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Lydia SannellaCollege of Marin, ChemistryMentors: Kristin Clark & Reginald ThioAdvisor: Dr. Arturo KellerBren School of Environmental Science and ManagementFunding: National Science Foundation, Environmental ProtectionAgency, Toxic Substances Research & Training Program


Lydia SannellaCollege of Marin, ChemistryMentors: Kristin Clark & Reginald ThioAdvisor: Dr. Arturo KellerBren School of Environmental Science and ManagementFunding: National Science Foundation, Environmental ProtectionAgency, Toxic Substances Research & Training Program


Lydia SannellaCollege of Marin, ChemistryMentors: Kristin Clark & Reginald ThioAdvisor: Dr. Arturo KellerBren School of Environmental Science and ManagementFunding: National Science Foundation, Environmental ProtectionAgency, Toxic Substances Research & Training Program


Cast of CharactersThe Pollutants: Persistent Organic Pollutants (POPs)‐ Include pesticides and byproducts of industry‐ Stay in the environment‐ Harmful to human healthThe Sorbents:Activated Carbon‐The most common sorbent‐Requires q water to be pumped pand treated offsite‐Reusing it has a high energy costMagnetic Permanently ConfinedMicelle Arrays‐Nano‐iron Sorbent‐Can be used on‐site‐Most of the POP can berecovered after treatment‐Reusable


Research Goals‐ Synthesize iron nanoparticles called magnetic PermanentlyConfined Micelle Arrays (magPCMA).‐ Test magPCMA with different POPs and study its effectiveness asa sorbent compared with the common commercial sorbentactivated carbon.‐2 classes of pollutants studied:‐Polycyclic Aromatic Hydrocarbons (PAHs)‐Chlorinated Hydrocarbons‐‐pesticidesMagPCMAActivated Carbon(Image from metalclay.com)


(Adapted from waterprofessionals.com)(Adapted from Wang et al)


Research MethodsStep 1: Synthesize magPCMAStep 2: Dose samples of magPCMA and activated carbon with ihPOPs and allowto mix for 24 hoursStep 3: Use absorption spectrophotometry, GC‐MS,and HPLC to determine how much pollutant wassorbedStep 4: Run magnetic recovery and reusabilityexperiments


% PAH Sorbed in 24 HoursMagPCMA vs. Activated Carbon10080604020%0 % Naphthalene Acenaphthene Phenanthrene Pyrene


% Chlorinated Hydrocarbon Sorbedin 24 Hours10080604020%MagPCMA vs. Activated Carbon0%Atrazine Diuron Lindane


Summary‐Activated carbon is initially more effective at removing POPs fromsolution than MagPCMA.‐Activated carbon is cheaper and simpler to produceHowever:‐MagPCMA can be used on‐site and removed magnetically‐Activated Ati tdcarbon used in this study wasof very high quality‐In I an acetone extraction, ti 83.6% of acenaphthenecould be removed from MagPCMA‐ Preliminary data shows that MagPCMA canbe reused multiple times(Image from cameroncarbon.com)


The Keller LabMentors: Kristin Clark & Reginald ThioPI: Dr. Arturo KellerLab Partners: Colin Van‐Zandt, Marc Stefanuto,Annabelle LeeINSETJens‐Uwe Kuhn, Nick Arnold, Arica LubinFamily, Friends, and Instructors


Questions?


Physical Properties of Some HOCsCompoundType Compound Structure Molar Mass (g/mol)Solubility inH₂O (mg/L)K owPolycy clic Aromat ticHydrocarbonsAcenaphthene 154.211 4 8317.6Naphthalene 128.171 31.9 3235.9Phenanthrene 178.233 1.28 28840.3Pyrene 202.255 0.135 61659.5Pestic cidesAtrazine 215.686 33.0 478.6Diuron 233.097 42 263.0Lindane 290.832 7.30 5754.4


%%100Correlations (or lack thereof) Between Some PhysicalProperties of POPs and % SorbedK ow vs. % Sorbed by MagPCMAS80oS 1006080ro4060b r4020% eb 20d 0e 00 20000 40000 60000 80000 dK owK ow vs. % Sorbed by ActivatedCarbon100S 100S8080oor 6060rb40% 4020be 200ed0 20000 40000 60000 80000d 0K ow`Molar Mass vs. % Sorbed byMagPCMA0 100 200 300 400Molar Mass (g/mol)Molar Mass vs. % Sorbed MagPCMA0 100 200 300 400Molar Mass (g/mol)


Regeneration of Activated Carbon‐Requires an expensive, 3‐step process that uses heat to desorborganics‐Up U to 900°C‐Process is too expensive for smaller treatment sites, so they shipactivated carbon in and out


Health Effects of PAHs andChlorinated HydrocarbonsPAHs‐Long‐term exposure of PAHs showed anincrease in cancer in mice.‐Exposure to PAHs has shown to effectthe reproductive health of laboratorymice.‐Other effects may include liver andkidney damage, cataracts, and jaundice.Chlorinated Hydrocarbons‐ Many of these are specifically used aspoison (i.e. incecticides, herbicides, androdenticides)‐ Acutely toxic (adverse effects take placeafter a single dose)‐ Carcinogenic(Illinois Department of Public Health)(Columbia Environmental Research Center)

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