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Co-PCN catalyst capable of regulating active sites as well as preparation method and application of Co-PCN catalyst

A catalyst and oxidant technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of lack of directional regulation of catalyst active sites, limiting catalytic activity of catalysts, etc., to increase the number and variety , the effect of promoting release

Active Publication Date: 2021-06-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of directional control of the catalyst active sites in the PMS system, which limits the improvement of the catalytic activity of the catalyst and has become a major obstacle for practical water treatment applications.

Method used

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  • Co-PCN catalyst capable of regulating active sites as well as preparation method and application of Co-PCN catalyst
  • Co-PCN catalyst capable of regulating active sites as well as preparation method and application of Co-PCN catalyst
  • Co-PCN catalyst capable of regulating active sites as well as preparation method and application of Co-PCN catalyst

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preparation example Construction

[0025] The invention discloses a preparation method of a Co-PCN catalyst, comprising:

[0026] (1) Cobalt nitrate hexahydrate methanol solution and 2-methylimidazole methanol solution are mixed to obtain the first mixed solution, and the first mixed solution is reacted to obtain Co-ZIF-L;

[0027] (2) Mix the dopamine solution and the Co-ZIF-L dispersion to obtain a second mixed solution, adjust the pH of the second mixed solution and react to obtain a Co-ZIF-L@PDA composite material;

[0028] (3) The Co-PCN catalyst was obtained by heat-treating the Co-ZIF-L@PDA composite.

[0029] In some embodiments of the present invention, in step (1), the concentration of cobalt nitrate hexahydrate in the first mixed liquid is 5-15g / L, such as 5g / L, 6g / L, 7g / L, 8g / L, 9g / L, 10g / L, 11g / L, 12g / L, 13g / L, 14g / L, 15g / L;

[0030] In some embodiments of the present invention, in step (1), the concentration of 2-methylimidazole in the first mixed solution is 10-25 g / L, such as 10 g / L, 11 g / L, ...

Embodiment 1

[0059] The application of the regulation and control of the active site in the Co-PCN catalyst to strengthen the PMS activation in this embodiment is carried out through the following steps:

[0060] 1. Preparation of Co-ZIF-L precursor: Cobalt nitrate hexahydrate was dissolved in 150 mL of anhydrous methanol to obtain cobalt nitrate hexahydrate methanol solution. 2-Methylimidazole was dissolved in 150 mL of anhydrous methanol to obtain 2-methylimidazole methanol solution. The 2-methylimidazole methanol solution was transferred to the methanol solution of cobalt nitrate hexahydrate to obtain 300 mL of the mixed solution, which was stirred at room temperature for 30 min and then left to stand for 12 h. Pour off the supernatant, centrifuge the suspension at a speed of 4000r / min for 5min, wash with absolute ethanol and deionized water for 3 times, then place it in a blast drying oven at 60°C for 12h to dry, and finally use Co-ZIF-L solids were ground in an agate mortar and pestl...

Embodiment 2

[0070] The application of the regulation and control of the active site in the Co-PCN catalyst to strengthen the PMS activation in this embodiment is carried out through the following steps:

[0071] 1. Preparation of Co-ZIF-L precursor: Cobalt nitrate hexahydrate was dissolved in 150 mL of anhydrous methanol to obtain cobalt nitrate hexahydrate methanol solution. 2-Methylimidazole was dissolved in 150 mL of anhydrous methanol to obtain 2-methylimidazole methanol solution. The 2-methylimidazole methanol solution was transferred to the methanol solution of cobalt nitrate hexahydrate to obtain 300 mL of the mixed solution, which was stirred at room temperature for 30 min and then left to stand for 12 h. Pour off the supernatant, centrifuge the suspension at a speed of 2000r / min for 10min, wash with absolute ethanol and deionized water for 3 times respectively, then place it in a blast drying oven at 80°C for 6h to dry, and finally use Co-ZIF-L solids were ground in an agate mor...

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Abstract

The invention discloses a Co-PCN catalyst capable of regulating and controlling active sites and a preparation method and application of the Co-PCN catalyst. The preparation method comprises the follwing steps: a cobalt nitrate hexahydrate methanol solution and a 2-methylimidazole methanol solution are mixed to obtain a first mixed solution, and subjecting the first mixed solution to reaction to obtain Co-ZIF-L; mixing a dopamine solution and the Co-ZIF-L dispersion liquid to obtain a second mixed solution, adjusting the pH of the second mixed solution, and performing reaction to obtain a Co-ZIF-L@PDA composite material; and carrying out heat treatment on the Co-ZIF-L@PDA composite material to obtain the Co-PCN catalyst. By reasonably regulating and controlling parameters in the preparation process and optimizing a crystal structure and composition, generation of active sites in the catalyst is regulated, release of active species in a PMS oxidation system is promoted, and the problem that a traditional PMS catalyst is low in activity is solved.

Description

technical field [0001] The invention belongs to the field of multifunctional water treatment and purification materials, and in particular relates to a Co-PCN catalyst whose active site can be regulated and its preparation method and application. Background technique [0002] Antibiotics are widely used and used in large quantities. The production and use links have caused a large amount of antibiotics to enter the environment directly or indirectly. The presence of antibiotics has been detected in natural water bodies in many parts of the world, posing potential hazards to the ecological environment and human health. Among many new water pollutant removal technologies, permonosulfate (PMS) oxidation has become a research hotspot in the field of water pollution control because of its strong oxidation ability, wide application range of water quality, and convenient transportation of chemicals. [0003] The active sites in the catalyst affect the formation of active species in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/72C02F101/30C02F103/34C02F101/38
CPCB01J27/24C02F1/722C02F1/725C02F2101/30C02F2103/343C02F2305/023C02F2101/38Y02W10/37
Inventor 李宁李瑞陈冠益余洋颜蓓蓓宋英今
Owner TIANJIN UNIV
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