Preparation method of copper single-atom carbon-based catalyst and application of degrading phenolic organic pollutants
A technology for organic pollutants and atomic carbon, applied in water pollutants, chemical instruments and methods, catalysts for physical/chemical processes, etc., to achieve the effect of increased activity and wide applicability
Active Publication Date: 2021-10-22
ZHEJIANG UNIV
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Problems solved by technology
However, there are few reports on the construction of single-atom metal catalysts for the degradation of Fenton-like systems.
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[0038] The present invention is further described in detail through the following embodiments in conjunction with the accompanying drawings.
[0039] (1) preparation method of copper single-atom carbon-based catalyst of the present invention
[0040] 1) Synthesis of copper precursor
[0041] 1.1) Add 10.48mmol of copper acetate monohydrate (Aladdin Chemical Reagent Company) into 500mL of deionized water, stir and dissolve for about 20min;
[0042] 1.2) Add 5.24 mmol of L-glutamic acid (McLean Chemical Reagent Co., Ltd.) to the above solution, stir and dissolve for about 20 minutes, and mark this mixture as liquid A;
[0043] 1.3) Prepare 450mL of deionized water and 50mL of ethanol solution (Sinopharm Chemical Reagent Company), add 5.52mL of 1,3,5-trimellitic acid (Aladdin Chemical Reagent Company) into it, stir for 15min to make it fully dissolved, this solution is marked as B solution;
[0044] 1.4) Mix liquid A and liquid B for about 10 minutes while stirring, and then s...
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Abstract
The invention discloses a preparation method of a copper single-atom carbon-based catalyst and an application for degrading phenolic organic pollutants. The method comprises: synthesis of a copper precursor and preparation of a copper single-atom carbon-based catalyst. The metal precursor of the present invention constitutes a metal-organic framework to fix copper sites through a dissolution and stirring reaction. Using dicyandiamide as a nitrogen source, copper and nitrogen are coordinated to form copper single-atom carbon-based materials through high-temperature cracking. Synchrotron radiation spectroscopy, spherical aberration-corrected electron microscopy and other methods have proved that copper presents a single-atom distribution. As the annealing temperature increases, the pore size of the catalyst becomes larger, the thickness of the material becomes thinner, and the activity increases. The experimental results show that the active mechanism produced by catalyst activation of potassium persulfate is not free radical oxidation (such as SO 4 ‑ ,·OH oxidation) or singlet oxygen mechanism, but the electron transfer reaction pathway. This reaction pathway is conducive to the selective degradation of organic pollutants and reduces the interference of the system by complex water bodies.
Description
technical field [0001] The invention relates to the field of catalysts for degrading phenolic organic pollutants, in particular to a preparation method of a copper single-atom carbon-based catalyst and its application for selectively degrading phenolic organic pollutants. Background technique [0002] The strong oxidizing substances produced by the activation of persulfate in heterogeneous systems that have emerged in recent years can effectively degrade and remove some emerging pollutants (such as bisphenol A) and refractory phenolic pollutants (such as phenol) in water. Persulfate has low price and low reaction energy barrier, and the free radical (such as SO 4 - , 2.5-3.1V) has a high oxidation potential and can quickly and non-selectively attack organic pollutants in water. However, it is precisely because of this advantage that it also has some disadvantages. For example, free radicals with high oxidation potential can easily cause oxidative damage to the catalyst, wh...
Claims
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IPC IPC(8): B01J27/24C02F1/72
CPCB01J27/24C02F1/722C02F2101/345
Inventor 王娟左四进金旭明刘维屏
Owner ZHEJIANG UNIV