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Published on: February 13, 2016
Toward Scalability: Fe-MOF-Based Ultrafiltration Membrane for Effective Microplastics Removal from Drinking Water at
Sahil Shrestha1, Ajaya Subedi1, Shane A Snyder2,3
1Environmental Engineering Program Department of Civil Engineering Pulchowk Campus Institute of Engineering Tribhuvan University Pulchowk, Lalitpur Nepal.
Abstract:
The frequent detection of microplastics (MPs) in bottled drinking water underscores the need for effective point-of-use (POU) purification strategies to limit human exposure, particularly given their ability to transport co-contaminants. While metal-organic frameworks (MOFs) have been extensively investigated for MP removal, their application in practical POU drinking water purification remains largely underexplored, especially regarding scalability and delivery of potable water after filtration. In this work, NH2-MIL-101(Fe) MOF is integrated onto a commercial polyvinylidene fluoride (PVDF) ultrafiltration (UF) membrane to develop a Fe-MOF@UF composite for enhanced removal of polyethylene terephthalate (PET)-MP from drinking water. The optimally synthesized Fe-MOF@UF membrane achieved a PET-MP rejection efficacy of ∼94%. Additionally, its practical applicability is validated using commercially available PET-bottled drinking water, confirming the effective removal of MPs while delivering potable water compliant with international drinking water quality standards. Collectively, these outcomes emphasize the first practical viability of MOF-membrane hybrids for POU drinking water treatment. Despite limitations, this research lays a strong groundwork for future efforts toward performance optimization and highlights a viable pathway for scalable, cost-effective, and sustainable MOF-incorporated household MP filtration units.
Insights
This study developed a novel composite membrane using metal-organic frameworks (MOFs) to effectively remove microplastics (MPs) from bottled water at the point-of-use. The new Fe-MOF@UF membrane successfully filtered polyethylene terephthalate microplastics, ensuring safe drinking water.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment
Background:
- Microplastics (MPs) are frequently found in bottled water, posing risks due to potential co-contaminant transport.
- Existing metal-organic frameworks (MOFs) for MP removal lack practical application in point-of-use (POU) drinking water systems, especially concerning scalability and water delivery.
- Polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes are used for water purification but require enhancement for effective microplastic removal.
Purpose of the Study:
- To develop and evaluate a novel Fe-MOF@UF composite membrane for enhanced removal of polyethylene terephthalate (PET)-MPs from drinking water at the point-of-use.
- To assess the practical applicability and performance of the Fe-MOF@UF membrane in filtering commercially available bottled water.
- To demonstrate the potential of MOF-membrane hybrids as a scalable and cost-effective solution for household microplastic filtration.
Main Methods:
- Synthesis of NH2-MIL-101(Fe) metal-organic framework (MOF).
- Integration of the synthesized Fe-MOF onto a commercial polyvinylidene fluoride (PVDF) ultrafiltration (UF) membrane to create a Fe-MOF@UF composite.
- Characterization of the composite membrane's performance in rejecting polyethylene terephthalate (PET) microplastics from drinking water.
- Validation of the membrane's efficacy using commercially available PET-bottled drinking water and assessment of water quality compliance.
Main Results:
- The optimally synthesized Fe-MOF@UF composite membrane achieved approximately 94% rejection efficacy for PET-MPs.
- Practical application tests confirmed effective MP removal from commercial PET-bottled drinking water.
- The treated water met international drinking water quality standards, indicating safe potable water delivery.
- The Fe-MOF@UF membrane demonstrated practical viability for point-of-use drinking water treatment.
Conclusions:
- The developed Fe-MOF@UF composite membrane represents a significant advancement in point-of-use microplastic removal from drinking water.
- This study highlights the first practical viability of MOF-membrane hybrids for treating microplastic-contaminated drinking water.
- The research provides a strong foundation for future optimization and scalable, cost-effective household MP filtration units.
- MOF-incorporated membranes offer a promising pathway for sustainable microplastic mitigation in drinking water.
