Magnetic polyresorcinol@CoFe₂O₄@MnS nanoparticles for adsorption of Pb(II), Ag(I), Cr(VI) and bacteria from water solution

This study devoted to developing an efficient adsorbent with the excellent adsorption performance of heavy metals and bacteria capturing. Polyresorcinol@CoFe₂O₄ was synthesized by one-step hydrothermal reaction followed with doping MnS nanoparticles. The composite was characterized with SEM, TEM, BET, EDX, XRD, zeta potential measurement and Raman spectroscopy. Optimization of effective parameters on heavy metal adsorption, i.e., pH, contact time and adsorbent dosage, was performed with response surface methodology using Box-Behnken design. The sorbent showed good performance for Pb(II), Ag(I) and Cr(VI) removal with convenient magnetic separation operation with an adsorption capacity of 201.2, 118.8 and 46.01 mg g^-1, respectively. Results of bacteria capturing showed that using 20 mg of the nanocomposite, more than 98% of bacteria (initial concentration of 1.5 × 10⁸ CFU g^-1) can be removed from solution within 10 min.