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"Molecularly Imprinted Polymers for the Selective Capture of Environmental Phosphate"

"Molecularly Imprinted Polymers for the Selective Capture of Environmental Phosphate"

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JHU Applied Physics Laboratory JHU Applied Physics Laboratory Presentation Transcript

  • Tracy J. Terry, PhD JHUAPL Imprinted Chitosan for Nutrient Sequestration
  • Imprinted Chitosan Overview Use fishing industry by-products to treat agricultural waste!
  • Imprinted Chitosan Impact
    • Biocompatible
    • Biodegradable
    • Natural Starting Materials
    • Aqueous Material Processing
    • Recyclable as Fertilizer
  • Chitosan – EPA/FDA Approved Environmentally Safe and Biocompatible
    • Blood clotting agent in field bandages
    • Immune system enhancement in plants
    Used in Iraq and Afghanistan. Used to fight Pine Beetles infestations.
    • Effluent treatment at construction sites.
    • Fiber supplement used for weight loss.
    Chesapeake Bay Program
  • Imprinted Chitosan Imprinting Targets
    • Phosphate – fertilizer
      • Agricultural run-off
      • Nutrient feed for algal blooms
      • Leads to dead zones
    • Nitrate – fertilizer
      • Agricultural run-off
    • Nutrient feed for algal blooms
    • Leads to dead zones
    • Arsenite/Arsenate – antibiotic
      • Passed into chicken litter as water-soluble arsenite/arsenate
      • Leaches into watershed
      • Toxic to humans and animals
  • Imprinted Chitosan Methods for Use
    • In conjunction with Chicken Litter Fertilizer
        • Absorb excess phosphate and/or arsenic
        • Incorporate into chicken litter pellets
        • Apply to fields with chicken litter
    • Apply to existing wastewater
    • treatment facilities
    • Media Filters
    • Retention Ponds
    • Wetland Basins
    • Wetland Channels
    Photo by Stephen Ausmus. Science Daily Chesapeake Bay Program Chesapeake Bay Program
  • Imprinted Chitosan Imprinting Process Chitosan Chitosan Imprinted Chitosan Treat Waste Imprint Relax the Polymer Add Scaffolding Remove Imprint Recycle
  • Imprinted Chitosan Results
      • First Generation
      • Proof of concept achieved
      • Phosphate imprint
      • ~$8,000
      • Not yet optimized
    Phosphate Uptake of Phosphate Phosphate (wt %) pH = 4 pH = 7 pH = 8 Chitosan 1.61 0.47 0.15 Phosphate Imprinted Chitosan 2.00 0.79 0.46 % Improvement [(PIC-C)/C *100] 25 70 200
  • Imprinted Chitosan Future Work
      • Pursue funding
      • Obtain selectivity results
      • Optimize each step of the process.
      • pH of imprinting step
      • extent of cross-linking
      • Process the polymer into beads for enhanced filtration.
      • Modify Chitosan for other uses.
      • Nitrate Sequestration
      • Arsenite/Arsenate Sequestration
      • Hyperphosphaetemia Treatment
      • Metal Ion Sequestration
      • Size, Shape, and Charge differences should allow selectivity for imprinting different ions.
    Nitrate Phosphate Arsenite Arsenate
  • Imprinted Chitosan Contact Information Tracy J. Terry, PhD [email_address] Heather Curran [email_address] Acknowledgements: This work was supported by the Office of Technology Transfer and the Technical Services Department of JHUAPL.