Carbon encapsulation defect iron nano-catalyst, preparation method thereof and application of carbon encapsulation defect iron nano-catalyst in catalyzing peroxymonosulfate to degrade emerging pollutants

An iron nanometer and carbon encapsulation technology, which is applied in the direction of catalyst activation/preparation, water pollutants, chemical instruments and methods, etc., can solve the problems of metal-organic framework material structure instability, large pH value influence, low activation efficiency, etc., to achieve Easy to recycle, enhance effect, remove effect with good effect

Inactive Publication Date: 2020-04-03
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a carbon-encapsulated defective iron nanometer for the problems that the metal-organic framework material structure is unstable and easy to collapse, the traditional catalyst has low activation efficiency in the activated PMS system, is greatly affected by the pH value, and easily causes secondary pollution. Catalyst and its preparation method and its application to catalyze the degradation of emerging pollutants by biperoxysulfate

Method used

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  • Carbon encapsulation defect iron nano-catalyst, preparation method thereof and application of carbon encapsulation defect iron nano-catalyst in catalyzing peroxymonosulfate to degrade emerging pollutants
  • Carbon encapsulation defect iron nano-catalyst, preparation method thereof and application of carbon encapsulation defect iron nano-catalyst in catalyzing peroxymonosulfate to degrade emerging pollutants
  • Carbon encapsulation defect iron nano-catalyst, preparation method thereof and application of carbon encapsulation defect iron nano-catalyst in catalyzing peroxymonosulfate to degrade emerging pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example investigates the effect of adsorbing four kinds of ECs on carbon-encapsulated defect iron nanomaterials (C-Fe) prepared under different pyrolysis conditions.

[0040] (1) Preparation of carbon-encapsulated defect iron nanomaterials (C-Fe): take terephthalic acid (1.065g) and FeCl respectively 2 4H 2 O (2.65g) was placed in a 500ml there-necked flask, and 250ml of N,N-dimethylformamide was added to dissolve it, 30ml of methanol was added again, and 8ml of hydrofluoric acid was added dropwise to make the solution light green, and then heated to 140°C, reacted for 24h, and obtained the ferrous MOFs precursor. Then, the ferrous MOFs precursor was pyrolyzed at a high temperature in a tube furnace, and five black solid powders were obtained by pyrolysis under the following five pyrolysis conditions (pyrolysis temperature and time): 500°C & 2h, 650°C & 2h, 800°C & 2h, 650°C & 1h and 650°C & 3h; transfer these 5 kinds of black solid powders to 5 centrifuge tubes ...

Embodiment 2

[0048] This example investigates the effect of carbon-encapsulated defect iron nanomaterials (C-Fe) prepared under different pyrolysis conditions to activate PMS to degrade four kinds of ECs.

[0049] (1) The preparation method of the carbon-encapsulated defective iron nanomaterial (C-Fe) is the same as the step (1) in Example 1;

[0050] (2) Prepare concentration of 0.036mmol L respectively -1 Tetrabromobisphenol A solution, sulfamethoxazole solution, trichlorophenol solution and ciprofloxacin solution were used as ECs pollutants (0.036mmol L -1 ),spare;

[0051] (3) Using Erlenmeyer flasks as reactors, add 100 mL of the above four ECs pollutants to the four reactors (both concentrations are 0.036 mmol L -1 ), and then add 100mL of PMS solution (concentration of 0.36 mmolL -1 ), add 0.01g of C-Fe-1 to the 4 reactors respectively, place the 4 reactors in a 180rpm shaker, and carry out the degradation reaction at normal temperature (25°C); then test under the same conditions...

Embodiment 3

[0056] This example examines the effect of different molar ratios of PMS and tetrabromobisphenol A (n PMS / n ECs=1, 2, 3, 4, 5:1) on the catalytic activation of carbon-encapsulated defect iron nanomaterials (C-Fe) influences.

[0057] (1) Preparation of carbon-encapsulated defect iron nanomaterials (C-Fe): take terephthalic acid (1.065g) and FeCl respectively 2 4H 2 O (2.65g) was placed in a 500ml three-necked flask, and 250ml of N,N-dimethylformamide was added to dissolve it, then 30ml of methanol was added, and 8ml of hydrofluoric acid was added dropwise to make the solution light green, then heated to 140°C for 24h to obtain the ferrous MOFs precursor. Then, the ferrous MOFs precursor was subjected to high-temperature pyrolysis in a tube furnace, the pyrolysis temperature was 650° C., and the pyrolysis time was 2 hours to obtain a black solid powder. The black solid powder is transferred to a centrifuge tube, and the black solid powder is dissolved in 0.1mol L -1 Wash wi...

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Abstract

The invention discloses a carbon encapsulation defect iron nano-catalyst, a preparation method thereof and application of the carbon encapsulation defect iron nano-catalyst in catalyzing peroxymonosulfate to degrade emerging pollutants. The preparation method comprises the following steps of synthesizing a ferrous metal organic framework material as a precursor by a hydrothermal method; pyrolyzingthe precursor at a high temperature in a nitrogen atmosphere to obtain black solid powder; and stirring and washing the black solid powder in dilute sulfuric acid, centrifuging, washing with methanol, centrifuging, and drying to obtain a carbon encapsulation defect iron nano material. According to the method, a method for pyrolyzing the iron-based metal organic framework material is utilized, andstable C-Fe is generated under the condition that Fe-based defect sites are reserved to the maximum extent. Under the condition of normal temperature, C-Fe can adsorb, catalyze and activate PMS to efficiently degrade various emerging pollutants (ECs). The catalyst is easy to recycle, still has a good activation effect after being repeatedly used for multiple times, is an environment-friendly material, and has a great application prospect in the aspect of degrading the emerging pollutants.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a carbon-encapsulated defective iron nano-catalyst and a preparation method thereof and the application thereof to catalyze the degradation of emerging pollutants by hydrogen persulfate. Background technique [0002] With the widespread use of pesticides, antibiotics and cosmetics, the concentration of emerging pollutants (ECs) in surface water has increased from ngL -1 rise to μg L -1 , some even rise to mg L -1 , thus posing a huge threat to the aquatic environment. Furthermore, conventional water treatment processes cannot effectively remove ECs from wastewater due to their stable chemical structure and bioaccumulation properties. Therefore, the effective removal of ECs from wastewater has become a research hotspot in the environmental field. [0003] In recent years, sulfate (SO 4 -· ) advanced oxidation process (AOPS) has received extensive ...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/10B01J37/08B01J35/10C02F1/72C02F101/30
CPCB01J23/745B01J37/10B01J37/086C02F1/725C02F1/72C02F2101/30C02F2305/02B01J35/60
Inventor 万金泉池海远马邕文王艳黄梅刘亚鑫
Owner SOUTH CHINA UNIV OF TECH
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