Activated Carbon Pore Structure for 1,1,1-Trichloroethane Adsorption
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Solution Overview
Problem
Conventional activated carbon struggles to effectively remove 1,1,1-trichloroethane and other trihalomethane compounds from water, especially under dynamic adsorption conditions, due to insufficient development of mesopores which can lead to erosion of micropores and reduced adsorption performance.
Innovation Solution
The development of activated carbon with a specific pore structure, including a pore volume of 0.04 cm3/g or more with pore diameters between 20 Å and 300 Å, and a peak in the log differential pore volume distribution at 100 Å, achieved through steam activation of phenol resin derivatives loaded with calcium or potassium compounds, maintains micropore volume and enhances mesopore development for improved adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mesopore volume ratio is increased to improve adsorption of organic halogen compounds, then adsorption performance is improved, but micropores may be eroded and adsorption performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore diameter distribution parameters, specifically setting the mesopore volume ratio to 10-40% and the specific surface area of micropores to 600-2500 m2/g. This balanced parameter optimization allows mesopores to serve as effective introduction channels while preventing micropore erosion, resolving the contradiction between improving adsorption performance and maintaining micropore integrity.
2Ease of manufacture
If conventional activated carbon is used, then manufacturing simplicity is maintained, but removal efficiency of 1,1,1-trichloroethane is insufficient
Solution Approach 1:
The patent applies local quality by creating different pore structures in different regions of the activated carbon pore system. Specifically, micropores (<20 Å) provide high surface area (600-2500 m2/g) for adsorption, while mesopores (20-300 Å) with controlled volume ratio (10-40%) serve as introduction channels. This localized functional differentiation enables efficient removal of 1,1,1-trichloroethane while maintaining manufacturability through controlled carbonization and activation processes.
3Speed
If pore diameter is increased to facilitate diffusion, then contact efficiency improves, but adsorption capacity may be reduced
Solution Approach 1:
The patent applies segmentation by dividing the pore system into two distinct segments: micropores (<20 Å) with high specific surface area (600-2500 m2/g) for adsorption capacity, and mesopores (20-300 Å) with controlled volume ratio (10-40%) for diffusion. This segmentation allows each pore type to fulfill its specific function optimally, with mesopores facilitating rapid contact efficiency and micropores providing sufficient adsorption capacity for 1,1,1-trichloroethane removal.
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
This approach results in superior equilibrium adsorption and adsorption performance of 1,1,1-trichloroethane under water conducting conditions, with increased diffusion and removal rates, making the activated carbon suitable for water purification.
Implementation Method 1
an activated carbon with excellent adsorption performance and process for producing same
Implementation Method 2
achieved through steam activation of phenol resin derivatives loaded with calcium or potassium compounds
Implementation Method 3
loaded with calcium or potassium compounds
Data Source
AI summary
The object of the present invention is to provide an activated carbon with a large equilibrium adsorption amount of 1,1,1-trichloroethane. And the activated carbon of the invention comprising: an equilibrium adsorption amount of 1,1,1-trichloroethane is 20 mg/g or more and a pore volume with the pore diameters of more than 20 Å and 300 Å or less is 0.04 cm3/g or more.