Functionalized Carbon Nanotubes for Radionuclide Extraction
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Solution Overview
Problem
Current methods for extracting radionuclides such as actinides and lanthanides from nuclear waste are inefficient and generate secondary waste, requiring the development of more selective and efficient extractants capable of operating in acidic or high salinity solutions.
Innovation Solution
Functionalized carbon nanotubes with phosphorous-containing, malonamide, diglycolamide, crown ether, calixcrown, polyethylene glycol, and cobalt dicarbollide derivatives are used as solid extractants to selectively remove radionuclides from organic and aqueous solutions, offering improved stability and efficiency in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional liquid-liquid extraction methods are used to extract radionuclides from nuclear waste, then extraction capacity is achieved, but secondary waste is generated and selectivity is insufficient
Solution Approach 1:
The patent employs functionalized carbon nanotubes as a porous solid extractant material. The nanotube structure provides high surface area and porosity for radionuclide binding, enabling efficient extraction while avoiding the secondary waste generation associated with conventional liquid-liquid extraction solvents
Solution Approach 2:
The patent uses composite materials consisting of carbon nanotubes functionalized with specific ligands (such as crown ethers, calixcrown derivatives, malonamide, diglycolamide derivatives, polyethylene glycol derivatives, cobalt dicarbollide derivatives, and N-donating heterocyclic ligands). These composite structures provide both the structural stability of carbon nanotubes and the selective binding capabilities of the functional groups, achieving high selectivity for actinides and lanthanides
2Reliability
If current extractants are used in acidic or high salinity solutions, then radionuclide extraction is performed, but extraction efficiency and stability are reduced
Solution Approach 1:
The patent modifies the chemical parameters of the extractant by functionalizing carbon nanotubes with various ligand types tailored for specific radionuclides. This parameter optimization enables the extractant to maintain high extraction efficiency and stability in acidic or high salinity solutions, overcoming the limitations of conventional extractants
3Productivity
If solid-liquid separation is implemented using functionalized carbon nanotubes, then radionuclide removal efficiency is improved, but process complexity increases
Solution Approach 1:
The patent extracts the radionuclides from the aqueous or organic solution phase by contacting with solid functionalized carbon nanotubes. The radionuclides are selectively bound to the nanotube surface, allowing for simple solid-liquid separation. This approach simplifies the overall process compared to multi-step liquid-liquid extraction while maintaining high removal efficiency
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 use of functionalized carbon nanotubes enables effective extraction of radionuclides with high selectivity and stability, reducing waste volume and avoiding secondary pollution, and can be applied in both organic and aqueous phases, enhancing nuclear waste reprocessing efficiency.
Implementation Method 1
extractant functionalized carbon nanotubes can be used for extracting radioactive nuclides from nuclear waste or spent nuclear fuel
Implementation Method 2
phosphorous-containing (such as phosphine oxides, phosphoric acids or phosphates) organic extractants and other predesigned extractants (such as crown ethers, calixcrown derivatives, malonamide and diglycolamide derivatives) can be covalently and/or non-covalently employed on the surfaces and/or ends (tips) of carbon nanotubes
Data Source
AI summary
Methods and compositions to extract radionuclides such as various actinides and lanthanides from organic and/or aqueous solutions by utilizing extractant functionalized carbon nanotubes are disclosed. More particularly, phosphorous-containing (such as phosphine oxides, phosphoric acids or phosphates) organic extractants and other predesigned extractants (such as crown ethers, calncrown derivatives, malonamide and diglycolamide derivatives, polyethylene glycol derivatives, cobalt dicarbollide derivatives, and N-donating heterocyclic ligands) can be covalently and/or non-covalently employed on the surfaces and/or ends (tips) of carbon nanotubes for the purpose of removal radionuclides such as various actinides and lanthanides from organic and/or aqueous solutions. Extractant functionalized carbon nanotubes can be used for extracting radioactive nuclides from nuclear waste or spent nuclear fuel, which are produced and/or reprocessed from the nuclear power generation or other nuclear application.