Sol-Gel Adsorbent for Aldehyde Removal in Humid Air
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Solution Overview
Problem
Conventional adsorbent materials for removing aldehydes, such as formaldehyde, suffer from decreased mechanical resistance and probe molecule migration in humid or tropical atmospheres, leading to reduced effectiveness in air purification.
Innovation Solution
A nanoporous sol-gel material is developed using certain organic acids and probe molecules, which is prepared through a process involving an alkoxysilane-type sol-gel precursor, an inorganic and/or organic acid, and a probe molecule with a specific general formula, ensuring improved mechanical resistance and preventing probe molecule migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adsorbent materials are used to remove aldehydes, then aldehyde removal function is provided, but mechanical resistance decreases and probe molecule migration occurs in humid atmospheres
Solution Approach 1:
The patent uses a composite material consisting of a porous support (such as silica gel or activated carbon) combined with probe molecules (such as 2,4-dinitrophenylhydrazine or semicarbazide) that are chemically bonded to the support surface. This composite structure provides both the adsorption function for aldehyde removal and the mechanical stability needed in humid conditions, resolving the contradiction between functionality and structural integrity.
Solution Approach 2:
The patent employs porous materials with controlled pore structures to provide high surface area for probe molecule attachment while maintaining mechanical strength. The porous support structure allows efficient diffusion of aldehydes to the probe molecules while the rigid framework prevents collapse and maintains mechanical resistance in humid environments.
2Reliability
If conventional adsorbent materials are used to remove aldehydes, then aldehyde removal function is provided, but probe molecule migrates into ambient air in humid atmospheres
Solution Approach 1:
The patent applies local quality by creating specific functional groups on the adsorbent surface that are localized at the active sites where aldehyde capture occurs. The probe molecules are selectively positioned and chemically bonded at these local sites, ensuring they remain fixed and do not migrate into the ambient air while still providing effective aldehyde removal function.
Solution Approach 2:
The patent changes the chemical parameters of the probe molecule-support system by using strong chemical bonds (such as covalent bonding between the probe molecules and the support surface) instead of weak physical adsorption. This parameter change in bonding strength prevents probe molecule migration in humid conditions while maintaining the aldehyde removal function.
3Device complexity
If probe molecule quantity is reduced in the material, then material cost and complexity are reduced, but trapping performance may decrease
Solution Approach 1:
The patent extracts and concentrates the trapping function into highly active probe molecules that are efficiently distributed on the adsorbent surface. By selecting probe molecules with high aldehyde reactivity and optimizing their concentration, the patent achieves effective trapping performance with reduced probe molecule quantity, simplifying material composition while maintaining reliability.
Solution Approach 2:
The patent changes the concentration parameter of probe molecules in the material to an optimized level that provides sufficient trapping performance without excessive quantity. This parameter optimization, combined with improved probe molecule efficiency through chemical bonding, reduces material complexity while maintaining the required trapping performance for aldehyde 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
The sol-gel material effectively and irreversibly traps aldehydes and ketones from ambient air, maintaining its mechanical integrity and trapping performance even in high humidity conditions, while using a reduced quantity of probe molecules.
Implementation Method 1
The treatment and purification of air by adsorption using adsorbent materials is well-known. This is a surface phenomenon whereby air pollutants such as atoms, ions or molecules (adsorbates) attach themselves to the solid surface of the adsorbent material.
Data Source
AI summary
The present invention concerns an adsorbent porous sol-gel material comprising at least-silane oxides;—an inorganic and/or organic acid with a boiling temperature higher than 100° C.;—a molecular probe of general formula (I) or one of the salts of same in which R1, R2, R3, R4, R5, R6 separately represent a hydrogen atom, a (C1-C6) alkyl group, a (C3-C7) cycloalkyl group, an alkyl-(C3-C7) cycloalkyl group; in which Z represents a spacer group chosen from a (C1-C16) alkyl group, a (C2-C16) alkenyl group, a (C2-C16) alkynyl group, a (C1-C16) halogenoalkyl group, an aryl group, an aryloxy group, a carbocycle group, or an aryl-(C1-C16) alkyl group.