Graphene Oxide Membrane Bonding for Alkaline Filtration Stability
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Solution Overview
Problem
Existing graphene oxide membranes suffer from durability issues under high temperatures and alkaline pH conditions, and poor adhesion to support layers leads to delamination and compromised filtration performance.
Innovation Solution
Incorporating a sulfonated support with covalently coupled graphene oxide sheets and chemical spacers to enhance adhesion and stability, resulting in improved chemical affinity and mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer membranes are used for filtration, then they provide good filtration performance under normal conditions, but they become damaged or fail under oxidizing conditions, high pH, high temperatures, or in certain solvents
Solution Approach 1:
The patent changes the material composition parameter from conventional polymers to graphene oxide, which fundamentally alters the chemical stability and temperature resistance properties of the membrane, enabling it to withstand oxidizing conditions, high pH, and high temperatures that degrade polymer membranes
Solution Approach 2:
The patent creates a composite structure by depositing graphene oxide layers onto a porous support membrane, combining the chemical stability and thermal resistance of graphene oxide with the mechanical strength and porosity of the support structure, achieving both durability and filtration performance
2Reliability
If graphene oxide membranes are deposited on support layers, then they provide filtration functionality, but poor adhesion leads to delamination and compromised performance
Solution Approach 1:
The patent introduces chemical spacers as intermediary molecules that form covalent bonds between the graphene oxide sheets and the porous support membrane, creating a strong chemical bridge that prevents delamination while maintaining the filtration functionality of the graphene oxide layer
Solution Approach 2:
The patent replaces physical adhesion (mechanical bonding) with covalent chemical bonding between the graphene oxide and support layer, substituting weak van der Waals forces with strong chemical bonds that prevent delamination under operational stress
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 filtration apparatus achieves high rejection rates and stability under harsh conditions, with enhanced adhesion and performance in high temperature and alkaline environments.
Implementation Method 1
each graphene oxide layer including at least one graphene oxide sheet covalently coupled to a chemical spacer
Implementation Method 2
Incorporating a sulfonated support with covalently coupled graphene oxide sheets and chemical spacers to enhance adhesion and stability
Implementation Method 3
membranes can be configured to separate rejects from a filtrate based on size exclusion (i.e., a physical barrier such as pores that are smaller than the excluded particles)
Data Source
AI summary
Filtration apparatus including Graphene Oxide (GO) are described herein. The GO membranes include a plurality of graphene oxide sheets, each of the graphene oxide sheets covalently bound to a chemical spacer. The filtration apparatus can include a GO membrane and a sulfonated polyethersulfone (S-PES). The filtration apparatus can exhibit improved performance with respect to prior art membranes (e.g., high flux and rejection rate) in applications such as pulp and paper processing, which facilitates achieving permeate quality targets. The filtration apparatus described herein can also offer a more stable replacement for reverse osmosis membranes which are known to degrade under strongly alkaline conditions and high temperatures.