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Preparation method of novel carbon-based material loaded transition metal monatomic catalyst

A carbon-based material, transition metal technology, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of enriching methods, improving activation efficiency, and improving loading and stability

Inactive Publication Date: 2021-06-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the advantages of high catalytic atom utilization and high catalytic selectivity of single-atom catalysts in traditional chemical reactions such as CO oxidation have gradually emerged, but there are still challenges in improving single-atom loading and avoiding clusters during synthesis. challenge

Method used

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  • Preparation method of novel carbon-based material loaded transition metal monatomic catalyst
  • Preparation method of novel carbon-based material loaded transition metal monatomic catalyst
  • Preparation method of novel carbon-based material loaded transition metal monatomic catalyst

Examples

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Effect test

Embodiment 1

[0036] Example 1: Preparation of a new carbon-based material-supported manganese single-atom catalyst 20%Mn-NC-Ⅲ

[0037] 1) 2.3799g Zn(NO 3 ) 2 ·6H 2 O and 0.5362g (CH 3 COO)3Mn·2H 2 O was dissolved in DMF solution to form solution A.

[0038] 2) Dissolve 1.3136g of 2-methylimidazole in DMF solution to form solution B.

[0039] 3) Mix solution A in 1) and solution B in 2), and keep warm at 120° C. for 24 hours.

[0040]4) After the suspension in 3) was cooled at room temperature, it was collected by centrifugation at 8000 rpm, washed 3 times with ethanol (10000 rpm, 12000 rpm, 14000 r / min), and vacuum-dried at 60°C for 5 hours to obtain the precursor 20% Mn-ZIF -8.

[0041] 5) Mn-ZIF-8 obtained in 4) in N 2 Calcined in the atmosphere, the heating rate is 5°C / min below 1000°C, the heating rate is 2°C / min above 1000°C, the constant temperature calcination temperature is 1100°C, and the constant temperature calcination time is 1h. 20% Mn-NC-I was obtained.

[0042] 6) ...

Embodiment 2

[0049] Example 2: Novel carbon 20% Mn-NC-Ⅲ catalyst activates persulfate to degrade phenolic compounds

[0050] In order to investigate the degradation effect of the new carbon 20% Mn-NC-Ⅲ catalyst on phenolic compounds, a representative phenol (Phenol) was selected as the target organic compound. Prepare 10mmol L with deionized water -1 Phenol stock solution, 30mmol L -1 Potassium persulfate (PMS) stock solution and 0.2mol L -1 Boric acid / borax buffer solution (pH 7.2); add 5mL Phenol stock solution, 5mL PMS stock solution, 12.5mL buffer solution, and 27.5mL deionized water quantitatively according to the 50mL system, where Phenol and PMS are placed separately before starting the reaction, and the reaction is adjusted separately The pH of the system is to 7.2, and the temperature of the reaction system is well controlled; 0.005g of the catalyst to be tested is added to the Phenol part of the reaction system, the PMS part is quickly poured into it and mixed, and the timing i...

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Abstract

The invention discloses a preparation method of a novel carbon-based material loaded transition metal monatomic catalyst, and relates to the field of nano material heterogeneous catalysis. The preparation method comprises the following steps: mixing a DMF solution of a zinc salt and a transition metal salt with a DMF solution of 2-methylimidazole, carrying out heat preservation and centrifugal drying to obtain an M-ZIF-8 precursor, and finally synthesizing the novel carbon-based loaded transition metal monatomic catalyst through synthesis steps of three-step calcination, acid leaching and re-dispersion adsorption. According to the invention, an efficient transition metal monatomic catalyst synthesis method is provided, and the carbon-based material loaded transition metal monatomic catalyst is successfully applied to a reaction system for activating and degrading phenolic compounds by persulfate for the first time; and by taking transition metal Mn as an example, the synthesis method is found to be capable of effectively improving the loading capacity of monatomic metal of the transition metal and efficiently activating persulfate to degrade phenolic compounds, so that a good material basis and a good modification method are provided for application of heterogeneous Fenton-like catalytic reaction in the aspect of wastewater treatment.

Description

Technical field: [0001] The invention relates to the field of catalytic materials and environmental applications, in particular to a preparation method of a novel carbon-based material-loaded transition metal single-atom catalyst and application research on efficient degradation of phenol-containing organic pollutants. Background technique: [0002] Phenolic substances, as common chemical raw materials and intermediates, have a large stock and great harm in organic wastewater pollution. They have the characteristics of persistence, bioaccumulation, and strong toxicity. They are a type of typical organic pollutants. Effective treatment of phenol-containing sewage is an urgent and arduous task in my country's water environment work. Researchers are committed to research on advanced treatment technologies for phenolic wastewater. Based on the sulfate radical (SO 4 ●- ) advanced oxidation technology has gradually attracted attention due to its advantages of high oxidation eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/72C02F101/34
CPCB01J27/24C02F1/725C02F2101/345
Inventor 祝凌燕刘宏志任家琪陈心茹蔚晓勇史依凡周冰楠
Owner NANKAI UNIV
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