Sorbent Polymeric Materials for Formaldehyde Capture
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Solution Overview
Problem
Current sorbent materials for capturing formaldehyde, such as activated carbon, face challenges in incorporating high-density reactive groups due to their inactivity, leading to reduced capacity for formaldehyde capture and adverse effects on adsorbing volatile organic compounds, and impregnation chemistries can migrate and occupy pore spaces, reducing surface area for non-reactive vapor capture.
Innovation Solution
Development of sorbent polymeric materials with multiple aromatic rings and sulfonyl-containing groups (—SO2R5) that react with formaldehyde, formed by treating a precursor polymeric material with a sulfonyl-containing compound, providing a high-capacity sorbent for formaldehyde capture without the drawbacks of impregnation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If activated carbon scaffolds are impregnated with chemistries to react with formaldehyde, then formaldehyde capture capacity is improved, but the surface area available for capturing non-reactive vapors is reduced
Solution Approach 1:
The patent merges the functions of formaldehyde capture and VOC adsorption into a single integrated activated carbon scaffold structure. The scaffold itself is modified to provide reactive sites for formaldehyde while maintaining its porous structure for VOC adsorption, eliminating the need for separate impregnation chemistries that would block pores.
Solution Approach 2:
The invention utilizes the porous structure of activated carbon scaffolds as the primary capture mechanism for both formaldehyde and VOCs. The pores are engineered to maintain accessibility for non-reactive vapor adsorption while incorporating reactive functional groups on the scaffold surface for formaldehyde chemisorption.
2Reliability
If impregnation chemistries are used to increase reactive sites for formaldehyde, then formaldehyde reactivity is improved, but the chemistries can migrate and occupy pore spaces
Solution Approach 1:
The reactive functional groups are pre-incorporated into the activated carbon scaffold structure during its formation process, before the scaffold is deployed for formaldehyde capture. This preliminary incorporation ensures that the reactive sites are fixed in place and cannot migrate, preventing pore space occupation while maintaining high formaldehyde reactivity.
Solution Approach 2:
The invention creates a composite material where the activated carbon scaffold is structurally integrated with reactive functional groups. This composite structure combines the high surface area and porosity of activated carbon with the chemical reactivity needed for formaldehyde capture, eliminating the migration issues associated with separate impregnation chemistries.
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 sorbent polymeric materials effectively capture formaldehyde through chemical reaction, maintaining high capacity and surface area for VOCs, offering a stable and efficient solution for formaldehyde mitigation in both indoor and outdoor environments.
Implementation Method 1
Because formaldehyde is reactive, however, it can be more readily captured through chemisorption. With chemisorption, the formaldehyde vapors are captured by chemically reacting with the sorbent itself or with chemicals impregnated in the sorbent.
Data Source
AI summary
Sorbent polymeric material suitable for capturing formaldehyde, polymeric material resulting from the capture of formaldehyde by the sorbent polymeric material, and methods for capturing formaldehyde are provided. The sorbent polymeric material has multiple aromatic rings and can be formed by initially preparing a precursor polymeric material from a polymerizable composition that contains a free-radically polymerizable spirobisindane monomer. The precursor polymeric material is subsequently treated with a sulfonyl-containing compound to form groups of formula —SO2R5 where each R5 is independently —NH2 or —NR6-Q-NR6R7. Each R6 is hydrogen or an alkyl. Each R7 is hydrogen or —C(═NH)—NH2. Each Q is a single bond, alkylene, or a group of formula -(Q1-NR6)x-Q2- where each Q1 is an alkylene, each Q2 is an alkylene, and x is in an integer in a range of 1 to 4.