Metal-Organic Framework Flocculation Filtration
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Solution Overview
Problem
The synthesis of metal-organic frameworks is hindered by inefficient filtration and washing steps, which are time-consuming and reduce productivity, often resulting in poor properties due to slow settling times of these materials.
Innovation Solution
The introduction of a flocculant, such as poly(amic acid), into the suspension to induce flocculation, forming larger aggregates that settle rapidly, allowing for faster isolation and purification of metal-organic frameworks through filtration and washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional filtration and washing steps are used for metal-organic frameworks, then isolation and purification are achieved, but the process is time-consuming and reduces productivity
Solution Approach 1:
A flocculant is introduced as an intermediary substance to bridge individual metal-organic framework particles and form larger aggregates (flocs). This mediator enables rapid settling of the particles through gravity, replacing the time-consuming conventional filtration process and significantly reducing the isolation and purification time while maintaining high productivity
Solution Approach 2:
The particle size parameter of metal-organic frameworks is changed by inducing flocculation, transforming fine suspended particles into larger flocs. This parameter change enables the particles to settle rapidly under gravity, converting a filtration process into a much faster sedimentation process that reduces time loss and increases productivity
2Ease of operation
If conventional filtration methods are used, then metal-organic frameworks are isolated, but settling time becomes a bottleneck
Solution Approach 1:
The flocculant acts as a mediator that facilitates easy separation by creating large, easily settleable aggregates. This makes the isolation process simpler and faster, as the flocs separate readily from the supernatant liquid phase without requiring complex filtration operations
Solution Approach 2:
The isolation process is segmented into two distinct stages: rapid flocculation to form large aggregates, followed by simple gravitational settling. This segmentation allows the time-consuming filtration step to be replaced with a much faster settling operation, reducing overall duration while improving ease of operation
3Productivity
If flocculation is induced to accelerate settling, then space-time yields increase, but particle aggregation may affect surface area properties
Solution Approach 1:
The flocculation process parameters (such as flocculant type, dosage, and addition timing) are optimized to achieve the right balance: creating sufficiently large aggregates for rapid settling while controlling the aggregation extent to preserve the surface area properties of the metal-organic frameworks. This parameter optimization ensures both high productivity and maintained manufacturing precision
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 method significantly accelerates the settling and filtration process, enhancing the space-time yields of metal-organic framework synthesis while maintaining surface area properties comparable to those produced without flocculation.
Implementation Method 1
inducing flocculation of the suspension to form a plurality of flocs
Implementation Method 2
allowing the flocs to separate from the suspension and produce a solid phase comprising metal-organic frameworks and a supernatant liquid phase
Data Source
AI summary
Provided herein are methods of making metal-organic frameworks comprising forming a suspension capable of producing metal-organic frameworks; inducing flocculation of the suspension to form a plurality of flocs; allowing the flocs to separate from the suspension and produce a solid phase comprising metal-organic frameworks and a supernatant liquid phase; separating the solid phase from the supernatant liquid phase; and recovering the metal-organic frameworks from the solid phase. The present methods include dissolving a metal salt and at least one ligand in a solvent to form the suspension.