jhu applied physics laboratory
DESCRIPTION
"Molecularly Imprinted Polymers for the Selective Capture of Environmental Phosphate"TRANSCRIPT
Tracy J. Terry, PhDJHUAPL
Imprinted Chitosanfor
Nutrient Sequestration
Imprinted ChitosanOverview
Use fishing industry by-products
to treat agricultural waste!
Imprinted ChitosanImpact
Biocompatible Biocompatible
BiodegradableBiodegradable
Natural Starting MaterialsNatural Starting Materials
Aqueous Material ProcessingAqueous Material Processing
Recyclable as FertilizerRecyclable as Fertilizer
Chitosan – EPA/FDA ApprovedEnvironmentally 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 ChitosanImprinting Targets
Phosphate – fertilizerAgricultural run-offNutrient feed for algal bloomsLeads to dead zones
Nitrate – fertilizerAgricultural run-off
Nutrient feed for algal bloomsLeads to dead zones
Arsenite/Arsenate – antibioticPassed into chicken litter as water-soluble arsenite/arsenateLeaches into watershed Toxic to humans and animals
Imprinted ChitosanMethods for Use
In conjunction with Chicken Litter Fertilizer Absorb excess phosphate and/or arsenicIncorporate into chicken litter pelletsApply to fields with chicken litter
Apply to existing wastewater treatment facilitiesMedia FiltersRetention Ponds Wetland Basins Wetland Channels
Photo by Stephen Ausmus. Science Daily
Chesapeake Bay Program
Chesapeake Bay Program
Imprinted ChitosanImprinting Process
ChitosanChitosan
Imprinted Chitosan
Treat Waste
Imprint
Relax the Polymer
Add Scaffolding
Remove ImprintRecycle
Imprinted Chitosan Results
First Generation
Proof of concept achieved
Phosphate imprint
~$8,000
Not yet optimized
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
Phosphate
Imprinted ChitosanFuture Work
Pursue funding
Obtain selectivity results
Optimize each step of the process.pH of imprinting stepextent of cross-linking
Process the polymer into beads for enhanced filtration.
Modify Chitosan for other uses.Nitrate SequestrationArsenite/Arsenate
SequestrationHyperphosphaetemia
TreatmentMetal Ion Sequestration
Size, Shape, and Charge differences should allow selectivity for imprinting different ions.
Nitrate PhosphateArsenite
Arsenate
Imprinted ChitosanContact Information
Tracy J. Terry, [email protected]
Heather [email protected]
Acknowledgements:This work was supported by the Office of Technology Transfer and the Technical Services Department of JHUAPL.