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Preparation method of nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst

A particle catalyst, porous carbon technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of large catalyst loss, large raw material consumption, small scope of action, etc., and achieve efficient degradation. , The process is simple, and the effect of improving activation efficiency

Inactive Publication Date: 2020-09-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe 2+ 、Cu 2+ 、Co 2+ 、Ag + , Mn 2+ 、Ce 2+ Plasma can effectively activate persulfate to degrade organic pollutants, but there are problems such as large catalyst loss, small action range, large raw material consumption, and serious secondary pollution.

Method used

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  • Preparation method of nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst
  • Preparation method of nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst
  • Preparation method of nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Preparation of new Co@NC-900 ℃ catalyst

[0027] 1) Add 3 mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in 75 mL of methanol, and magnetically stirred for 5 min to form solution A;

[0028] 2) Dissolve 12 mmol 2-methylimidazole (2-Methylimidazole) in 75 mL methanol, shake manually for 5 min, and prepare solution B;

[0029] 3) Slowly pour solution B into solution A, the solution turns from pink to deep purple, stir for 10 min, and let stand for 24 h;

[0030] 4) Pour off the supernatant in 3), collect the solid at the bottom of the beaker, centrifuge at 8000 rpm for 15 min, take the solid and add 50 mL of methanol, vortex for 5 min, centrifuge again, and repeat washing 3 times;

[0031] 5) Dry the cleaned sample at 60 °C for 12 h under vacuum to obtain the precursor ZIF-67;

[0032] 6) Weigh 0.2 g ZIF-67 in the crucible of the oxidation furnace, and calcinate it in a nitrogen atmosphere at 900 °C for 2 h to obtain Co@NC-900 °C;

[0033] 7) For catalytic materi...

Embodiment 2

[0038]Example 2: New Co@NC-900 ℃ catalyst activates persulfate to degrade phenol (Phenol)

[0039] In order to investigate the degradation efficiency of the new Co@NC-900 ℃ catalyst on phenolic substances, the representative phenol (Phenol) was selected as the target pollutant. Prepare 10 mmol / L Phenol stock solution, 50 mmol / L potassium persulfate (PMS) stock solution and 0.2 mol / L boric acid / borax buffer solution (pH 7.2) with deionized water; add 10 mLPhenol stock solution, 15 mL PMS stock solution, 25 mL buffer solution, deionized water, where Phenol and PMS were placed separately before starting the reaction, and the pH of the reaction system was adjusted to 7.2, and the temperature of the reaction system was controlled; Add 0.005g of the catalyst to be tested in the Phenol part of the system, pour the PMS part into it quickly and mix, start timing, place the reaction device (conical flask) in a constant temperature shaker, take samples at regular intervals, and pour them...

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Abstract

The invention discloses a preparation method of a nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst, and relates to the field of Fenton-like catalysis of nano materials. The preparation method comprises the following steps that: methanol and a 2-methylimidazole solution dissolved by magnetic stirring and manual oscillation are adopted as precursor solutions, are fully mixed, andare subjected to standing and reaction to generate a ZIF-67 precursor, and the precursor is calcined under the protection of nitrogen to obtain the Co@NC-900 DEG C catalyst. The nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst obtained through ZIF-67 derivation has a better phenol degrading effect than single Co particles and single nitrogen-modified porous carbon activated potassium hydrogen persulfate. Meanwhile, the electrochemical impedance of the novel Co@NC-900 DEG C catalyst is lower, and the TOC removal rate is higher. A good material basis and a good modification method are provided for the application of heterogeneous sulfuric acid free radical heterogeneous catalysis in the aspect of water treatment.

Description

technical field [0001] The invention relates to the field of nano-catalysis materials and environmental applications, in particular to a preparation method of a nitrogen-modified porous carbon-coated cobalt nanoparticle catalyst and application research on highly efficient degradation of phenolic compounds. Background technique [0002] Phenolic compounds are a typical class of organic pollutants. Traditional physical methods (such as activated carbon adsorption, membrane separation, etc.) and chemical methods (such as coagulation-flocculation, adding oxidizing and reducing agents, etc.) cannot completely mineralize and decompose them. Advanced Oxidation Processes (AOPs) is a more advantageous technology with high oxidation efficiency, fast reaction rate, mild reaction conditions, process controllable and non-selective. [0003] In recent years, based on the sulfate radical (SO 4 − ) advanced oxidation technology (Sulfate Radical−Advanced Oxidation Processes, SR−AOPs) grad...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/72C02F101/34
CPCB01J27/24C02F1/725C02F2101/345
Inventor 祝凌燕蔚晓勇
Owner NANKAI UNIV
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