N,O-Type Multidentate Monomer for Ion-Imprinted Polymers
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Solution Overview
Problem
Current ion-imprinted polymers exhibit low selectivity for metal ions due to similarities in size and charge among metal ions, instability of monomer complexes, and excessive functional monomers leading to non-specific adsorption.
Innovation Solution
A N,O-type multidentate functional monomer (AAPTS-COOH) is synthesized, allowing for the formation of stable complexes with metal ions, reducing non-specific adsorption and enhancing selectivity through a method involving Michael addition and hydrolysis reactions, followed by bulk polymerization to create ion-imprinted polymers with improved recognition capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monodentate ligands are used as functional monomers, then the synthesis process is simple, but the complexes with metal ions are unstable and selectivity is low
Solution Approach 1:
The patent changes the denticity parameter of the functional monomer from monodentate to multidentate (N,O-type), transforming the coordination mode with metal ions from single-point to multi-point binding. This parameter change directly improves complex stability while the systematic design of the multidentate structure avoids excessive complexity
Solution Approach 2:
The patent creates composite functional monomers containing both nitrogen and oxygen donor atoms in a multidentate structure. This composite approach combines the advantages of different donor types to achieve stable and selective metal ion recognition, resolving the contradiction between stability and complexity
2Reliability
If excessive functional monomers are used, then the polymerization process is complete, but non-specific adsorption increases and selectivity decreases
Solution Approach 1:
The patent optimizes the molar ratio parameter of functional monomer to metal ion template, establishing an appropriate stoichiometric relationship. This prevents excessive monomer usage while ensuring complete complexation, thereby reducing non-specific adsorption and improving recognition specificity
Solution Approach 2:
The patent applies precise stoichiometric control rather than excessive monomer addition, using just the right amount of functional monomer needed for specific complex formation. This partial action approach avoids the harmful effects of excess monomer while achieving complete reaction
3Reliability
If metal ions with similar size and charge are separated, then the separation challenge increases, but the need for high selectivity remains
Solution Approach 1:
The patent designs functional monomers with specific local chemical environments containing N and O donor atoms arranged in particular spatial configurations. This local structural differentiation enables the polymer to distinguish between metal ions with similar overall properties by recognizing subtle differences in their coordination chemistry
Solution Approach 2:
The patent changes the chemical composition parameters of the functional monomer to include specific heteroatoms (N, O) with different electron densities and coordination preferences. This allows differentiation of metal ions based on their subtle differences in coordination behavior despite similar size and charge
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 resulting ion-imprinted polymers demonstrate high selectivity for metal ions like Cu2+ and Ni2+, offering improved adsorption capacity and specificity compared to existing materials.
Implementation Method 1
the complexes of these monomers and metal ions are not stable
Implementation Method 2
formation of stable complexes with metal ions
Implementation Method 3
add a cross-linking agent to form a template-containing polymer through a polymerization reaction
Implementation Method 4
a method involving Michael addition and hydrolysis reactions
Implementation Method 5
a method involving Michael addition and hydrolysis reactions
Data Source
AI summary
The present invention disclose a N,O-type multidentate functional monomer(AAPTS-COOH), a preparation method thereof and an application thereof in ion-imprinted polymers, and belongs to the technical field of separation materials. The N,O-type multidentate functional monomer of the present invention is obtained through the Michael addition reaction of N-aminoethyl-γ-aminopropyltrimethoxysilane and acrylic esters, bonding an ester group to the amino group and imine group of N-aminoethyl-γ-aminopropyltrimethoxysilane, and hydrolyzing the ester group with a trifluoroacetic acid solution. The 2 nitrogen atoms and 3 oxygen atoms in the functional monomer can coordinate with metal ions. The N,O-type multidentate functional monomer prepared by the present invention can be used to prepare an ion-imprinted polymer (IIP). The imprinted material has high selective adsorption capacity for copper ions and nickel ions. In addition, the IIP synthesis method based on AAPTS-COOH of the present invention has good universality.