Per- and polyfluoroalkyl compound-adsorbing activated carbon

Patent metadata

Field	Value
Publication number	US-2022289578-A1
Application number	US-202017753068-A
Country	US
Kind code	A1
Filing date	Aug 11, 2020
Priority date	Aug 20, 2019
Publication date	Sep 15, 2022
Grant date	—

Abstract

[SUMMARY][OBJECT] To provide a per- and polyfluoroalkyl compound-adsorbing activated carbon having a high collection rate of per- and polyfluoroalkyl compounds in an atmospheric sample, and a filter body using the same.[ACHIEVING MEANS] A per- and polyfluoroalkyl compound-adsorbing activated carbon for desorbably adsorbing per- and polyfluoroalkyl compounds in an atmospheric sample, the activated carbon including an activated carbon adsorbent having a BET specific surface area of 900 m2/g or more, a sum (Vmic) of a volume of micropores of 1 nm or less of 0.35 cm3/g or more, a sum (Vmet) of a volume of mesopores of 2 to 60 nm of 0.02 cm3/g or more, a volume difference (Vs) between the micropore volume (Vmic) and the mesopore volume (Vmet) of 0.45 or more, and a surface oxide amount of 0.10 meq/g or more.

First claim

1 . A per- and polyfluoroalkyl compound-adsorbing activated carbon for desorbably adsorbing per- and polyfluoroalkyl compounds in an atmospheric sample, the activated carbon comprising an activated carbon adsorbent having a BET specific surface area of 900 m 2 /g or more.

2 . The per- and polyfluoroalkyl compound-adsorbing activated carbon according to claim 1 , wherein a sum (V mic ) of a volume of micropores of 1 nm or less of the activated carbon adsorbent is 0.35 cm 3 /g or more.

3 . The per- and polyfluoroalkyl compound-adsorbing activated carbon according to claim 1 , wherein a sum (V met ) of a volume of mesopores of 2 to 60 nm of the activated carbon adsorbent is 0.02 cm 3 /g or more.

4 . The per- and polyfluoroalkyl compound-adsorbing activated carbon according to claim 1 , wherein a volume difference (V s ) between the sum (V mic ) of the volume of micropores and the sum (V met ) of the volume of mesopores of the activated carbon adsorbent as determined by the following formula (i) is 0.45 or more.
[Formula 1] V s =V mic −V met   (i)

5 . The per- and polyfluoroalkyl compound-adsorbing activated carbon according to claim 1 , wherein a surface oxide amount of the activated carbon adsorbent is 0.10 meq/g or more.

6 . The per- and polyfluoroalkyl compound-adsorbing activated carbon according to claim 1 , wherein the activated carbon adsorbent is a fiber-like activated carbon.

7 . A per- and polyfluoroalkyl compound-adsorbing activated carbon filter body, wherein the adsorbing activated carbon according to claim 1 is retained therein.

Assignees

• Futamura Kagaku Kk
• Aist

Inventors

• Yamashita Nobuyoshi
• TANIYASU Sachi
• Kousaka Tsutomu
• Yokoi Makoto
• Hori Chiharu
• Shimamura Kodai
• Asano Takuya

Classifications

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title

• B01J20/28069

  Pore volume, e.g. total pore volume, mesopore volume, micropore volume · CPC title

• B01J20/20 Primary

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J20/28023

  Fibres or filaments (fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence) · CPC title