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Magnetic fluorinated adsorbent for selective adsorption of PFOS, preparation method and application thereof

A technology of fluorooctane sulfonate and adsorbent, which is applied in the field of magnetic fluorinated adsorbent for selectively adsorbing perfluorooctane sulfonate and its preparation and application, and can solve the problem of poor selectivity, poor adsorption effect, and slow adsorption and other problems, to achieve the effect of no loss in removal rate, easy magnetic separation, and maintenance of magnetic separation characteristics

Active Publication Date: 2017-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current conventional adsorption materials have poor selectivity and slow adsorption. In practical applications, they are affected by inorganic and organic substances in the water environment, and the adsorption effect is poor.

Method used

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  • Magnetic fluorinated adsorbent for selective adsorption of PFOS, preparation method and application thereof
  • Magnetic fluorinated adsorbent for selective adsorption of PFOS, preparation method and application thereof
  • Magnetic fluorinated adsorbent for selective adsorption of PFOS, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Preparation of adsorbent

[0052] (1) Add 200g of vermiculite to deionized water at a mass ratio of 1:12 to water, stir for 4 hours, and settle for 10 hours. Purify by siphon method, take the part with a particle size of <2 μm for centrifugation, dry at 110 degrees Celsius, and grind through a 100-mesh sieve.

[0053] (2) Take 5 g of the vermiculite prepared in step (1) and place it in a 0.5 mol / L quaternary ammonium fluoride iodide solution at 85 degrees Celsius, the mass ratio of the vermiculite to the solution is 1:12, and stir for 10 h.

[0054] (3) Wash the fluorinated vermiculite obtained in step (2) repeatedly in 80% methanol until no organic nitrogen is detected in the washing water, and dry the washed fluorinated vermiculite at 65 degrees Celsius.

[0055] (4) Mix the dried and sieved fluorinated vermiculite with nanometer iron ferric oxide, the mass ratio of the two is 20:1, put them in the ball mill tank, and add stainless steel balls, the ball-to-materia...

Embodiment 2

[0069] 1. Preparation of adsorbent

[0070](1) Add 200g of bentonite to deionized water at a mass ratio of 1:10 to water, stir for 3 hours, and settle for 10 hours. Purify by siphon method, take the part with a particle size of <2 μm for centrifugation, dry at 110 degrees Celsius, and grind through a 100-mesh sieve.

[0071] (2) Take 5 g of bentonite prepared in step (1) and place it in 0.4 mol / L quaternary ammonium iodide fluoride solution at 85 degrees Celsius, the mass ratio of bentonite to solution is 1:15, and stir for 12 hours.

[0072] (3) Wash the fluorinated bentonite obtained in step (2) repeatedly in 70% methanol until no organic nitrogen is detected in the washing water, and dry the washed fluorinated bentonite at 70 degrees Celsius.

[0073] (4) Mix the fluorinated bentonite after drying and sieving with nano-ferric iron tetroxide, the mass ratio of the two is 15:1, place in the ball mill tank, and add stainless steel balls, the ball-to-material ratio is 10:1, C...

Embodiment 3

[0084] 1. Preparation of adsorbent

[0085] (1) Add 200g of montmorillonite into deionized water at a mass ratio of 1:12 to water, stir for 5 hours, and settle for 15 hours. Purify by siphon method, take the part with a particle size of <2 μm for centrifugation, dry at 110 degrees Celsius, and grind through a 100-mesh sieve.

[0086] (2) Take 5 g of the montmorillonite prepared in step (1) and place it in a 0.5 mol / L quaternary ammonium iodide fluoride solution at 80 degrees Celsius, the mass ratio of the montmorillonite to the solution is 1:10, and stir for 15 hours.

[0087] (3) Washing the fluoromontmorillonite obtained in step (2) repeatedly in 90% methanol until no organic nitrogen is detected in the washing water, and drying the washed fluoromontmorillonite at 60 degrees Celsius.

[0088] (4) Mix the fluorinated montmorillonite after drying and sieving with nanometer iron ferric oxide, the mass ratio of the two is 19:1, place in the ball mill tank, and add stainless ste...

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Abstract

The invention discloses a magnetic fluorinated adsorbent for selective adsorption of PFOS, a preparation method and application thereof. The preparation method includes: (1) placing a mineral material with cation exchange capacity in a 0.01-0.5mol / L fluorinated quaternary ammonium iodide solution according to a mass ratio of 1:2-1:20 so as to obtain a fluorinated mineral material; (2) utilizing an organic solvent to wash the fluorinated mineral material so as to obtain a magnetic fluorinated adsorbent crude product; and (3) mixing a nano iron oxide and the magnetic fluorinated adsorbent crude product according to a mass ratio of 1:2-1:50 and conducting ball milling treatment so as to obtain the magnetic fluorinated adsorbent. The adsorption material prepared by the method provided by the invention has very high selectivity, fast adsorption rate and good magnetic separation properties to PFOS, is easy to regenerate and can be used repeatedly. The magnetic fluorinated adsorbent provided by the invention can be used for treatment of wastewater containing PFOS.

Description

technical field [0001] The present invention relates to the field of chemical materials. Specifically, the present invention relates to a magnetic fluorinated adsorbent for selectively adsorbing perfluorooctane sulfonate, a preparation method and its application. More specifically, the present invention relates to a magnetic fluoride adsorbent capable of selectively adsorbing perfluorooctane Magnetic fluorinated adsorbent for octyl sulfonate, a method for preparing magnetic fluorinated adsorbent for selectively adsorbing perfluorooctane sulfonate, magnetic fluorinated adsorbent for selectively adsorbing perfluorooctane sulfonate The use of and a method for regenerating a magnetic fluorinated adsorbent that selectively adsorbs perfluorooctane sulfonate. Background technique [0002] Perfluorooctane sulfonate (PFOS) is a typical perfluorinated compound, which was included in the List of Persistent Organic Pollutants Prohibited by the Stockholm Convention in 2009, which has att...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/32C02F1/28C02F101/36
CPCB01J20/22B01J20/28009B01J20/32C02F1/285C02F2101/36
Inventor 邓述波杜子文王维余刚王斌黄俊王玉珏
Owner TSINGHUA UNIV
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