Batch adsorption study of microplastic removal using synthesized nickel-ferrite nanoparticles

Abstract This study presents the utilization of nanoparticles to remove microplastics from wastewater. Nickel-ferrite nanoparticles (NFNs) within the 65–81 nm size range were synthesized via the co-precipitation method at 70 ± 5 °C, followed by calcination within 300–550 °C. The resulting product underwent demagnetization, rendering it non-magnetic. Without a magnetic field, NF nanoparticles exhibited coagulant behavior, freely diffusing in solutions and subsequently facilitating microplastic removal. Leveraging their coagulant properties, these nanoparticles acted as nano-coagulants, effectively eliminating organic, inorganic, and microplastic contaminants from wastewater. This process yielded crystalline structured particles possessing ferromagnetic characteristics. Sorption parameters, including pH, dosage, and contact time, were assessed to optimize removal efficiency. The results indicated successful adhesion of microplastics to the nanocomposite surface, resulting in their removal from the water matrix. Demagnetized NFNs demonstrated noteworthy 90.4% microplastic removal efficiency under optimized conditions (pH 3, contact time of 90 min, and dosage of 30–40 mg). Experimental variables such as dosage, temperature, pH, and contact time were systematically evaluated to determine the efficacy of demagnetized nanomaterial under optimal conditions for each parameter. The primary objective of this investigation is to propose an application utilizing magnetic oxide-chemical nanoparticles for water and wastewater treatment aimed at enhancing water quality by reducing pollutant levels in compliance with national and international water quality standards.