Graphene Oxide Coated Membrane for CO2 Separation
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Solution Overview
Problem
Current gas separation membranes face challenges in maintaining high carbon dioxide permeability and selectivity over nitrogen, hydrogen, or methane while avoiding surface defects and maintaining performance when exposed to water, due to trade-offs in properties and defects during film formation.
Innovation Solution
A composite separation membrane with a graphene oxide coating layer on a porous polymer support, where the graphene oxide layers have pores spaced 0.5 to 1.0 nm apart, functionalized to enhance gas permeability and selectivity, and manufactured using spin coating to prevent defects and ensure high carbon dioxide selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon membranes are manufactured by high-temperature carbonization of polymer precursors, then gas permeability and selectivity are improved, but mechanical properties deteriorate and manufacturing cost increases
Solution Approach 1:
The patent uses a composite structure combining a porous polymer support (providing mechanical strength) with a graphene coating layer (providing gas separation performance). This composite approach allows the membrane to achieve high gas permeability and selectivity without sacrificing mechanical properties, as the polymer support bears the mechanical load while the graphene layer performs the separation function.
Solution Approach 2:
The patent changes the chemical state of the coating layer from reduced graphene (in conventional carbon membranes) to graphene oxide, which can be deposited at lower temperatures. This parameter change allows the membrane to achieve excellent gas separation performance without requiring high-temperature carbonization, thereby preserving the mechanical properties of the polymer support.
2Reliability
If high-temperature carbonization is used to manufacture carbon membranes, then gas separation performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent changes the deposition method from high-temperature carbonization (requiring 600-1000°C and long time) to chemical vapor deposition or atomic layer deposition of graphene oxide, which can be performed at lower temperatures and shorter times. This parameter change maintains excellent gas separation performance while significantly reducing manufacturing time and energy consumption.
3Manufacturing precision
If monolayer membranes are used without supports, then film formation defects are avoided, but gas permeability decreases
Solution Approach 1:
The patent creates a composite membrane with a porous polymer support that provides mechanical strength and allows high gas permeability, combined with a thin graphene oxide coating layer that provides selectivity without blocking gas transport. The porous support structure enables gas to pass through efficiently while the coating layer prevents defects and enhances separation performance.
4Reliability
If graphene coating layer is applied to improve gas permeability and selectivity, then carbon dioxide separation performance is improved, but surface defects may form
Solution Approach 1:
The patent uses graphene oxide as an intermediary coating material that can be deposited uniformly on the porous support surface. The oxide functional groups on graphene oxide improve adhesion to the support and allow for controlled deposition without forming surface defects, while still maintaining the desired gas separation performance.
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 achieves high carbon dioxide permeability and selectivity over other gases, including nitrogen and methane, even when exposed to water, with improved mechanical and chemical stability, suitable for industrial carbon dioxide separation and recovery processes.
Implementation Method 1
graphene oxide coating layer... functionalized to enhance gas permeability and selectivity... high carbon dioxide permeability and selectivity
Implementation Method 2
the graphene oxide layers have pores spaced 0.5 to 1.0 nm apart... selectivity over nitrogen, hydrogen, or methane
Implementation Method 3
porous polymer support... high gas permeability
Implementation Method 4
manufactured using spin coating to prevent defects and ensure high carbon dioxide selectivity
Data Source
AI summary
The present invention relates to a composite separation membrane including a graphene oxide coating layer. The composite separation membrane of the present invention has both high carbon dioxide permeability and high selectivity for carbon dioxide over nitrogen, hydrogen or methane gas, is free of surface defects, and exhibits remarkably increased selectivity for carbon dioxide over other gases (hydrogen, nitrogen, methane, etc.) without any change in carbon dioxide permeability, particularly even when exposed to water. Due to these advantages, the composite separation membrane of the present invention can be applied to industrial fields involving carbon dioxide separation and recovery processes. The present invention also relates to a method for manufacturing the composite separation membrane.