Smart nanomaterials for clean water and a comprehensive exploration of the potentials of metal oxide nanoparticles in environmental remediation

Abstract Nanotechnology is promising for water filtration and decontamination, eliminating contaminants and pathogens from wastewater with exceptional efficiency. Nanomaterials like metal oxide nanoparticles (MONPs) have received attention for their extraordinary characteristics and versatility in tackling environmental issues. Metal oxides are attractive wastewater treatment materials due to their various physicochemical features. Metal oxide nanoparticles have great promise, but few review studies have examined their relevance in this field. Thus, our understanding of the extensive range of metal oxide nanoparticles and their water filtration applications is poor. A comprehensive investigation of metal oxide nanoparticles that reduce water contamination is the goal of this review paper. MONPs can remove organic and inorganic chemicals, heavy metals, pesticides, and wastewater dyes like azo-dyes. MONPs’ dynamic physiochemical properties high surface-to-volume ratio and low concentration efficacy make them effective wastewater treatment agents. These features help MONPs absorb and breakdown contaminants, improving water treatment. This extensive review examines five metal oxide nanoparticles, as well as their antibacterial and wastewater treatment uses. Titanium dioxide (TiO 2 ), zinc oxide (ZnO), iron oxide (Fe 2 O 3 ), copper oxide (CuO), and manganese oxide (MnO 2 ) prove their environmental flexibility and performance. Due to their photocatalytic activity, TiO 2 nanoparticles degrade organic contaminants and inactivate germs under UV light. ZnO nanoparticles have the ability to adsorb and photocatalyze heavy metals and organic contaminants from wastewater, making them powerful antimicrobials. Fe 2 O 3 nanoparticles can separate from treated water due to their magnetic characteristics. CuO nanoparticles also adsorb organic dyes and heavy metals, making them useful in wastewater cleanup. Finally, MnO 2 nanoparticles have excellent oxidizing characteristics, decomposing organic pollutants and reducing water toxins. Their capacity to catalyze redox reactions makes them essential in water treatment, especially for pollution removal. MONPs, especially in wastewater treatment, have great potential to reduce worldwide water pollution. By using metal oxide nanoparticles, we can improve water purification efficiency and sustainability, preserving our precious water resources and public health.