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Preparation method of peel-off type bentonite supported silver phosphate catalyst

A technology of bentonite and silver phosphate, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of small interlayer spacing, reduced catalytic efficiency, and the catalyst surface cannot be fully utilized. Contact, promote the effect of mass transfer

Active Publication Date: 2014-04-02
无锡智慧兴宜信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the application process of bentonite-supported catalysts: for example, after bentonite loads catalysts between layers, the interlayer distance may increase somewhat, but since bentonite has a layer structure, the layers are horizontal structures, and the interlayer distance Smaller, with catalyst crystals in the middle, and interlayer bound water, which seriously affects the diffusion of pollutants to the catalyst surface, resulting in the incomplete use of the catalyst surface and reducing the catalytic efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 10 g of dry bentonite powder that has passed through a 100-mesh sieve into 50 mL of a cationic surfactant solution with an alkyl chain carbon number of 8 at a concentration of 250 mmol / L, stir for 2 hours, and let stand to form a cationic modified bentonite suspension. Turbid liquid; at 25°C, continue to stir, dissolve 3g of ammonium carbamate in 10ml of methanol, and add 2g of silver oxide, after stirring, the silver oxide gradually dissolves to form an organic complex of silver; at 25°C, the The organic complex of silver was added to the cationic modified bentonite suspension, stirred for 4 hours, precipitated and separated, and dried at 85°C; the dried product was irradiated with microwaves for 25 minutes in a 700w microwave oven; The product was added to a phosphoric acid solution with a volume of 30mL and a concentration of 20mmol / L, stirred for 4 hours, precipitated and separated, and dried at 105°C to obtain an exfoliated bentonite-supported silver phosphate c...

Embodiment 2

[0017] Add 10 g of dry bentonite powder that has passed through an 80-mesh sieve into 50 mL of a cationic surfactant solution with an alkyl chain carbon number of 6 at a concentration of 100 mmol / L, stir for 2 hours, and let stand to form a cationic modified bentonite suspension. Turbid liquid; at 20°C, continue to stir, dissolve 2g of ammonium carbamate in 10ml of methanol, and add 1g of silver oxide, after stirring, the silver oxide gradually dissolves to form an organic complex of silver; at 20°C, the The organic complex of silver was added to the cationic modified bentonite suspension, stirred for 2 hours, precipitated and separated, and dried at 60°C; the dried product was irradiated with microwaves for 15 minutes in a 700w microwave oven; The product was added to a phosphoric acid solution with a volume of 30mL and a concentration of 10mmol / L, stirred for 2 hours, precipitated and separated, and dried at 80°C to obtain an exfoliated bentonite-supported silver phosphate ca...

Embodiment 3

[0020] Add 10 g of dry bentonite powder that has passed through a 100-mesh sieve to 50 mL of a cationic surfactant solution with an alkyl chain carbon number of 8 at a concentration of 200 mmol / L, stir for 2 hours, and let stand to form a cationic modified bentonite suspension. Turbid liquid; at 25°C, continue to stir, dissolve 3g of ammonium carbamate in 10ml of methanol, and add 2g of silver oxide, after stirring, the silver oxide gradually dissolves to form an organic complex of silver; at 25°C, the The organic complex of silver was added to the cationic modified bentonite suspension, stirred for 4 hours, precipitated and separated, and dried at 75°C; the dried product was irradiated with microwaves for 20 minutes in a 700w microwave oven; The product was added to a phosphoric acid solution with a volume of 30mL and a concentration of 20mmol / L, stirred for 4 hours, precipitated and separated, and dried at 100°C to obtain an exfoliated bentonite-supported silver phosphate cat...

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Abstract

The invention discloses a preparation method of a peel-off type bentonite supported silver phosphate catalyst. The preparation method comprises the steps of adding dry bentonite powder to a cation surface active agent solution, stirring and standing to form a cation modified bentonite suspension; dissolving ammonium carbamate in methyl alcohol and adding silver oxide, stirring and gradually dissolving the silver oxide to form an organic complex of silver; adding the organic complex of silver into the cation modified bentonite suspension, stirring, performing precipitating separation and drying; putting the dried product in a microwave oven, and carrying out microwave irradiation; and adding the product irradiated by microwave to a phosphoric acid solution, stirring, performing precipitating separation and drying to obtain a peel-off type bentonite supported silver phosphate catalyst. As the bentonite is in a peel-off state, a large bentonite inner surface area becomes an external surface area; the silver phosphate supported on the surface is easily illuminated in a photo-catalytic process and easily contacted with organic matters to be processed, so that mass transfer is facilitated.

Description

technical field [0001] The invention relates to the field of new materials for environmental pollution control, in particular to the preparation of an exfoliated bentonite-loaded silver phosphate catalyst. Background technique [0002] With the development of science and technology, toxic organic pollutants from industrial and agricultural production seriously threaten the environment and human health. It is of great significance to seek a new and efficient environmental governance technology. Photocatalytic technology has become an emerging environmental treatment technology with important application prospects due to its advantages of energy saving, high efficiency, complete pollutant degradation, and no secondary pollution. In recent years, the development of new and efficient visible light photocatalysts has become an important research content in photocatalytic technology. Among them, photocatalytic materials with surface plasmon resonance effect, because of their uniqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18
Inventor 马建锋邹静李良银姚超
Owner 无锡智慧兴宜信息技术有限公司
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