Deep Eutectic Solvent Bimetallic MOF Electrode for Safer CDI Synthesis
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Solution Overview
Problem
Existing capacitive deionization technologies using bimetallic MOF/graphite composites with organic solvents have low fluoride ion removal efficiency and high safety risks due to high-temperature hydrothermal methods.
Innovation Solution
A bimetallic metal-organic framework electrode material is prepared using a deep eutectic solvent, which acts as both a solvent and structure-directing agent, forming an iron-nickel composite with activated carbon to enhance ion adsorption and separation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature hydrothermal method is used to prepare bimetallic MOF/graphite composite electrode material, then the electrode material can be synthesized, but safety risks increase during the generation process
Solution Approach 1:
The patent changes the synthesis temperature parameter from high-temperature hydrothermal conditions to room temperature or mild heating conditions by using deep eutectic solvent as the reaction medium. This parameter change maintains the ability to synthesize functional bimetallic MOF electrode materials while significantly improving safety and reducing energy consumption.
Solution Approach 2:
The patent introduces deep eutectic solvent as an intermediary medium to replace traditional high-temperature hydrothermal conditions. The deep eutectic solvent acts as a green solvent and structure-directing agent that enables MOF synthesis at lower temperatures, thereby improving safety while maintaining material functionality.
2Reliability
If organic solvent is used as ligand solution in bimetallic MOF synthesis, then the synthesis can proceed, but fluoride ion removal efficiency decreases
Solution Approach 1:
The patent converts the potential harm of using solvents by replacing harmful organic solvents with benign deep eutectic solvents. The deep eutectic solvent not only serves as a safe alternative but also acts as a structure-directing agent that enhances the electrode material's fluoride ion removal efficiency, turning a potential compromise into a dual benefit.
Solution Approach 2:
The patent changes the chemical composition parameter of the ligand solution from organic solvent to deep eutectic solvent (composed of hydrogen bond donor and acceptor). This parameter change eliminates the harmful effects of organic solvents while improving fluoride ion removal efficiency through the unique properties of deep eutectic solvents.
3Reliability
If deep eutectic solvent is used as ligand solution, then fluoride ion removal efficiency improves, but the synthesis process complexity increases
Solution Approach 1:
The patent applies deep eutectic solvent that performs multiple functions simultaneously: it serves as the ligand solution, structure-directing agent, and green solvent. This multi-functionality simplifies the overall synthesis process by eliminating the need for separate additives or post-treatment steps, thereby reducing process complexity despite the improved performance.
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 deep eutectic solvent-based material achieves efficient removal of salt ions from water with improved adsorption capacity and safety, enabling large-scale synthesis with low-cost, readily available components.
Implementation Method 1
Components in the deep eutectic solvent, such as chloride ions and choline ions, can coordinate with metal ions and act as templates or ligands to guide pore formation, regulate the pore structure of MOFs
Implementation Method 2
adding a soluble iron salt and a soluble nickel salt to the mixed solvent, dissolving by ultrasonication, then adding activated carbon powder and a dispersant, mixing by ultrasonication
Implementation Method 3
CDI technology is based on the electric double layer physical adsorption theory, which drives charged ions in the solution to migrate towards the porous electrode and form an electric double layer adsorption by applying a directional electrostatic field
Implementation Method 4
drives charged ions in the solution to migrate towards the porous electrode by applying a directional electrostatic field
Implementation Method 5
bimetallic MOFs, through the synergistic effect of heterogeneous metal centers, can induce the formation of lattice defects, significantly increase the concentration of coordinatively unsaturated sites, and improve charge transfer efficiency through the bimetallic electronic coupling effect
Data Source
AI summary
The present invention relates to the field of water treatment technology, and specifically relates to a bimetallic organic framework electrode material based on a deep eutectic solvent. The electrode material is prepared by mixing a deep eutectic solvent with water, a soluble iron salt and a soluble nickel salt, dissolving by sonication, adding activated carbon powder and a dispersant, and then adding 2-methylimidazole to obtain an iron-nickel bimetallic organic framework activated carbon composite material. The iron-nickel bimetallic organic framework composite material is mixed with a conductive agent and a binder to obtain an electrode slurry, which is dried to obtain an electrode material. The present invention uses a deep eutectic solvent to generate an iron-nickel bimetallic composite carbon capacitive deionization electrode material, and applies it to a hybrid capacitive deionization device to achieve the removal of salt ions in water.