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Adsorbent for removing PFOS and PFOA in water and preparation method thereof

An adsorbent and water removal technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of complex preparation process, narrow applicable pH range, low adsorption capacity, etc., and achieve good adsorption effect , low price, easy to degrade effect

Active Publication Date: 2012-06-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reported adsorbents include activated carbon, resin and chitosan, etc. Although some adsorption effects have been achieved, there are still shortcomings such as low adsorption capacity, narrow applicable pH range and complicated preparation process.

Method used

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  • Adsorbent for removing PFOS and PFOA in water and preparation method thereof
  • Adsorbent for removing PFOS and PFOA in water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] (a) Preparation of ATRP initiator: Mix cotton with dichloromethane, α-bromoisobutyryl bromide, and pyridine, react at room temperature for 24 hours, then wash with dichloromethane, acetone or tetrahydrofuran, and high-purity water successively, and dry Finally, the ATRP initiator cotton-Br was obtained. The dosage ratio of each substance is: 0.3g cotton: 15mL dichloromethane: 3mL a-bromoisobutyryl bromide: 1mL pyridine.

[0022] (b) ATRP reaction: the ATRP initiator cotton-Br in the presence of water, methanol, N, N, N', N', N "-pentamethyldiethylenetriamine, cuprous bromide, copper bromide Utilize ATRP reaction to initiate DMAEMA monomer polymerization, obtain the cotton that contains PDMAEMA polymer brush after washing and drying with acetone or tetrahydrofuran (THF) and high-purity water, i.e. cotton-g-P (DMAEMA).Described each material consumption ratio is listed as: 0.05g cotton- Br: 1mL H 2 O: 2mL methanol: 3mL DMAEMA: 45 μL N, N, N', N', N"-pentamethyldiethylen...

Embodiment 1

[0030] The preparation steps of the adsorbent in this embodiment are:

[0031](1) Take 0.3g of raw cotton and put it into a test tube, then add dichloromethane (15mL), a-bromoisobutyryl bromide (3mL) and pyridine (1mL) in sequence, mix well and seal it with a rubber stopper. The tube was placed in a shaker with a temperature of 25°C and a rotational speed of 150 rpm, and was taken out after 24 hours of reaction, and washed with dichloromethane, acetone, and high-purity water in sequence, so that the ATRP initiator was introduced on the cotton surface, and the tube was prepared. get cotton-Br;

[0032] (2) Get 0.05g of the above ATRP initiator cotton-Br and put it into a round bottom flask, then add H 2 O (1mL), methanol (2mL), DMAEMA (3mL) and N, N, N', N', N"-pentamethyldiethylenetriamine (45 μL), then feed nitrogen into the reaction flask, so that Remove the oxygen in the bottle, and add 18 mg of cuprous bromide and 3.6 mg of copper bromide under the condition of nitrogen ...

Embodiment 2

[0036] The preparation steps of the adsorbent in this embodiment are:

[0037] (1) Take 0.3g of raw cotton and put it into a test tube, then add dichloromethane (15mL), a-bromoisobutyryl bromide (3mL) and pyridine (1mL) in sequence, mix well and seal with a rubber stopper. The tube was placed in a shaker with a temperature of 25°C and a rotational speed of 150 rpm, and was taken out after 24 hours of reaction, and washed with dichloromethane, acetone, and high-purity water in sequence, so that the ATRP initiator was introduced on the cotton surface, and the tube was prepared. get cotton-Br;

[0038] (2) Get 0.05g of the above ATRP initiator cotton-Br and put it into a round bottom flask, then add H 2 O (1mL), methyl alcohol (2mL), DMAEMA (3mL), cuprous bromide (18mg), cupric bromide (3.6mg), feed nitrogen into reaction bottle then, can remove the oxygen in bottle like this, and in 45 μL of N, N, N′, N′, N″-pentamethyldiethylenetriamine under nitrogen gas. After 15 minutes of...

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Abstract

The invention provides an adsorbent for removing PFOS and PFOA in water and a preparation method thereof. The adsorbent comprises cotton as a parent material, and quaternary ammonium salt is formed on the surface on the adsorbent. The use of the adsorbent can effectively remove PFOS and PFOA in water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an adsorbent for efficiently removing PFOA and PFOS and a preparation method thereof. Background technique [0002] Perfluorinated compounds (PFCs) are a series of artificially synthesized compounds in which all hydrogens attached to carbon atoms are replaced by fluorine, usually containing a hydrophobic alkyl chain and a hydrophilic functional group. Since fluorine is the most electronegative element in the periodic table, after the hydrogen on the hydrocarbon chain is replaced by fluorine, the C-F bond energy is 485.3kJ / mol, which is much higher than the original C-H bond energy of 416.7kJ / mol. PFCs have very stable chemical properties and are difficult to be degraded by physicochemical methods and biodegradation, which leads to the persistent existence of PFCs in the environment and can be bioaccumulated, with the characteristics of persistence, bioaccumulation, pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/14
Inventor 邓述波牛利黄俊余刚
Owner TSINGHUA UNIV
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