Abstract
AgO-Fe3O4 hybrid is a promising bactericidal agent for water purification, because of its strong antimicrobial activity and magnetically recoverable performance. However, the complicated preparing process, raw materials waste and milling medium contamination of AgO-Fe3O4 hybrids have limited its practical application. In this paper, Fe3O4/AgO nanocomposite synthesized via a simple chemical oxidation method was investigated. The nanocomposite with 35.0 wt% AgO content was composed of monoclinic AgO and cubic Fe3O4. The nanocomposite exhibited strong antimicrobial properties, superparamagnetic behavior, good magnetically recoverable performance and bactericidal stability. When the concentration was 20 mg.L−1, more than 98.5% of S. aureus or E. coli was killed in 25 min. Further increasing the concentration to 5000 mg.L−1, all of the two bacteria were killed in 25 min. Finally, based on present investigation, a plausible bactericidal mode of action for the nanocomposite against S. aureus and E. coli was proposed.
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