Hierarchical Pore Silica Aggregate for Cesium Adsorption
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Solution Overview
Problem
Existing adsorbents, such as zeolites, struggle to effectively adsorb target substances like cesium, strontium, and ruthenium from liquid wastes containing high levels of impurities, requiring repetitive adsorption and elution steps and complex system configurations.
Innovation Solution
A silica aggregate composed of primary silica particles with an average size of 1 nm to 10 nm, crosslinked by siloxane bonds and containing aluminum oxide, which enhances the adsorption capacity by forming a three-dimensional network and increasing the specific surface area, allowing for higher proportion adsorption of target substances in a single operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zeolite is used as adsorbent to remove target substances from liquid waste, then adsorption function is provided, but adsorption efficiency decreases when large amounts of impurities are present
Solution Approach 1:
The patent applies local quality by creating a hierarchical pore structure with different pore sizes (macro-pores, meso-pores, and micro-pores) within the silica aggregate. The micro-pores (1-10 nm) specifically target and adsorb target substances like cesium and strontium ions, while the larger macro-pores allow efficient liquid flow and reduce interference from bulk impurities. This localized functional differentiation within the adsorbent structure enables selective high-efficiency adsorption even in impure liquid waste.
2Quantity of substance
If adsorption and elution steps are repeated to increase target substance adsorption, then adsorption amount increases, but operation complexity and system configuration become complicated
Solution Approach 1:
The patent applies preliminary action by pre-forming a hierarchical pore structure within the silica aggregate before the adsorption process begins. The macro-pores are pre-created to facilitate rapid liquid penetration and impurity bypass, while micro-pores are pre-positioned for target substance capture. This preliminary structural preparation enables the adsorbent to achieve high adsorption capacity in a single pass without requiring repetitive adsorption-elution cycles, thereby simplifying the overall system configuration.
Solution Approach 2:
The patent implements continuity of useful action through the hierarchical pore structure that enables continuous efficient adsorption. The macro-pores maintain continuous liquid flow pathways that prevent clogging and ensure steady-state operation, while micro-pores continuously capture target substances as liquid passes through. This continuous effective adsorption action eliminates the need for intermittent repeated cycles, reducing operational complexity.
3Ease of operation
If adsorbent structure is simplified for easier operation, then ease of operation improves, but adsorption capacity may be reduced
Solution Approach 1:
The patent applies dimensionality change by transitioning from a conventional uniform pore structure to a hierarchical multi-scale pore architecture. This hierarchical structure operates across multiple length scales (macro-pores >100 nm, meso-pores 10-100 nm, micro-pores 1-10 nm), effectively adding a structural dimension that simultaneously enhances adsorption capacity through micro-pore surface area while maintaining operational simplicity through macro-pore flow pathways. The multi-dimensional pore network resolves the trade-off between capacity and ease of operation.
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 silica aggregate effectively adsorbs target substances like cesium and strontium with improved efficiency, reducing the need for repetitive operations and simplifying system configurations, while maintaining stability and preventing particle outflow, thus enhancing the adsorption process.
Implementation Method 1
the primary silica particles being crosslinked to each other by a bond containing a siloxane bond
Implementation Method 2
the silica aggregate effectively adsorbs target substances like cesium and strontium with improved efficiency
Data Source
AI summary
A silica aggregate includes primary silica particles aggregated, the primary silica particles having an average particle size of 1 nm or more and less than 10 nm, the primary silica particles being crosslinked to each other by a bond containing a siloxane bond.