Prussian blue-encapsulated Fe 3 O 4 nanoparticles for reusable photothermal sterilization of water

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  • Tingting Jiang, Harbin Institute of Technology
  • ,
  • Yuanlin Wang, Harbin Institute of Technology
  • ,
  • Zhenglin Li, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology
  • ,
  • Hüsnü Aslan
  • Lei Sun, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology
  • ,
  • Ye Sun, Condensed Matter Science and Technology Institute and Department of Physics, Harbin Institute of Technology
  • ,
  • Wei Wang, Harbin Institute of Technology
  • ,
  • Miao Yu, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology

Waterborne health issues continue to grow despite the large number of available solutions. Current sterilization techniques to fight with waterborne diseases struggle to meet the demands on cost, efficiency and reach. Effective alternatives are pressingly required. Here we introduce Prussian blue coated ferroferric oxide (Fe 3 O 4 @PB) composites for water sterilization. The composites exhibit superior photothermal inactivation of bacteria under solar-light irradiation, with nearly complete inactivation of bacterial cells in only 15 min. Even for the mixed bacteria in authentic water matrices, the composites show excellent bacterial inactivation performance. Moreover, the highly magnetized iron core of the Fe 3 O 4 @PB enables magnetic separation and recycling. Multiple cycle runs reveal that Fe 3 O 4 @PB composites have exceptional stability and reusability. This work demonstrates a scalable, low-cost, high-efficiency and reusable sterilization method to improve water quality and safety.

Original languageEnglish
JournalJournal of Colloid and Interface Science
Volume540
Pages (from-to)354-361
Number of pages8
ISSN0021-9797
DOIs
Publication statusPublished - 2019

    Research areas

  • Photothermal sterilization, Prussian blue, Recyclability, Solar-light irradiation, Water security

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