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Method for degrading perfluorocarboxylic acid pollutant by utilizing microwave radiation

A microwave radiation method, microwave radiation technology, applied in the direction of water pollutants, chemical instruments and methods, light water/sewage treatment, etc., can solve the problem of microwave radiation removal of perfluorocarboxylic acid pollutants that has not yet been seen, and the method is simple , no secondary pollution, short reaction half-life

Inactive Publication Date: 2014-07-23
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microwave radiation has been used to treat a variety of organic wastewater, especially dye wastewater, due to its advantages of high degradation efficiency, short reaction time and no secondary pollution. However, there is no public report on the removal of perfluorocarboxylic acid pollutants by microwave radiation.

Method used

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  • Method for degrading perfluorocarboxylic acid pollutant by utilizing microwave radiation
  • Method for degrading perfluorocarboxylic acid pollutant by utilizing microwave radiation
  • Method for degrading perfluorocarboxylic acid pollutant by utilizing microwave radiation

Examples

Experimental program
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Effect test

Embodiment 1

[0017] In this embodiment, the microwave digestion tank is used as the reactor, activated carbon is used as the microwave sensitization medium, and the microwave radiation method is used to degrade PFOA. The specific reaction process is as follows:

[0018] (1) Measure 50ml of PFOA aqueous solution with a concentration of 10mg / L, put the cleaned 80-100 mesh coconut shell activated carbon into the PFOA aqueous solution according to the weight ratio of activated carbon: PFOA aqueous solution (0.01-0.1): 1, and use magnetic stirring The device continued to stir for 50-70 minutes to obtain a mixed solution;

[0019] (2) Transfer the mixed solution obtained in step (1) to a microwave digestion tank lined with polytetrafluoroethylene to start the reaction, set the reaction time to 30-40 minutes, and the microwave radiation power to 800-1000W;

[0020] (3) Take 2ml samples every 5-10 minutes, use a centrifuge to separate the activated carbon in the sample, take the supernatant, then ...

Embodiment 2

[0022] Embodiment 2: the influence of microwave radiation power on PFOA degradation efficiency

[0023] In this example, according to the step (1) of Example 1, prepare six equal volumes of mixed solutions, and put them into microwave ovens respectively to start the reaction. The radiation power was 200W, 400W, 600W, 800W, 1000W and 1200W respectively, and the influence of microwave radiation power on the degradation efficiency of PFOA was tested. The results are as follows: figure 1 shown by figure 1 It can be seen that the degradation efficiency of PFOA increases with the increase of microwave radiation power. When the microwave radiation power is 1200W, the degradation efficiency of PFOA is as high as 99.1%. In the microwave radiation field, the water molecules, PFOA molecules and activated carbon in the reaction system Particles do violent irregular thermal motion instantly, increasing the microwave radiation power can increase the microwave radiation intensity of the rea...

Embodiment 3

[0024] Example 3: Effect of the amount of microwave sensitization medium (activated carbon) on the degradation efficiency of PFOA

[0025] In this example, six equal volumes of mixed solutions are prepared according to the step (1) of Example 1, and they are respectively put into a microwave oven to start the reaction. The microwave radiation power is set to 1000W, and the microwave radiation time is 40min. The weight ratio is 0.02:1, 0.05:1, 0.1:1, 0.2:1 and 0.3:1, respectively, and activated carbon is added to the PFOA aqueous solution, and the influence of the amount of activated carbon on the degradation efficiency of PFOA is investigated. The results are as follows: figure 2 shown. Depend on figure 2 It can be seen that the degradation efficiency of PFOA by microwave radiation increases with the increase of the amount of activated carbon. The number of PFOA molecules on the activated carbon increases accordingly. Activated carbon is a microwave-sensitized medium with ...

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Abstract

The invention belongs to the technical field of perfluorocarboxylic acid pollutant treatment and relates to a method for degrading a perfluorocarboxylic acid pollutant by utilizing microwave radiation. The method for degrading the perfluorocarboxylic acid pollutant by utilizing the microwave radiation comprises the following steps: firstly putting coconut shell activated carbon into a perfluoro caprylic acid aqueous solution, and stirring, so that a mixed solution is obtained; then transferring the mixed solution into a microwave digestion tank with polytetrafluoroethylene as lining, and carrying out reaction for 30-40 minutes while power of the microwave radiation is 800-1000W; then taking 2ml sample every 5-10 minutes, separating the activated carbon in the samples by adopting a centrifugal machine, taking supernate, then filtering the supernate by adopting an ultrafiltration membrane with the pore diameter of 0.22 microns, and finally analyzing concentration of the perfluoro caprylic acid in the supernate by adopting a high performance liquid chromatography method, so that degradation of the perfluorocarboxylic acid is realized. The method for degrading the perfluorocarboxylic acid pollutant by utilizing the microwave radiation is simple, safe and reliable, degradation efficiency is high, a microwave radiation degradation reaction accords with a first-order reaction kinetics equation, a reaction half-life period is short, no secondary pollution is produced, and environmental friendliness is realized.

Description

Technical field: [0001] The invention belongs to the technical field of perfluorocarboxylic acid pollutant treatment, and relates to a method for degrading perfluorocarboxylic acid pollutants by microwave radiation, which is used for safely and efficiently removing perfluorocarboxylic acid pollutants in water bodies. Background technique: [0002] With perfluorooctanoic acid (Perfluorooctanoic acid, PFOA, C 7 f 15 COOH) represented perfluorocarboxylic acids (Perfluorocarboxylic acids, PFCAs, C n f 2n+1 COOH) compounds are a newly discovered class of environmental persistent organic pollutants, which have the characteristics of refractory, easy bioaccumulation, toxicity and long-distance environmental migration. PFOA has been widely used due to its stable chemical structure and specific chemical properties It is widely used as an additive in the production of high-efficiency fluorides, and these fluorides are widely used in aviation technology, transportation, electronics ...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/28C02F101/36C02F101/34
Inventor 赵宝秀杨龙王芬李想
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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