JHU Applied Physics Laboratory

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

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JHU Applied Physics Laboratory

  1. 1. Tracy J. Terry, PhD JHUAPL Imprinted Chitosan for Nutrient Sequestration
  2. 2. Imprinted Chitosan Overview Use fishing industry by-products to treat agricultural waste!
  3. 3. Imprinted Chitosan Impact <ul><li>Biocompatible </li></ul><ul><li>Biodegradable </li></ul><ul><li>Natural Starting Materials </li></ul><ul><li>Aqueous Material Processing </li></ul><ul><li>Recyclable as Fertilizer </li></ul>
  4. 4. Chitosan – EPA/FDA Approved Environmentally Safe and Biocompatible <ul><li>Blood clotting agent in field bandages </li></ul><ul><li>Immune system enhancement in plants </li></ul>Used in Iraq and Afghanistan. Used to fight Pine Beetles infestations. <ul><li>Effluent treatment at construction sites. </li></ul><ul><li>Fiber supplement used for weight loss. </li></ul>Chesapeake Bay Program
  5. 5. Imprinted Chitosan Imprinting Targets <ul><li>Phosphate – fertilizer </li></ul><ul><ul><li>Agricultural run-off </li></ul></ul><ul><ul><li>Nutrient feed for algal blooms </li></ul></ul><ul><ul><li>Leads to dead zones </li></ul></ul><ul><li>Nitrate – fertilizer </li></ul><ul><ul><li>Agricultural run-off </li></ul></ul><ul><li>Nutrient feed for algal blooms </li></ul><ul><li>Leads to dead zones </li></ul><ul><li>Arsenite/Arsenate – antibiotic </li></ul><ul><ul><li>Passed into chicken litter as water-soluble arsenite/arsenate </li></ul></ul><ul><ul><li>Leaches into watershed </li></ul></ul><ul><ul><li>Toxic to humans and animals </li></ul></ul>
  6. 6. Imprinted Chitosan Methods for Use <ul><li>In conjunction with Chicken Litter Fertilizer </li></ul><ul><ul><ul><li>Absorb excess phosphate and/or arsenic </li></ul></ul></ul><ul><ul><ul><li>Incorporate into chicken litter pellets </li></ul></ul></ul><ul><ul><ul><li>Apply to fields with chicken litter </li></ul></ul></ul><ul><li>Apply to existing wastewater </li></ul><ul><li>treatment facilities </li></ul><ul><li>Media Filters </li></ul><ul><li>Retention Ponds </li></ul><ul><li>Wetland Basins </li></ul><ul><li>Wetland Channels </li></ul>Photo by Stephen Ausmus. Science Daily Chesapeake Bay Program Chesapeake Bay Program
  7. 7. Imprinted Chitosan Imprinting Process Chitosan Chitosan Imprinted Chitosan Treat Waste Imprint Relax the Polymer Add Scaffolding Remove Imprint Recycle
  8. 8. Imprinted Chitosan Results <ul><ul><li>First Generation </li></ul></ul><ul><ul><li>Proof of concept achieved </li></ul></ul><ul><ul><li>Phosphate imprint </li></ul></ul><ul><ul><li>~$8,000 </li></ul></ul><ul><ul><li>Not yet optimized </li></ul></ul>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
  9. 9. Imprinted Chitosan Future Work <ul><ul><li>Pursue funding </li></ul></ul><ul><ul><li>Obtain selectivity results </li></ul></ul><ul><ul><li>Optimize each step of the process. </li></ul></ul><ul><ul><li>pH of imprinting step </li></ul></ul><ul><ul><li>extent of cross-linking </li></ul></ul><ul><ul><li>Process the polymer into beads for enhanced filtration. </li></ul></ul><ul><ul><li>Modify Chitosan for other uses. </li></ul></ul><ul><ul><li>Nitrate Sequestration </li></ul></ul><ul><ul><li>Arsenite/Arsenate Sequestration </li></ul></ul><ul><ul><li>Hyperphosphaetemia Treatment </li></ul></ul><ul><ul><li>Metal Ion Sequestration </li></ul></ul><ul><ul><li>Size, Shape, and Charge differences should allow selectivity for imprinting different ions. </li></ul></ul>Nitrate Phosphate Arsenite Arsenate
  10. 10. 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.

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