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Advanced redox water treatment technology based on nitrogen-doped iron-carbon material with core-shell structure and for magnetic field recovery

A core-shell structure, advanced oxidation technology, applied in the fields of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as high energy demand, toxic metal leakage, etc., to overcome easy agglomeration and prolong use. The effect of longevity, simple method

Active Publication Date: 2018-12-07
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods for activating persulfate and hydrogen peroxide include ultraviolet light, heat, or transition metals and their oxides, but these activation methods have high energy requirements and the leakage of toxic metals during the process limits the popularization and application of these technologies

Method used

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  • Advanced redox water treatment technology based on nitrogen-doped iron-carbon material with core-shell structure and for magnetic field recovery
  • Advanced redox water treatment technology based on nitrogen-doped iron-carbon material with core-shell structure and for magnetic field recovery
  • Advanced redox water treatment technology based on nitrogen-doped iron-carbon material with core-shell structure and for magnetic field recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0020] Example 1 Preparation of a nitrogen-doped iron-carbon composite material with a magnetic core-shell structure

[0021] 674mg of FeCl 3 ·6H 2 O, 452.5 mg of 2-aminoterephthalic acid (NH 2 DBC), 56mL of N,N-dimethylformamide (DMF) was added to the container, and stirred at room temperature to a transparent solution; the solution was transferred to a polytetrafluoroethylene reactor liner with a volume of 100mL. After the shell is sealed, put it in an oven and keep it at 443K for 24 hours; after slowly cooling to room temperature, the mixture is centrifuged, and the obtained crystals are washed with DMF and absolute ethanol respectively; the washed crystals are placed in a vacuum oven at 100°C to keep warm 10 hours. The dried crystals were calcined in a tube furnace in a nitrogen atmosphere, raised to 650°C at a rate of 5°C / min, kept for 3 hours, and cooled naturally to room temperature to obtain a nitrogen-doped crystal with a magnetic core-shell structure. Iron carbon...

Embodiment example 2

[0022] Implementation Case 2 A nitrogen-doped iron-carbon composite material with a magnetic core-shell structure activates persulfate to degrade acyclovir drug pollutants in water

[0023] The nitrogen-doped iron-carbon composite material with a magnetic core-shell structure prepared in Example 1 was used as a catalyst to activate persulfate to degrade acyclovir refractory drug pollutants in water. A 250mL beaker was used as a reactor, 200mL of reaction solution was configured, and the pH of the solution was adjusted to 7.0 with 0.1mol / L NaOH. Wherein, the dosage of catalyst is 100 mg / L, the concentration of potassium persulfate is 0.65 mmol / L, the concentration of acyclovir is 10 mg / L, and the reaction is carried out with sufficient stirring at room temperature for 1 h.

[0024] In this embodiment, the iron-carbon composite material doped with magnetic core-shell structure and nitrogen-doped activated persulfate can effectively oxidize and degrade acyclovir in water, and the...

Embodiment example 3

[0025] Implementation Case 3 A nitrogen-doped iron-carbon composite material with a magnetic core-shell structure reduces and removes bromate in water

[0026] The nitrogen-doped iron-carbon composite material with a magnetic core-shell structure prepared in Example 1 was used as a reducing agent to remove bromate in water, and a conical flask with a capacity of 300 mL was selected as the reactor, and then bromate with a concentration of 7.81 μmol / L BrO 3 - Add the solution into the reactor, and then add 500mg / L reducing agent into the reactor. After the addition is complete, stopper the bottle tightly, then vibrate at 200rpm at room temperature, take water samples at regular intervals and filter them through a 0.45μm filter membrane before use. Quantitative Analysis of BrO by Ion Chromatography 3 - and Br - concentration, the result is as Figure 4 . Figure 4 It shows that the nitrogen-doped iron-carbon composite material with a magnetic core-shell structure of the pre...

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Abstract

The invention relates to the fields of new material science and technology and environmental protection technology and particularly discloses a preparation method of a nitrogen-doped iron-carbon material with a core-shell structure and suitable for magnetic field recovery and an application method thereof in an advanced redox water treatment technology. The nitrogen-doped iron-containing metal organic framework is a high-performance iron-carbon composite material obtained through precursor one-step carbonization. The iron element in the material is mainly fixed in the form of zero-valent ironin the porous carbon material so that a core-shell structure is formed. The nitrogen-doped carbon material shell can protect the zero-valent iron and prolong the service life of the iron-carbon composite material. The iron-carbon composite material has the catalytic oxidation ability of an activated peroxide oxidant, can be applied to the advanced oxidation system, has good interface reducing ability of zero-valent iron and realizes efficient removal of multiple pollutants in the water.

Description

technical field [0001] The invention relates to a preparation method of a magnetic nitrogen-doped iron-carbon composite material with a core-shell structure that can be recovered by a magnetic field, and belongs to the field of new material science and technology; A polluted water treatment method belongs to the technical field of environmental protection. Background technique [0002] Porous carbon materials have structural properties such as high specific surface area, excellent chemical stability, and adjustable pore size. Therefore, it has a wide range of applications in the fields of adsorption, catalysis and separation. In recent years, active nitrogen elements have been incorporated into the graphite structure of porous carbon to increase the activity of free electrons in the porous carbon material structure, which can further enhance the catalytic activity of porous carbon materials in catalytic reactions. Nitrogen-doped porous carbon has more superior properties t...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/72C02F101/22C02F101/12C02F101/16
CPCC02F1/725B01J27/24C02F2101/12C02F2101/163C02F2101/22B01J35/396B01J35/33
Inventor 齐飞刘超柳力元田幸
Owner BEIJING FORESTRY UNIVERSITY
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