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Lanthanum cobaltate/attapulgite/reduced graphene oxide nano-structure composite material, preparation method, and application thereof

A technology of composite materials and nanostructures, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, separation methods, etc., can solve problems that restrict the application prospects of photo-SCR, and achieve favorable catalytic activity , Improve the catalytic active site, good composite effect

Active Publication Date: 2017-09-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japan Tanaka research group on TiO 2 A series of optical coupling-SCR denitrification studies have been carried out, but due to TiO 2 It has a wide bandgap (3.2eV) and only responds to ultraviolet light, but almost no response to visible light, thus restricting the application prospects of photo-SCR
[0004] Therefore, it is of great practical value to use cheap and abundant non-noble metals to directly design catalytic materials with good visible light response to realize the photocoupled-SCR low-temperature reduction of nitrogen oxides, and there are few reports on this aspect.

Method used

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  • Lanthanum cobaltate/attapulgite/reduced graphene oxide nano-structure composite material, preparation method, and application thereof
  • Lanthanum cobaltate/attapulgite/reduced graphene oxide nano-structure composite material, preparation method, and application thereof
  • Lanthanum cobaltate/attapulgite/reduced graphene oxide nano-structure composite material, preparation method, and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 0.39g of lanthanum nitrate, 0.35g of cobalt nitrate, 0.48g of citric acid, and 1.0g of attapulgite into 100ml of deionized water and stir, then transfer to an 80°C water bath to evaporate to obtain a wet gel, dry at 80°C, and ℃ calcining (heating rate 2°C / min) for 2 hours, drying and grinding to obtain lanthanum cobaltate / attapulgite, then add 1g of the obtained lanthanum cobaltate / attapulgite to 50mL deionized water, add hydrochloric acid to adjust the pH to 3. The positively charged lanthanum cobaltate / attapulgite aqueous dispersion is obtained;

[0028] (2) After the graphite oxide prepared by the Hummers method is ultrasonically dispersed in deionized water, hydrazine hydrate is added dropwise and reduced in a water bath at 90° C., washed and filtered, and then dried to obtain negatively charged reduced graphene oxide;

[0029] (3) The negatively charged reduced graphene oxide 0.006g obtained in step (2) is ultrasonically dispersed in 50mL deionized water, a...

Embodiment 2

[0033] (1) with embodiment 1;

[0034] (2) with embodiment 1;

[0035] (3) The negatively charged reduced graphene oxide 0.004g obtained in step (2) is ultrasonically dispersed in 50mL deionized water, and the positively charged lanthanum cobaltate / attapulgite water obtained in step (1) is added Dispersion liquid, stirred in 80°C water bath, dried, and ground to obtain 0.4% LaCoO 3 / ATP / rGO nanostructured composites.

Embodiment 3

[0037] (1) with embodiment 1;

[0038] (2) with embodiment 1;

[0039] (3) The negatively charged reduced graphene oxide 0.005g obtained in step (2) is ultrasonically dispersed in 50mL deionized water, and the positively charged lanthanum cobaltate / attapulgite water obtained in step (1) is added Dispersion, stirred in 80°C water bath, dried, and ground to obtain 0.5% LaCoO 3 / ATP / rGO nanostructured composites.

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Abstract

The invention belongs to the field of novel chemical materials and especially relates to a lanthanum cobaltate / attapulgite / reduced graphene oxide nano-structure composite material, a preparation method, and an application thereof. The preparation method includes the steps of: 1) preparing lanthanum cobaltate / attapulgite through a sol-gel process, adding the lanthanum cobaltate / attapulgite to deionized water and acidifying the liquid and regulating pH value to obtain a lanthanum cobaltate / attapulgite water solution carrying positive charges; 2) reducing graphite oxide with hydrazine hydrate to produce reduced graphene oxide carrying negative charges, and mixing the reduced graphene oxide with the lanthanum cobaltate / attapulgite water solution, stirring the mixture in water bath, performing a reaction, and drying a reaction product to obtain a perovskite / attapulgite / reduced graphene oxide composite material. With the composite material as a catalyst for performing photo-SCR denitration, conversion rate on NOx in a low-temperature zone (100-200 DEG C) can reach more than 95%.

Description

technical field [0001] The invention belongs to the field of new chemical materials, in particular to a lanthanum cobaltate / attapulgite / reduced graphene oxide nanostructure composite material and its preparation method and application. Background technique [0002] In recent years, humans have used fossil fuels extensively, producing a large amount of untreated nitrogen oxides, which threaten the ecosystem and human health, such as ozone layer depletion, photochemical pollution, respiratory diseases, etc. Therefore, the control of nitrogen oxides has changed is particularly important. [0003] Taking semiconductors as catalysts and using sunlight to catalyze the degradation of pollutants as a new type of denitrification technology with promising application prospects has become a hot spot in environmental protection scientific research. At present, the photocatalytic denitrification technology has attracted people's attention due to its advantages of mild reaction condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
CPCB01D53/8628B01J23/83B01J35/39
Inventor 李霞章严向玉陆晓旺姚超左士祥罗士平刘文杰
Owner CHANGZHOU UNIV
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