Silane-Modified Zeolite Adsorbent for Extreme pH Contaminant Removal
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Solution Overview
Problem
Current modified zeolites have limited performance in capturing contaminants in extreme pH environments, limited adsorption capacity, and are difficult to recycle, requiring buffering agents and resulting in increased operational costs and material disposal issues.
Innovation Solution
An enhanced zeolite material incorporating metal oxides, such as lanthanum oxide, which increases adsorption capacity, thermal stability, and allows for regeneration, enabling effective contaminant removal across a wider pH range and multiple reuse cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If modified zeolite materials are functionalized to increase contaminant capacity, then adsorption capacity is improved, but the material becomes difficult to recycle and requires buffering agents in extreme pH conditions
Solution Approach 1:
The patent applies parameter changes by modifying the functionalization method to use silane-based compounds that create pH-stable bonds between the zeolite surface and functional groups. This chemical modification allows the material to maintain high contaminant capacity while becoming stable across a broader pH range (pH 2-12), eliminating the need for buffering agents and enabling easy recycling through simple filtration and regeneration processes.
Solution Approach 2:
The patent creates composite materials by combining zeolite with silane-based functional groups and metal oxides (such as iron oxide, manganese oxide, or titanium oxide). This composite structure integrates the high surface area and porosity of zeolite with the pH stability and catalytic properties of metal oxides, achieving both high contaminant capacity and recyclability without requiring buffering agents.
2Reliability
If buffering agents are added to enable modified zeolite operation in extreme pH conditions, then pH stability is improved, but operational cost and processing time increase
Solution Approach 1:
The patent applies self-service by designing zeolite materials with intrinsic pH stability through silane-based functionalization. The material automatically maintains its structural integrity and functional performance across extreme pH conditions without requiring external buffering agents. This self-stabilizing property eliminates the need for additional chemicals and simplifies the treatment process, improving both reliability and productivity.
3Quantity of substance
If functionalized zeolite materials are used to capture contaminants, then contaminant removal efficiency is improved, but the materials cannot be easily regenerated and must be disposed of after saturation
Solution Approach 1:
The patent applies discarding and recovering by designing functionalized zeolite materials that can be easily regenerated after contaminant saturation. The silane-based functional groups and metal oxide components allow for simple desorption processes using mild acids, bases, or chelating agents, enabling the material to be recovered and reused multiple times. This eliminates the need for disposal of saturated materials and reduces waste generation.
4Reliability
If calcination temperature is increased above 600°C to improve material stability, then thermal stability is improved, but meso-structure collapses and surface area decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the calcination temperature range to 400-600°C, which is lower than conventional treatments. This controlled thermal treatment achieves sufficient crystallinity and thermal stability while preserving the mesoporous structure and high surface area. The silane-based functionalization provides the necessary thermal stability at these lower temperatures, eliminating the need for high-temperature calcination that would collapse the porous structure.
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 enhanced zeolite exhibits a significantly higher contaminant capture capacity and thermal stability, allowing for efficient removal of phosphorus and other contaminants across a broader pH range, with the ability to regenerate and reuse the material, reducing operational costs and waste.
Implementation Method 1
The porous nature of zeolites allows for adsorption of contaminants in fluid as the contaminated fluid is exposed to zeolite
Implementation Method 2
Target contaminants flowing through the modified zeolite interact with the compound causing the target contaminant to bind to the compound which is bound to the zeolite, removing the target contaminant from the fluid
Data Source
AI summary
The present disclosure provides enhanced zeolites and methods of making and using same.