Activated Carbon Pore Structure for PFAS Removal
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Solution Overview
Problem
Existing water purification methods, such as ozone treatment and activated carbon treatment, are insufficient in removing persistent organic fluorine compounds like perfluoroalkyl compounds from environmental water due to the presence of contaminants like organic matter.
Innovation Solution
A perfluoroalkyl compound-adsorbing activated carbon with specific pore volume and diameter characteristics, designed to efficiently adsorb perfluoroalkyl compounds in water containing contaminants, featuring a pore volume sum of 0.025 cm3/g for pores between 2-50 nm and 0.014 cm3/g for pores between 1.5-2 nm, ensuring effective adsorption while preventing pore clogging by contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional activated carbon treatment is used, then general adsorption capacity is maintained, but adsorption efficiency of perfluoroalkyl compounds in water containing contaminants is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore size distribution of activated carbon, specifically setting the pore volume in the 1.5-2 nm range to 0.014 cm³/g or more and the pore volume in the 2-50 nm range to 0.025 cm³/g or less. This optimized pore structure enables selective adsorption of perfluoroalkyl compounds while preventing pore clogging by larger contaminant molecules, thereby maintaining high adsorption efficiency in contaminated water
Solution Approach 2:
The patent utilizes porous materials by designing activated carbon with a specific pore size distribution, particularly emphasizing micropores (1.5-2 nm) for perfluoroalkyl compound adsorption. The controlled pore structure allows the material to selectively adsorb target compounds while excluding larger contaminants, resolving the contradiction between maintaining adsorption capacity and preventing contaminant interference
2Quantity of substance
If activated carbon with high pore volume is used, then adsorption capacity increases, but pores become clogged by contaminants reducing effectiveness
Solution Approach 1:
The patent resolves this contradiction by changing the pore volume parameters to specific optimized values: pore volume of 1.5-2 nm pores is set to 0.014 cm³/g or more to ensure sufficient adsorption capacity, while pore volume of 2-50 nm pores is limited to 0.025 cm³/g or less to prevent contaminant molecules from entering and clogging the pores. This precise parameter control maintains both capacity and reliability
Solution Approach 2:
The patent applies local quality by creating different pore size regions with distinct functions: micropores (1.5-2 nm) serve as active adsorption sites for perfluoroalkyl compounds, while the limited mesopore volume (2-50 nm) prevents contaminant access. This spatial differentiation of pore qualities enables simultaneous achievement of high capacity and contaminant resistance
3Productivity
If existing water purification facilities are used, then infrastructure is available, but removal efficiency of perfluoroalkyl compounds is insufficient
Solution Approach 1:
The patent enables high removal efficiency in existing facilities by providing activated carbon with optimized pore parameters (0.014 cm³/g or more for 1.5-2 nm pores, 0.025 cm³/g or less for 2-50 nm pores) that can be directly installed in conventional filtration systems. The material's specific pore structure achieves superior perfluoroalkyl compound removal without requiring facility modifications, balancing productivity improvement with minimal complexity increase
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 adsorbs perfluoroalkyl compounds in water with contaminants, enhancing their removal efficiency and suitability for use in water purification systems, including existing facilities and water filters, while maintaining good handleability.
Implementation Method 1
a perfluoroalkyl compound-adsorbing activated carbon which is an activated carbon adsorbent for adsorbing a perfluoroalkyl compound in water containing contaminants
Data Source
AI summary
A perfluoroalkyl compound-adsorbing activated carbon for adsorbing perfluoroalkyl compounds in water containing contaminants, wherein the activated carbon adsorbent has a pore volume sum of 0.025 cm3/g or less of pores having a pore diameter of 2 to 50 nm as measured by the DH plot method, and the activated carbon adsorbent has a pore volume sum of 0.014 cm3/g or more of pores having a pore diameter of 1.5 to 2 nm as measured by the MP plot method.