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Successive removal of E. coli and a mixture of Pb2+ and malachite green from water via magnetic iron oxide/phosphate nanocomposites
- Zhang, Fan, Wu, Zhaozhao, Huang, Yuxiong, Keller, Arturo A.
- Colloids and surfaces 2019 v.578 pp. 123598
- Escherichia coli, disinfection, hot water treatment, iron oxides, lead, magnetic materials, magnetism, malachite green, nanocomposites, phosphates, pollutants, synergism, water treatment
- Three magnetic iron oxide/phosphate nanocomposites, Fe₃O₄/Ba₃(PO₄)₂, Fe₃O₄/Sr₅(PO₄)₃(OH), and Fe₃O₄/Sr₅ₓBa₃ₓ(PO₄)₃(OH) (denominated FB, FS, and FSB, respectively) were prepared by one-pot hydrothermal method. They exhibited a removal efficiency of 96%, 86%, and 91% for Escherichia coli (E. coli) of 5 × 10⁸ CFU/mL within 30 min, respectively. After bacterial removal, the recovered nano-composites by a magnet were reused to treat a mixed solution of Pb²⁺ and malachite green (MG). The loaded E. coli on the surface of the nanocomposites is beneficial to the subsequent removal of positively charged Pb²⁺ and MG. On the other hand, the MG in the mixture can contribute substantially to the disinfection of the recovered nanocomposites. These nano-composites are sustainable materials for the successive removal of E. coli and mixed cationic pollutants from water. Removal process by these nano-composites possesses a synergistic effect, leading to more effective water treatment.