Stimuli-Responsive Polymers for Selective Uranium Capture
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Solution Overview
Problem
Current methods for uranium recovery from seawater and uranium reprocessing from spent nuclear fuel are hindered by the competition from vanadium and the use of toxic, expensive complexing compounds, and existing polymers are inefficient due to their fixed solubility properties.
Innovation Solution
Development of novel polymers that can switch between soluble and insoluble states based on environmental conditions, comprising monomer units derived from 4-vinylpyridine with specific substituents, allowing for selective uranium capture and complexation, and can be used as catalysts or for biomedical marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current polymers are used for uranium capture from seawater, then uranium complexation is achieved, but vanadium competition reduces recovery capacity
Solution Approach 1:
The patent modifies specific local regions of the polymer structure by introducing particular functional groups (such as phosphine oxide, sulfone, or carboxylic acid groups) at specific positions relative to the pyridine rings. This local modification creates highly selective binding sites that preferentially complex uranium over vanadium, resolving the selectivity issue while maintaining overall polymer structure.
Solution Approach 2:
The patent changes chemical parameters of the polymer by varying the nature, position, and number of substituents on the pyridine rings. By adjusting these parameters (electron-withdrawing or electron-donating groups, their positions at 2, 3, or 6 locations), the polymer's complexation selectivity and capacity for uranium versus vanadium can be optimized to achieve high recovery capacity with minimal vanadium interference.
2Ease of operation
If soluble polymers are used for uranium capture, then easy handling and recovery are achieved, but polymer poisons accumulate reducing effectiveness
Solution Approach 1:
The patent employs stimuli-responsive polymers that can dynamically change their solubility state in response to environmental triggers such as pH changes, temperature variations, or solvent composition. This dynamic behavior allows the polymer to switch between soluble (for easy handling and deployment) and insoluble (for simplified separation and poison removal) states, extending service life by enabling periodic regeneration.
Solution Approach 2:
The patent utilizes phase transition phenomena where the polymer transitions between soluble and insoluble phases based on external conditions. For example, at certain pH levels or temperatures, the polymer precipitates or aggregates, allowing easy separation from the solution. This phase transition capability facilitates both easy operation during uranium capture and simplified regeneration by removing polymer poisons through phase separation and re-dissolution.
3Quantity of substance
If liquid-liquid extraction processes are used for uranium reprocessing, then uranium recovery from spent fuel is achieved, but toxic compounds and high costs are involved
Solution Approach 1:
The patent employs polymer-based extraction agents that can be used in solid-phase extraction or as soluble polymers that are easily removed. These polymers can be designed as single-use or easily regenerable materials, replacing expensive and toxic liquid extraction agents. The polymer functional groups perform the extraction function without requiring hazardous solvents, reducing both toxicity and operational costs while maintaining effective uranium recovery from spent nuclear fuel.
Solution Approach 2:
The patent substitutes chemical extraction mechanisms with polymer-based complexation mechanisms. Instead of using liquid-liquid extraction with toxic complexing compounds, the invention uses polymers with specific functional groups that selectively complex uranium ions. This substitution eliminates the need for hazardous solvents and complexing agents, reducing toxicity and cost while achieving the same uranium recovery objective through polymer-metal complexation.
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
These polymers enable efficient uranium recovery from seawater and spent nuclear fuel with high yields, avoiding the limitations of vanadium competition and toxic compounds, while also offering adaptable solubility and versatile applications.
Implementation Method 1
these polymers form a uranium-polymer complex, allowing the extraction of uranium from seawater
Implementation Method 2
novel polymers which are both soluble and insoluble depending on the conditions of the medium in which they are found and which can easily change from one state to the other
Data Source
Figure 1A~1B
AI summary
The present invention relates to novel polymers. These polymers contain monomer units derived from 4-vinylpyridine and monomer units derived from a co-monomer. The polymers may be complexed with a metal, and linear or crosslinked. The present invention also relates to methods for preparing these polymers by radical polymerisation, as well as to their use for metal capture in aqueous media, particularly uranium capture in seawater or in final nuclear waste from nuclear power plants.