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Preparing Nano Ag/CeO2 catalyst possessing catalytic activity of visible light

A catalytic activity, visible light technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problem of high investment in degradation equipment and degradation operation cost

Inactive Publication Date: 2009-01-14
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the energy of ultraviolet radiation in sunlight is low, accounting for only 4% to 6% of the total illuminance. If semiconductor photocatalysts that rely on ultraviolet light are used to degrade organic pollutants, the investment in degradation equipment and the cost of degradation operation will be high.

Method used

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  • Preparing Nano Ag/CeO2 catalyst possessing catalytic activity of visible light
  • Preparing Nano Ag/CeO2 catalyst possessing catalytic activity of visible light
  • Preparing Nano Ag/CeO2 catalyst possessing catalytic activity of visible light

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A method of the present invention to prepare nano-Ag / CeO with visible light catalytic activity 2 The method of catalyst, its technique comprises following two parts:

[0018] (A) From Ce(NO 3 ) 3 ·6H 2 O to prepare CeO 2 Hydrosol part;

[0019] (B) with the above CeO 2 Preparation of Ag / CeO from Hydrosol as Feed Liquid 2 Catalyst part.

[0020] From Ce(NO 3 ) 3 ·6H 2 O to prepare CeO 2 For the hydrosol part, the process steps are as follows:

[0021] (A-1) with Ce(NO 3 ) 3 ·6H 2 O is the raw material, using the two-step precipitation method (see Document 3, B.Djuricic, S.Pickering.Nanostructured Cerium oxide preparation and properties of weakly-agglomerated powders.J.ofMater.Sci..34(1999), 1911~1919) Preparation of CeO 2 , namely: to Ce(NO 3 ) 3 Add H to the solution 2o 2 , and then dripped dilute ammonia water to obtain an orange precipitate, which was separated and washed to obtain CeO 2 precipitation;

[0022] (A-2) the gained CeO 2 Suspend in ...

Embodiment 2

[0042] A method of the present invention to prepare nano-Ag / CeO with visible light catalytic activity 2 The method of catalyzer, its material liquid and processing step are similar to embodiment 1, but in step (B-1) use hexamethylenetetramine instead as precipitant, in step (B-2) adopt simple impregnation method to prepare Ag / CeO 2 Sample, namely the hydrated cerium oxide product 5.80g (CeO 2 content is 58.3%) adding AgNO with a concentration of 0.05mol / L 3 In 10ml of the solution, after stirring for 1 hour in the dark, dry it in an oven at 110°C, and bake it in a muffle furnace at 500°C for 3 hours to obtain Ag / CeO with a silver content of 1.6%. 2 Sample 4#.

[0043] The sample 4# was used to degrade the dye methylene blue under sunlight irradiation, the degradation conditions were the same as in Example 1, and the degradation rate was 46.4% in 3 hours.

Embodiment 3

[0045] A method of the present invention to prepare nano-Ag / CeO with visible light catalytic activity 2 The method of catalyst, with the aqueous solution of mixed rare earth chloride containing cerium (III) and non-cerium rare earth as starting material, in the mixed rare earth chloride solution that mixed rare earth oxide content is 100 g / liter, add equivalent rare earth oxide Ammonia water of 1.2 times of the total amount (denoted as TREO) is used to precipitate mixed rare earth chlorides as mixed hydroxides, and then add hydrogen peroxide equivalent to 0.37TREO to oxidize cerium (III) in mixed rare earth hydroxides to cerium (IV) , and then heat the resulting reddish-brown suspension to turn it into yellow, then slowly add hydrochloric acid under stirring to selectively dissolve the hydroxides of non-cerium rare earths, make the suspension clear, and obtain CeO 2 Hydrosol. To the above CeO 2 Add urea equivalent to 0.08TREO into the hydrosol, and heat the system. After abo...

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Abstract

A nano-class Ag / CeO2 catalyst with the visual light catalyzing activity is prepared from CeO2 hydrosol through adding the precipitant which can gradually release OH when its solution temp is raised while heating to destabilize said CeO2 hydrosol, educing out fine deposit of hydrated CeO2, compounding the Ag onto the surface of fine CeO2 particles, and activating by low-temp calcining.

Description

technical field [0001] The present invention relates to a kind of Ag / CeO 2 Catalysts, especially a nano-Ag / CeO with visible light catalytic activity 2 The preparation method of catalyst, the obtained target Ag / CeO 2 The catalyst can be activated by ultraviolet light and visible light, and effectively catalyzes the degradation of organic pollutants. The invention belongs to the field of inorganic nanometer photocatalytic materials. Background technique [0002] With the increasingly serious environmental problems, the application of semiconductor photocatalytic degradation technology in environmental protection has received extensive attention. At present, the most researched semiconductor photocatalytic materials are TiO 2 , ZnO, ZnS, etc. [0003] Usually CeO 2 is doped to TiO as an additive 2 and other semiconducting oxides to enhance TiO 2 The photocatalytic activity of other host oxides, rarely CeO 2 Used as the main body of semiconductor photocatalyst. The gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63C02F1/30C02F1/32
Inventor 张其春李纲叶巧明敦文杰刘菁
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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