review · Environmental Nanotechnology Monitoring & Management
Membrane fouling presents a critical obstacle in water treatment operations, prompting substantial efforts to modify polymeric membrane surfaces using nanoparticles. While embedding nanoparticles can alleviate fouling, weak adhesion often leads to nanoparticle leaching. This release triggers secondary pollution, posing significant toxicological risks to aquatic ecosystems and downstream water consumers. Managing this risk requires an understanding of the thermodynamic interactions and underlying factors that control nanoparticle immobilisation within polymer matrices. Leaching not only creates ecotoxicological hazards but also deteriorates the physicochemical properties and long-term separation performance of the modified membranes. Addressing these issues demands advanced stabilisation methods to securely bind nanoparticles within the polymer structure, alongside continuous evaluation of their environmental safety and functional durability for sustainable water purification.
Using nanomaterials can make water filtration membranes more effective, but escaping particles can contaminate drinking water and harm aquatic environments. Understanding how nanoparticles detach from filters helps engineers design safer, more durable water treatment systems that clean water reliably without creating unexpected secondary pollution hazards for communities and surrounding ecosystems.
The findings inform membrane manufacturers and water treatment developers seeking to produce nanocomposite filtration systems. By highlighting stabilisation techniques to halt nanoparticle leaching, the evidence supports the design of safer, longer-lasting filtration products. As an assessment synthesising literature on binding stability and toxicity, the insights provide early-stage guidance rather than an immediately deployable commercial technology.
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Fouling remains a major challenge in membrane-based water treatment technologies. As a result, contemporary research is geared towards membrane surface modification techniques to reduce fouling. Mitigation strategies involving incorporation of nanoparticles (NPs) into polymeric membranes has gained a remarkable interest. However, NPs leach is eminent, particularly with poor support on membranes resulting in secondary pollution. Consequently, aquatic life is threatened depending on the level of toxicity of the leached NPS. Also, these NPs present toxicological effects to other water consumers. Therefore, this work reviews contemporary literature on membrane surface modification techniques paying attention to incorporation of NPs in the membrane polymer matrices. Various factors governing NPs leach are concisely presented. Special attention was focused on stability of the NPs immobilization on the polymeric membrane due to thermodynamic interactions. Similarly, the effects of NPs leach on membrane physicochemical properties and the NPS ecotoxicity are discussed in detail based on literature reports. Different approaches presenting improvement on NP stability in the polymer matrix are discussed. Lastly casting of future perspectives and the impact of NP leach on sustainable performance of the membranes and ecotoxicity is presented.
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DOI: 10.1016/j.enmm.2024.100984
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