Innovations in nanomaterial-embedded polymer membranes for water and wastewater treatment: a comprehensive review

There has been growing interest in advancing nanoparticle-embedded polymeric membranes and their significant utilization in wastewater treatment to address the global water pollution problem. Incorporation of nanomaterials into the membrane matrices not only enhances the physicochemical properties like hydrophilicity, mechanical and thermal stability, porosity, antifouling, and antibacterial properties of the polymers but also influences the membrane permeability, selectivity, and several contaminant removals. This overview highlighted the development of nanomaterials like metal/metal oxide nanoparticles (0D), carbon nanotubes (1D), graphene or graphene oxide (GO) (2D layer materials), zwitterionic, zeolites, and associated structures (3D) blended with significant polymeric materials, along with synthesis and integration techniques for fabricating mixed-matrix nanoparticle-embedded polymer nanocomposite (PNC) membranes. This article also addresses the limitations of conventional water treatment technologies, recent challenges of polymer membrane technology, environmental impact, human considerations, and the prospects of these advanced nanoparticle-embedded polymer membranes for sustainable water and wastewater treatment. The motivation for future research in polymeric materials with embedded nanoparticles and the prediction of novel membranes for water purification will also be provided.