Surface engineered magnetic nanoparticles for removal of toxic metal ions and bacterial pathogens

► Removal of multiple toxic metal ions (Cr3+, Co2+, Ni2+, Cu2+, Cd2+, Pb2+ and As3+) and bacterial pathogens (E. coli) from water. ► Role of surface functionality (COOH, NH2 or SH) on adsorption mechanism of toxic metal ions. ► Field dependent magnetic responsivity and reusability of nanoadsorbents for water purification.