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Preparation method and application of a cerium-silver-attapulgite z-type heterojunction catalyst

A kind of technology of attapulgite and cerium ferrite

Active Publication Date: 2021-05-07
JIANGSU HUAYUAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common TiO 2 The semiconductor band gap is wide, and the denitrification performance and sulfur resistance performance of the catalyst at low temperature are poor. Cerium ferrite (CeFeO 3 ) is a perovskite (ABO 3 ) structure of rare earth composite metal oxide, which has a narrow band gap (1.8eV), good sulfur resistance, and has good development prospects in the fields of environmental protection, industrial catalysis, etc. However, a single perovskite Nanoparticles are large in size and easy to agglomerate

Method used

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  • Preparation method and application of a cerium-silver-attapulgite z-type heterojunction catalyst
  • Preparation method and application of a cerium-silver-attapulgite z-type heterojunction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021](1) Weigh 0.8892 g of cerium nitrate, 0.8275 g of iron nitrate, 0.0348 g of silver nitrate, 1.0590 g of citric acid dissolved in 100 mL of deionized water, add 2 ml of ethylene glycol, and sodium hydroxide solution. The pH is adjusted to 8, and the mixed solution was placed in a 70 ° C water bath and stirred for 10 h, and the american precursor-silver mixture was obtained; wherein the nitrate is a cerium nitrate (III) hexahydrate, the Iron nitrate is cerium nitrate (III) nine hydrate;

[0022](2) 60 ° C apolorite was stirred in hydrochloric acid for 3 h, and then washed multiple times using distilled water until the wash is stopped at 3.0, and then dried at 80 ° C, then grinding sieves. Acidified concave rod;

[0023](3) Weigh 0.8892 g acidified concave-resistant stone added to a ferrous precursor-silver mixing system, continued to stir for 16 h, evaporate to obtain a wet gel, and then put the wet gel in a dry box, dry To form a dry gel, place the dry gel in the muffle furnace, warm...

Embodiment 2

[0025](1) Weigh 0.8892 g of cerium nitrate, 2.4825 g of iron nitrate, 0.1741 g of silver nitrate, 3.1528 g of citric acid dissolved in 100 mL of deionized water, add 4 mL of ethylene glycol, sodium hydroxide solution. Adjust its pH to 10, place the mixed solution in a water bath of 80 ° C for 13 h, resulting in a mixing system;

[0026](2) 70 ° C apolorite was stirred in hydrochloric acid for 4 h, then washed multiple times using distilled water until the wash was stopped at 5.0, and then dried at 90 ° C, then grinding sieve, Acidified concave rod;

[0027](3) Weigh 2.6676 g of acidified concave-resistant stone addition to the mixing system, continued for 20 h, evaporate to obtain a wet gel, and then put the wet gel in a drying tank, dry and form a dry gel, will dry The gel is placed in a muffle, warming up at a temperature rise rate of 2 ° C / min to 700 ° C, and calcined 2 h, and finally ground bartender-silver-concave stone nanoz-type heterojunction catalyst.

Embodiment 3

[0029](1) Weigh 0.8892 g of cerium nitrate, 4.1375 g of iron nitrate, 0.3480 g of silver nitrate, 5.2547 g of citric acid dissolved in 100 mL of deionized water, add 6 mL of ethylene glycol, and sodium hydroxide solution. The pH is adjusted to 12, and the mixed solution is placed in a 90 ° C water bath to stir for 16 h, and the mixing system is obtained;

[0030](2) EtOAc EtOAc EtOAc Solids 5 h in hydrochloric acid at 80 ° C, and then washed multiple times with distilled water until the washing liquid is 7.0 when the washing is 7.0, and then dried at 100 ° C, then grinds the sieves. Acidified concave rod;

[0031](3) Weigh 4.5000 g of acidified concave rods to the mixing system, continued to stir 24 h, evaporate to obtain a wet gel, and then put the wet gel in a drying tank, dry and form a dry gel, will dry The gel is placed in a muffle furnace, and the temperature is calcined at a temperature of 2 ° C / min, and the heat is calcined for 2 h, and finally ground bartender-silver-concave st...

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Abstract

The invention discloses a preparation method and application of a cerium ferrite-silver-attapulgite Z-type heterojunction catalyst, and belongs to the field of catalysts. In the invention, cerium nitrate, iron nitrate, silver nitrate and citric acid are first weighed and added to Stir in deionized water, add ethylene glycol dropwise, adjust the pH value to 8-12 with sodium hydroxide, and then stir under heating in a water bath to obtain a mixed system, add the acidified attapulgite into the mixed system, After stirring and volatilizing into a wet gel, then drying into a dry gel, and finally calcining at a high temperature and grinding to obtain a cerium ferrite-silver-attapulgite composite material. The present invention adopts a one-step sol-gel method to prepare cerium-silver ferrite-silver The attapulgite nanostructured composite material, silver as an electron mediator, can construct a Z-type catalyst cerium ferrite-silver-attapulgite, inhibit the recombination of photogenerated electron-holes, and can improve the catalytic performance of the composite material, and Ce ions increase The denitration and anti-sulfur activity of the catalyst was improved.

Description

Technical field[0001]The present invention belongs to the field of catalyst involves the preparation method of ferrous-silver-concavestone Z-shaped heterojunction catalysts and its optocoupled denitrifination applications.Background technique[0002]In recent years, with the rapid development of the modern industrialization process, the large number of fossil fuels have caused the pollution of nitrogen oxides, which seriously threatens the ecological environment and human health, such as photochemical smoke, acid rain, solid particulate matter PM2. 5 and respiratory diseases, etc., and thus, the governance of nitrogen oxides is particularly urgent.[0003]Using semiconductor special band structure produces electronic hole driving under solar light to generate an electronic hole driving oxidation-reduction reaction with a new type of pollutant as a new type, and has a potential low-temperature high-efficiency photocatalytic denitration technology to become a hot spot in environmental pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/56
CPCB01D53/8628B01J23/894B01J35/39
Inventor 姚超夏建文李霞章左士祥严向玉刘文杰夏青
Owner JIANGSU HUAYUAN MINING
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