Phyllosilicate-Coated Membranes for Reusable Oil-Water Separation
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Solution Overview
Problem
Existing membranes for separating oils from water are prone to fouling and have limited reusability due to the use of graphene oxide coatings, which are not effective in maintaining separation efficiency over multiple cycles.
Innovation Solution
A composite membrane is developed with a porous support coated by a thin layer of 2D phyllosilicate flakes associated with cations, creating a hydrophilic and oleophobic surface that resists fouling, allowing for repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene oxide coating is used on filtration membranes for oil/water separation, then the membrane can separate oils from water, but the membrane is prone to fouling and has limited reusability
Solution Approach 1:
The invention changes the material parameter from graphene oxide to 2D phyllosilicate flakes, which fundamentally alters the surface properties. This material substitution transforms the membrane from fouling-prone to fouling-resistant while maintaining separation efficiency, enabling multiple reuse cycles without performance degradation
Solution Approach 2:
The invention creates a composite membrane structure by coating 2D phyllosilicate flakes onto a porous support membrane. This composite approach combines the separation capabilities of the porous support with the hydrophilic/oleophobic properties of the phyllosilicate coating, achieving both effective oil/water separation and anti-fouling performance
2Object-affected harmful factors
If a coating is applied to the porous support membrane to provide hydrophilicity and oleophobicity, then fouling resistance is improved, but the coating thickness must be controlled to maintain water flux
Solution Approach 1:
The invention applies a thin coating layer (no more than 1 μm) that provides localized hydrophilic and oleophobic properties at the membrane surface. This thin coating is sufficient to confer fouling resistance and oil rejection while minimizing impact on water flux through the porous support structure
Solution Approach 2:
The invention uses a porous support membrane as the base structure, which inherently provides high water flux. The porous architecture allows water to pass through efficiently while the phyllosilicate coating on the surface provides the selective hydrophilic/oleophobic properties without blocking the pores
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 effectively separates oil and water while resisting fouling, maintaining high separation efficiency and water flux over multiple cycles, even in the presence of salts and emulsions.
Implementation Method 1
wherein the coating is no more than 1 μm thick. In use, said coating will typically be hydrated
Implementation Method 2
The membrane is hydrophilic and, in certain embodiments, superhydrophilic. The membrane is oleophobic when water is present
Implementation Method 3
contacting a first face of a composite membrane with the mixture of the oil and the aqueous medium to provide the separated aqueous medium at a second face of the membrane and the separated oil at a first face of the membrane
Data Source
AI summary
This invention relates to a method of separating oils and aqueous media. The method uses membranes comprising 2D phyllosilicate coatings. The invention also relates to membranes for use in said methods.