Magnetic Active Water Filter Membrane for Induced Heating to Remove Biofoulants.

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  • Additional Information
    • Source:
      Publisher: American Chemical Society Country of Publication: United States NLM ID: 101504991 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1944-8252 (Electronic) Linking ISSN: 19448244 NLM ISO Abbreviation: ACS Appl Mater Interfaces Subsets: MEDLINE
    • Publication Information:
      Original Publication: Washington, D.C. : American Chemical Society
    • Subject Terms:
      Filtration/*methods ; Lakes/*chemistry ; Magnetics/*methods ; Water Pollutants/*chemistry ; Water Purification/*instrumentation; Bacteria/growth & development ; Bacteria/isolation & purification ; Biofouling/prevention & control ; Filtration/instrumentation ; Hot Temperature ; Lakes/microbiology ; Magnetics/instrumentation ; Membranes, Artificial ; Water Purification/methods
    • Abstract:
      Filter membrane processes are water purification methods that use a partially permeable membrane to separate contaminants from drinking water and wastewater. Although highly effective, they suffer from biofouling due to the aggregation of bacteria and contaminants from the filtrate, thus rendering the membrane unusable. Consequently, the membrane needs to be replaced on a regular basis, which interrupts filtration operation, reduces throughput, and increases production cost. To address this issue, we have developed a new method to remove biofoulants via induction heating on a modified membrane with magnetite (Fe 3 O 4 ) magnetic nanoparticles (MNPs) coating. Under applied alternating magnetic field (AMF), the surface temperature of the MNPs coating reaches 180 °C with a heating rate of 1.03 °C/s, which disintegrates biofoulants generated by model bacteria ( Bacillus subtilis ) and by those present in environmental water samples collected from a local lake. The heating process is capable of cleaning biofoulants for several cycles without damaging the filtration function of the membrane. Furthermore, magnetic induction heating on the modified membrane allows uniform high-intensity heat generation on a large surface in only a few minutes using inexpensive MNPs, which can potentially be scaled up for industrial applications.
    • Contributed Indexing:
      Keywords: bacteria deactivation; biofoulants; induction heating; magnetic nanoparticles; membrane filtration
    • Accession Number:
      0 (Membranes, Artificial)
      0 (Water Pollutants)
    • Publication Date:
      Date Created: 20200117 Date Completed: 20201211 Latest Revision: 20201214
    • Publication Date:
      20221213
    • Accession Number:
      10.1021/acsami.9b19641
    • Accession Number:
      31944649