Graphene-Modified Polyurethane Foam Membrane for Rapid Oil-Water Separation
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Solution Overview
Problem
Conventional methods for separating oil-water mixtures are inefficient and time-consuming, failing to meet current demands for effective separation, particularly in industrial applications where water in fuels can lead to corrosion, mechanical wear, and bio-contaminant growth.
Innovation Solution
A hydrophilic graphene-modified polyurethane foam membrane is synthesized by functionalizing graphene oxide particles with tartronic acid and reacting them with polyurethane, creating a membrane with high water adsorption capacity and selective oil-water separation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional separation methods (gravity-driven filtration, combustion, air flotation) are used, then oil-water separation can be achieved, but the process is time-consuming and operationally complex
Solution Approach 1:
The patent replaces conventional mechanical separation methods (gravity-driven filtration, air flotation) with a chemical adsorption system. The functionalized graphene oxide membrane uses chemical functional groups (carboxyl, hydroxyl) to selectively adsorb water molecules from oil-water mixtures, enabling rapid separation without time-consuming mechanical processes or pre-collection steps.
Solution Approach 2:
The patent employs a porous membrane structure made of functionalized graphene oxide. The porous architecture provides high surface area for adsorption while maintaining selective permeability, allowing water to pass through rapidly while blocking oil, thus achieving both high productivity and low time loss simultaneously.
2Reliability
If conventional filtration methods are used, then oil separation can be achieved, but the separation efficiency is insufficient
Solution Approach 1:
The patent creates a composite material by functionalizing graphene oxide with specific chemical groups (carboxyl and hydroxyl groups). This composite structure combines the mechanical strength and porous architecture of graphene oxide with the selective adsorption capability of functional groups, achieving high separation efficiency (99.5% water removal) while maintaining a relatively simple single-layer membrane structure.
Solution Approach 2:
The patent applies local quality by introducing specific functional groups at specific locations on the graphene oxide surface. The carboxyl and hydroxyl groups are distributed across the membrane surface to create localized high-affinity sites for water adsorption, enabling selective water permeation while blocking oil without requiring complex overall membrane architecture.
3Quantity of substance
If hydrophobic materials are used for oil separation, then oil absorption is improved, but water adsorption capacity decreases
Solution Approach 1:
The patent inverts the conventional approach by using hydrophilic functionalized graphene oxide instead of hydrophobic materials. Rather than making the membrane oil-absorbent and water-repellent, the patent creates a water-attracting membrane with carboxyl and hydroxyl groups that selectively adsorb water from oil-water mixtures, achieving high water adsorption capacity (20 g/g) while effectively blocking oil contamination.
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 a separation efficiency of at least 96% with a water flux ranging from 30,925 to 30,500 L m−2 h−1, effectively permeating water while blocking oil, suitable for applications in oil-water separation, water treatment, desalination, and pharmaceutical filtration.
Implementation Method 1
functionalizing graphene oxide particles with tartronic acid to form a functionalized product having a hydrophilic functional group
Implementation Method 2
The functionalized product has a water adsorption capacity of at least 20 g/g
Implementation Method 3
reacting the functionalized product with a polyurethane to form the hydrophilic graphene-modified polyurethane foam membrane
Implementation Method 4
The membrane achieves a separation efficiency of at least 96% with a water flux ranging from 30,925 to 30,500 L m−2 h−1, effectively permeating water while blocking oil
Data Source
AI summary
A method for synthesizing a hydrophilic graphene-modified polyurethane foam membrane, is described. The method includes functionalizing graphene oxide particles with tartronic acid to form a functionalized product having a hydrophilic functional group; and reacting the functionalized product with a polyurethane to form the hydrophilic graphene-modified polyurethane foam membrane. The hydrophilic graphene-modified polyurethane foam membrane has a water adsorption capacity of at least 20 g/g. The hydrophilic graphene-modified polyurethane foam membrane is adapted for a use selected from the use group consisting of oil and water separation, water treatment, desalination, and pharmaceutical filtration.