Ceramic GO-PEI Nanomembrane Covalent Bonding Stability
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Solution Overview
Problem
Ceramic nanofiltration membranes lack mechanical and chemical stability, making them unsuitable for extreme environments and limiting their application in advanced water treatment processes, particularly in removing low-molecular weight organic materials and ions.
Innovation Solution
A ceramic graphene oxide nanofiltration membrane is developed by alternately stacking graphene oxide (GO) and polyethyleneimine (PEI) on a ceramic membrane using a covalent bond formed in the presence of N-ethyl-N′-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC), enhancing mechanical stability and ion removal ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic membranes are used for nanofiltration, then chemical and thermal stability are improved, but mechanical stability deteriorates
Solution Approach 1:
The patent creates a composite structure by coating ceramic membranes with graphene oxide (GO) and polyethyleneimine (PEI) layers. The GO provides chemical stability and thermal resistance, while the PEI-GO composite structure enhances mechanical strength. The covalent bonding between PEI and GO creates a robust composite material that combines the advantages of both components, resolving the contradiction between chemical stability and mechanical strength.
Solution Approach 2:
The patent applies different materials to different regions of the membrane structure. The ceramic substrate provides chemical stability in the bulk, while the GO-PEI coating layers provide enhanced mechanical strength and nanofiltration functionality at the surface. This local differentiation allows each material to optimize its properties where needed, resolving the mechanical-stability versus chemical-stability contradiction.
2Reliability
If graphene oxide is used to enhance ion removal ability, then removal efficiency is improved, but mechanical stability deteriorates due to swelling
Solution Approach 1:
The patent combines graphene oxide with polyethyleneimine to create a composite coating. The PEI component forms strong covalent bonds with GO, creating a structurally robust composite that maintains mechanical stability even when GO layers are present. This composite structure allows the GO to provide ion removal functionality while the PEI-GO bonding prevents excessive swelling and maintains mechanical integrity.
Solution Approach 2:
The PEI acts as an intermediary between the ceramic substrate and the GO layers. It forms covalent bonds with GO, creating a stable interface that prevents GO swelling from compromising mechanical stability. This intermediary bonding mechanism allows the GO to perform its ion removal function while maintaining overall structural stability.
3Reliability
If ceramic nanofiltration membranes are manufactured using conventional sol-gel process, then chemical stability is improved, but manufacturing complexity increases and defect-free production becomes difficult
Solution Approach 1:
The patent prepares GO and PEI solutions in advance with controlled concentrations and conditions. By pre-preparing these coating solutions with optimal properties, the actual membrane coating process becomes simpler and more controllable. This preliminary preparation reduces the complexity of the manufacturing process while maintaining the chemical stability benefits of ceramic membranes.
Solution Approach 2:
The patent divides the membrane manufacturing into separate stages: ceramic substrate preparation, GO coating, and PEI coating. Each stage can be optimized and controlled independently, reducing the overall manufacturing complexity. This segmented approach allows for defect-free production by addressing each layer's requirements separately rather than attempting to manufacture the complete nanofiltration membrane in a single complex process.
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 membrane exhibits improved mechanical stability, resistance to extreme environments, and effective ion removal, enabling its use in advanced water treatment processes, including semiconductor wastewater treatment, with reduced interlayer spacing for enhanced contaminant removal.
Implementation Method 1
allowing a carboxyl group (—COOH) and an amine group (—NH2) to form a covalent bond in the presence of EDC, thereby forming an amide group (—CONH)
Implementation Method 2
a ceramic nanomembrane by allowing a carboxyl group (—COOH) and an amine group (—NH2) to form a covalent bond in the presence of EDC, thereby forming an amide group (—CONH)
Implementation Method 3
The membrane filtration process using a nanofiltration (NF) membrane is in the spotlight as an advanced water treatment process
Data Source
AI summary
The present disclosure relates to a ceramic graphene oxide nanofiltration membrane which is high in mechanical stability while having ion removal ability by alternately stacking GO and PEI on a ceramic nanomembrane by allowing a carboxyl group (—COOH) and an amine group (—NH2) to form a covalent bond in the presence of N-ethyl-N′-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC), thereby forming an amide group (—CONH), and a method for manufacturing the same.