Lithium-Ion Adsorbent Hydrogel for Permeable, Recyclable Extraction
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Solution Overview
Problem
Current lithium extraction methods face challenges with adsorption materials that are not environmentally friendly, have poor permeability, and are difficult to recycle, limiting their industrial application.
Innovation Solution
A method is developed to prepare a lithium-ion adsorption material using sodium alginate, calcium carbonate, and gluconolactone, involving oxidative ring-opening and aldol condensation reactions, followed by acid-washing and freeze-drying, to create a permeable and recyclable adsorbent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adsorption materials (particles or powders) are used for lithium extraction, then adsorption function is achieved, but permeability is poor and recycling is difficult
Solution Approach 1:
The patent uses sodium alginate hydrogel as a flexible matrix that forms a gel bead structure. This gel structure provides good permeability allowing lithium ion diffusion while maintaining structural integrity for easy recycling. The hydrogel network allows ions to pass through while the bead form prevents crushing and facilitates recovery from brine solutions.
Solution Approach 2:
The patent creates a composite adsorption material by combining sodium alginate hydrogel matrix with lithium-specific ligands (crown ethers or calixarenes). This composite structure integrates the permeability and mechanical stability of the hydrogel with the high selectivity and adsorption capacity of the organic ligands, achieving both good permeability and effective lithium extraction.
2Reliability
If organic adsorption materials with toxic small molecule crown ether monomers are used, then specific lithium ion adsorption is achieved, but environmental friendliness deteriorates
Solution Approach 1:
The patent changes the physical state and chemical environment of the crown ether ligands by embedding them within the sodium alginate hydrogel matrix. This encapsulation modifies their behavior, reducing the toxicity issues associated with free small molecule crown ethers while maintaining their lithium-specific coordination capability. The hydrogel environment provides a safer, more environmentally friendly platform for these otherwise toxic ligands.
Solution Approach 2:
The sodium alginate hydrogel acts as an intermediary medium that hosts the toxic crown ether ligands. This intermediary structure allows the toxic ligands to perform their specific lithium adsorption function while being contained within an environmentally benign hydrogel matrix, reducing their direct harmful impact on the environment during the extraction process.
3Quantity of substance
If inorganic adsorption materials like manganese-based spinel structure are used, then lithium ion adsorption is achieved with 50 mg/g capacity, but environmental friendliness and sustainability deteriorate
Solution Approach 1:
The patent creates a composite system combining the biodegradable, environmentally friendly sodium alginate hydrogel with lithium-specific organic ligands. This composite achieves adsorption capacities comparable to inorganic materials (60-550 mg/g as stated in the patent) while maintaining environmental sustainability through the use of natural polymer-based materials that are non-toxic and biodegradable.
Solution Approach 2:
The patent employs a sustainable approach using naturally derived sodium alginate from seaweed or other plant sources. This renewable, biodegradable material replaces persistent inorganic adsorbents, allowing for environmentally friendly disposal or regeneration after use, thus improving sustainability despite potentially shorter service life compared to inorganic materials.
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 lithium-ion adsorption material achieves high adsorption capacity (60-550 mg/g) and is easily recoverable, enhancing the efficiency and sustainability of lithium extraction.
Implementation Method 1
soaking the sodium alginate hydrogel into an oxidizing solution, and subjecting a resulting solution to oxidative ring-opening reaction to obtain an oxidized sodium alginate hydrogel
Implementation Method 2
mixing the oxidized sodium alginate hydrogel, a dispersant, a solvent and a lithium-based compound, and subjecting an obtained mixture to aldol condensation reaction to obtain a lithium-based sodium alginate hydrogel
Implementation Method 3
The lithium-ion adsorption material has universal applicability, good permeability and stable mechanical properties during dynamic adsorption. The adsorption equilibrium could be reached within 24 hours, and an adsorption capacity for the lithium ions reaches 60 mg/g to 550 mg/g.
Implementation Method 4
subjecting the lithium-based sodium alginate hydrogel to acid-washing and freeze-drying in sequence to obtain the lithium-ion adsorption material
Data Source
AI summary
Disclosed are a lithium-ion adsorption material, a preparation method and use thereof. The preparation method includes: mixing sodium alginate, calcium carbonate, gluconolactone and water to obtain a sodium alginate hydrogel; The soaking the sodium alginate hydrogel into an oxidizing solution, and subjecting a resulting solution to oxidative ring-opening reaction to obtain an oxidized sodium alginate hydrogel; mixing the oxidized sodium alginate hydrogel, a dispersant, a solvent and a lithium-based compound, and subjecting an obtained mixture to aldol condensation reaction to obtain a lithium-based sodium alginate hydrogel; and subjecting the lithium-based sodium alginate hydrogel to acid-washing and freeze-drying in sequence to obtain the lithium ion adsorption material.