Selective Metal Ion Removal via Functionalized Polymer Aggregates
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Solution Overview
Problem
Current methods for removing metal ions from dilute aqueous solutions, such as those in industrial effluents, face challenges in selectivity, cost-effectiveness, and environmental sustainability, particularly in separating specific metal ions from mixtures with similar charges, like Zn2+ from Pb2+, due to high capital costs, complex operations, and secondary pollution issues.
Innovation Solution
A process using functionalized polymers and surfactants to selectively remove target metal ions by forming self-flocculating polymer-surfactant aggregates, which allows for the preferential binding of specific ions and their subsequent easy recovery with minimal waste and low environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical precipitation is used to remove metal ions, then capital cost is low and the process is straightforward, but selectivity is poor and sludge treatment cost is high
Solution Approach 1:
The patent introduces a functionalized polymer as an intermediary substance that selectively binds to specific metal ions through functional groups. This mediator enables selective removal of target ions (e.g., Zn2+) from mixed solutions without requiring complex equipment, thus achieving both selectivity and process simplicity.
Solution Approach 2:
The patent modifies polymer properties by introducing specific functional groups (carboxyl, hydroxyl, amino, etc.) and controlling molecular weight and charge density. These parameter changes enable the polymer to selectively interact with target metal ions while remaining soluble and easy to handle in aqueous solutions.
2Manufacturing precision
If ion exchange is used to remove metal ions, then selectivity is high, but capital cost is high and operation is complex
Solution Approach 1:
The patent extracts the selective binding function from complex ion exchange resins and implements it using simple functionalized polymers in solution. This allows selective metal ion removal without requiring fixed-bed columns, regeneration systems, or complex solid-liquid separation equipment, thus achieving high selectivity with simple operations.
Solution Approach 2:
The patent uses inexpensive, water-soluble functionalized polymers that can be easily discarded after use through simple filtration or settling, replacing expensive and complex ion exchange resins that require regeneration. This approach prioritizes low cost and operational simplicity over complete reusability.
3Manufacturing precision
If adsorption is used to treat dilute systems, then effectiveness can be good, but cost is high and selectivity is limited
Solution Approach 1:
The patent optimizes polymer parameters including molecular weight (10^4 to 10^7), charge density (1-50 mmol/g), and functional group composition to achieve high effectiveness for dilute metal ion solutions. By adjusting these parameters, the polymer maintains high selectivity and binding capacity while remaining cost-effective compared to commercial adsorbents.
4Manufacturing precision
If membrane filtration is used for selective removal, then selectivity based on size is achieved, but capital cost is high and membrane fouling occurs
Solution Approach 1:
The patent uses functionalized polymers as intermediary binding agents that selectively complex with target metal ions, forming larger aggregates that can be easily separated by simple filtration or settling. This intermediary approach achieves selectivity without requiring expensive membrane systems, avoiding both high capital cost and membrane fouling issues.
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 enables efficient, selective, and cost-effective recovery of valuable metals from dilute solutions with high purity and recyclability of the removal agent, outperforming existing technologies in selectivity, treatment speed, and environmental sustainability.
Implementation Method 1
the functionalised polymer comprises groups that bind preferentially to the first charged species
Implementation Method 2
forming self-flocculating polymer-surfactant aggregates
Implementation Method 3
the bound metal ions are thus separated from free ions in solution using ultrafiltration or settling
Data Source
AI summary
The present invention relates to a process for selectively removing a first charged species from a plurality of charged species in solution, which process comprises: treating a solution with a functionalised polymer and a surfactant, wherein the solution comprises a plurality of charged species dissolved in a solvent, wherein the plurality of charged species comprises the first charged species and at least one further charged species which is different from the first charged species, and wherein the functionalised polymer comprises groups that bind preferentially to the first charged species.