystallization, reverse osmosis, etc.; chemical treatment methods: neutralization, redox, ion exchange, Electroosmosis, etc.; biological treatment methods: aerobic treatment methods (such as active mud method, biological filter, etc.), anaerobic treatment methods (mainly digesters). However, most of them have...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/10B01J27/20B01J37/00
Inventor 徐南平金万勤孙红旗
Owner NANJING UNIV OF TECH
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