Activated Carbon Pore Tuning for PFAS Air Sampling
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Solution Overview
Problem
Existing collection materials for per- and polyfluoroalkyl compounds, such as cyclodextrin polymers, are unsuitable for quantitative measurement due to poor handling, low adsorption and desorption performance, and risk of powder outflow, while existing activated carbons do not adequately collect and quantify these persistent pollutants.
Innovation Solution
A per- and polyfluoroalkyl compound-adsorbing activated carbon with a BET specific surface area of 900 m2/g or more, featuring a sum of micropores of 0.35 cm3/g or more, mesopores of 0.02 cm3/g or more, and a volume difference of 0.45 or more between micropores and mesopores, along with a surface oxide amount of 0.10 meq/g or more, is used to efficiently adsorb and desorb these compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclodextrin polymer is used as collection material, then adsorption of per- and polyfluoroalkyl compounds is achieved, but desorption performance is poor and handling is difficult
Solution Approach 1:
The patent employs activated carbon with a developed pore structure (BET specific surface area of 900-1500 m²/g, micropore volume of 0.35-0.50 cm³/g) to provide both high adsorption capacity and improved handling characteristics. The porous structure allows efficient compound uptake while the granular form factor facilitates practical operation.
2Reliability
If cyclodextrin polymer is used as collection material, then adsorption of per- and polyfluoroalkyl compounds is achieved, but risk of powder outflow increases
Solution Approach 1:
The patent employs activated carbon with a developed pore structure (BET specific surface area of 900-1500 m²/g, micropore volume of 0.35-0.50 cm³/g) to provide both high adsorption capacity and improved handling characteristics. The porous structure allows efficient compound uptake while the granular form factor facilitates practical operation.
3Ease of operation
If existing activated carbon is used, then handling is improved, but adsorption and desorption performance for per- and polyfluoroalkyl compounds is insufficient
Solution Approach 1:
The patent optimizes specific physical parameters of activated carbon, including BET specific surface area (900-1500 m²/g), micropore volume (0.35-0.50 cm³/g), and iodine adsorption capacity (1000-1500 mg/g), to achieve both satisfactory handling and superior adsorption/desorption performance for per- and polyfluoroalkyl compounds.
Solution Approach 2:
The patent employs activated carbon with a developed pore structure (BET specific surface area of 900-1500 m²/g, micropore volume of 0.35-0.50 cm³/g) to provide both high adsorption capacity and improved handling characteristics. The porous structure allows efficient compound uptake while the granular form factor facilitates practical operation.
4Measurement precision
If collection material with high adsorption capacity is used, then measurement precision improves, but accurate quantitative measurement becomes difficult due to poor desorption
Solution Approach 1:
The patent optimizes specific physical parameters of activated carbon, including BET specific surface area (900-1500 m²/g), micropore volume (0.35-0.50 cm³/g), and iodine adsorption capacity (1000-1500 mg/g), to achieve both satisfactory handling and superior adsorption/desorption performance for per- and polyfluoroalkyl compounds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The activated carbon effectively collects and quantifies per- and polyfluoroalkyl compounds, enhancing adsorption performance and enabling accurate measurement by improving pore structure and surface chemistry.
Implementation Method 1
a per- and polyfluoroalkyl compound-adsorbing activated carbon for desorbably adsorbing per- and polyfluoroalkyl compounds in an atmospheric sample
Implementation Method 2
the compounds adsorbed on the collection material are desorbed into an extraction liquid by an extraction step
Data Source
AI summary
[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.