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Method for degrading organic pollutants in water by activating peracetic acid with nitrogen-doped carbon material

An organic pollutant, nitrogen-doped carbon technology, applied in the field of water treatment, can solve the problems of low efficiency of carbon nanotubes, difficult to separate, secondary pollution, etc., and achieve the effects of low cost, reduced treatment cost, and easy operation.

Pending Publication Date: 2020-09-01
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the external energy required for ultraviolet light activation is large, the activation of metal ions has the problem of ion leakage leading to secondary pollution, and the activation of carbon nanotubes has problems such as low efficiency and difficult separation.

Method used

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  • Method for degrading organic pollutants in water by activating peracetic acid with nitrogen-doped carbon material
  • Method for degrading organic pollutants in water by activating peracetic acid with nitrogen-doped carbon material
  • Method for degrading organic pollutants in water by activating peracetic acid with nitrogen-doped carbon material

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preparation example Construction

[0036] In the present invention, the preparation method of the carbonized polyaniline preferably comprises the following steps:

[0037] mixing aniline, hydrochloric acid aqueous solution and ammonium persulfate aqueous solution to carry out polymerization reaction to obtain polyaniline;

[0038] Under a protective atmosphere, the polyaniline is carbonized and then cooled to obtain carbonized polyaniline.

[0039] In the present invention, it is preferred to mix aniline, hydrochloric acid aqueous solution and ammonium persulfate aqueous solution to carry out polymerization reaction to obtain polyaniline. In the present invention, the purity of the aniline is preferably ≥99.5%, and the aniline is preferably commercially available analytically pure aniline (with a concentration of 0.018 mol / L). In the present invention, the molar concentration of the hydrochloric acid aqueous solution is preferably 90-540 mmol / L, more preferably 150-450 mmol / L, and even more preferably 200-300 ...

Embodiment 1

[0072] According to the molar ratio of aniline and hydrochloric acid 1:2, 1.6mL of aniline (0.018mol, analytically pure, purity ≥ 99.5%) was dissolved in 100mL of 360mM hydrochloric acid aqueous solution and stirred for 0.5h as a monomer solution, and the obtained monomer solution was placed at 0°C In the following ice bath, add 100mL ammonium persulfate aqueous solution (180mM) according to the molar ratio of ammonium persulfate and aniline 1:1, and carry out the polymerization reaction for 4h; Wash the filter cake alternately with ultrapure water until the filtered solution is colorless; collect the solid and dry it in a vacuum oven at 60°C for 24 hours to obtain polyaniline;

[0073] The polyaniline was placed in a tube furnace, heated to 900°C at a rate of 5°C / min under a nitrogen atmosphere, carbonized for 4 hours, cooled to room temperature at a rate of 1°C / min, and ground to a particle size 350nm, to obtain carbonized polyaniline, denoted as CPANI-9, the prepared CPANI-...

Embodiment 2

[0076] Put 200 mg of graphene oxide GO in a beaker containing 100 mL of ultrapure water, ultrasonically disperse for 2 h to obtain a GO aqueous solution, add 1 g of urea to the GO solution and stir for 0.5 h, transfer the obtained beaker containing the mixed solution to a vacuum freezer In the dryer, freeze-dry for 24 hours to obtain the precursor;

[0077] The precursor was placed in a tube furnace, heated to 600 °C at a rate of 5 °C / min under a nitrogen atmosphere, carbonized for 4 h, cooled to room temperature at a rate of 1 °C / min, the sample was taken out and ground and Collect after sieving (200 mesh) to obtain nitrogen-doped graphene, denoted as NG, the nitrogen doping amount of prepared NG is 11.39%, and the particle diameter is 400nm;

[0078] The phenol aqueous solution of 1mg / L is joined in the 100mL beaker, stir under the condition of 500rpm, add peracetic acid solution (mass fraction is 15%), adjust pH value to 7 with NaOH solution (mass concentration is 20g / L), o...

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Abstract

The invention relates to the technical field of water treatment, in particular to a method for degrading organic pollutants in water by activating peracetic acid with a nitrogen-doped carbon material.The method comprises the following steps: adding a peroxyacetic acid solution into a to-be-treated organic pollutant aqueous solution, and adjusting the pH value to 6.5-7.5 to obtain a mixed solution; and adding a nitrogen-doped carbon material into the mixed solution, and carrying out degradation treatment on the obtained reaction solution. According to the method, nitrogen atoms with relativelyhigh electronegativity are doped in the nitrogen-doped carbon material, so that the nitrogen-doped carbon material has relatively strong adsorption and catalytic properties; and pyridine nitrogen, graphite nitrogen, pyrrole nitrogen atoms, crystal form defects and the like on the surface of the nitrogen-doped carbon material are used as active sites to be combined with peracetic acid, so that peracetic acid can be decomposed to generate singlet oxygen, hydroxyl free radicals and organic carbon free radicals to quickly oxidize pollutants, and the organic pollutants are removed through oxidation.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for activating peracetic acid to degrade organic pollutants in water by using nitrogen-doped carbon materials. Background technique [0002] With the acceleration of urbanization and industrialization, a large number of toxic and harmful synthetic organic substances, such as dyes, phenolic substances, antibiotics and personal care products, etc., have entered the urban water cycle process, on the one hand, it has brought huge ecological damage to the natural water ecological environment. On the other hand, it also brings hidden dangers to the reuse of industrial wastewater and urban sewage. For the removal of these organic pollutants, advanced oxidation technology has great advantages. The advanced oxidation method based on the activation of peracetic acid is a research focus in recent years and has a good application prospect. [0003] Peracetic acid is activa...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/28B01J20/20B01J20/30B01J27/24C02F101/30
CPCC02F1/725C02F1/283B01J20/20B01J27/24C02F2305/023C02F2101/30
Inventor 刘永泽田幸张立秋江进封莉刘世奇杜子文
Owner BEIJING FORESTRY UNIVERSITY
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