CuBTTri MOF-Modified Polyamide RO Membrane for Biofouling Resistance
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Solution Overview
Problem
Thin-film composite polyamide reverse osmosis membranes face significant challenges with membrane fouling, particularly biofouling, which reduces permeability and increases operational costs, and existing anti-bacterial modification methods are complex, inefficient, and lead to environmental pollution.
Innovation Solution
Integration of the highly water-stable metal organic framework CuBTTri into the polyamide thin film on an ultrafiltration membrane substrate through interfacial polymerization, providing anti-bacterial and anti-fouling properties by loading CuBTTri using a simple and controlled method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anti-bacterial agents (nano silver, silver nitrate) are introduced into the membrane to improve anti-bacterial properties, then anti-bacterial activity is enhanced, but the anti-bacterial agent is easily released leading to loss of activity and environmental pollution
Solution Approach 1:
The patent combines CuBTTri metal-organic framework material with polyamide membrane to create a composite membrane structure. The CuBTTri provides stable anti-bacterial activity through its framework structure, while the polyamide matrix provides mechanical support and filtration function. This composite approach prevents the release of anti-bacterial agents while maintaining their activity.
Solution Approach 2:
The CuBTTri metal-organic framework is a porous material with high surface area and controlled pore structure. The porous structure allows water permeation while providing numerous active sites for anti-bacterial activity. The framework structure stabilizes the copper species, preventing their release into the environment.
2Reliability
If complex modification methods are used to introduce anti-bacterial agents into the membrane, then anti-bacterial properties are improved, but the modification process becomes complicated and inefficient for commercial production
Solution Approach 1:
The patent combines the anti-bacterial function and the membrane filtration function into a single integrated structure. The CuBTTri is incorporated during the membrane formation process, creating a unified material that performs both functions simultaneously, eliminating the need for separate modification steps.
Solution Approach 2:
The patent adjusts the composition and structure of CuBTTri (metal-organic framework) to optimize both anti-bacterial activity and membrane performance. By controlling the metal node and organic ligand parameters, the material achieves desired properties while maintaining simplicity in the overall membrane fabrication process.
3Productivity
If membrane fouling is not addressed, then membrane operation continues, but permeability decreases and operational costs increase
Solution Approach 1:
The patent incorporates anti-bacterial and anti-fouling properties into the membrane structure before it is deployed. The CuBTTri material actively prevents bacterial adhesion and biofilm formation from the outset, stopping the fouling process before it can reduce permeability or increase operational costs.
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 CuBTTri-loaded membrane exhibits durable anti-bacterial and anti-fouling properties, maintaining high permeability and selectivity, reducing bacterial adhesion, and extending membrane service life while being environmentally friendly and suitable for industrial production.
Implementation Method 1
Integration of the highly water-stable metal organic framework CuBTTri into the polyamide thin film on an ultrafiltration membrane substrate through interfacial polymerization
Implementation Method 2
CuBTTri is a highly water-stable metal organic framework formed by metal copper and a nitrogen ligand through ligand bridging, which has higher stability and anti-fouling efficiency than other metal/metal oxide nanomaterials. Meanwhile, the desirable pore structure of CuBTTri can increase the permeability of the membrane without reducing the selectivity of the membrane
Implementation Method 3
Thin-film composite polyamide reverse osmosis membrane with anti-bacterial and anti-biofouling effects
Data Source
AI summary
A thin-film composite polyamide reverse osmosis membrane with anti-bacterial and anti-biofouling effects and a preparation method thereof are disclosed. The preparation method includes: dissolving a highly water-stable metal organic framework CuBTTri in an n-hexane solution containing trimesoyl chloride by ultrasonic wave, immersing a polyethersulfone ultrafiltration membrane in an aqueous solution of m-phenylene diamine and taking out, and then immersing the ultrafiltration membrane in the trimesoyl chloride-n-hexane solution containing the aforementioned metal organic framework for reaction and modification, so as to obtain the thin-film composite polyamide reverse osmosis membrane. The resulting composite reverse osmosis membrane integrated with the anti-bacterial metal organic framework CuBTTri has a high reverse osmosis membrane permeability and possesses greatly improved and persistent anti-bacterial and anti-biofouling properties. The preparation method is simple and conducive to promotion, and has mild conditions.