Lydia Sannella Lydia Sannella C ll C ll College of Marin, Chemistry College of Marin, Chemistry f M f M i i Ch Ch i t i t Mentors: Kristin Clark & Reginald Mentors: Kristin Clark & Reginald Thio Thio Advisor: Dr. Arturo Keller Advisor: Dr. Arturo Keller Bren School of Environmental Science and Management Bren School of Environmental Science and Management Bren School of Environmental Science and Management Bren School of Environmental Science and Management Funding: National Science Foundation, Environmental Protection Funding: National Science Foundation, Environmental Protection Agency, Toxic Substances Research & Training Program Agency, Toxic Substances Research & Training Program g g y, y, g g g g
Lydia Sannella Lydia Sannella C ll C ll College of Marin, Chemistry College of Marin, Chemistry f M f M i i Ch Ch i t i t Mentors: Kristin Clark & Reginald Mentors: Kristin Clark & Reginald Thio Thio Advisor: Dr. Arturo Keller Advisor: Dr. Arturo Keller Bren School of Environmental Science and Management Bren School of Environmental Science and Management Bren School of Environmental Science and Management Bren School of Environmental Science and Management Funding: National Science Foundation, Environmental Protection Funding: National Science Foundation, Environmental Protection Agency, Toxic Substances Research & Training Program Agency, Toxic Substances Research & Training Program g g y, y, g g g g
Lydia Sannella Lydia Sannella C ll C ll College of Marin, Chemistry College of Marin, Chemistry f M f M i i Ch Ch i t i t Mentors: Kristin Clark & Reginald Mentors: Kristin Clark & Reginald Thio Thio Advisor: Dr. Arturo Keller Advisor: Dr. Arturo Keller Bren School of Environmental Science and Management Bren School of Environmental Science and Management Bren School of Environmental Science and Management Bren School of Environmental Science and Management Funding: National Science Foundation, Environmental Protection Funding: National Science Foundation, Environmental Protection Agency, Toxic Substances Research & Training Program Agency, Toxic Substances Research & Training Program g g y, y, g g g g
Cast of Characters Cast of Characters The Pollutants: Persistent Organic Pollutants (POPs) ‐ Include pesticides and byproducts of industry ‐ Stay in the environment ‐ Harmful to human health Harmful to human health The Sorbents: Activated Carbon Magnetic Permanently Confined ‐ The most common sorbent Micelle Arrays ‐ Requires water to be pumped q p p ‐ Nano ‐ iron Sorbent and treated offsite ‐ Can be used on ‐ site ‐ Reusing it has a high energy cost ‐ Most of the POP can be recovered after treatment ‐ Reusable
Research Goals Research Goals ‐ Synthesize iron nanoparticles called magnetic Permanently Confined Micelle Arrays (magPCMA) Confined Micelle Arrays (magPCMA). ‐ Test magPCMA with different POPs and study its effectiveness as a sorbent compared with the common commercial sorbent activated carbon. i d b ‐ 2 classes of pollutants studied: ‐ Polycyclic Aromatic Hydrocarbons (PAHs) ‐ Chlorinated Hydrocarbons ‐‐ pesticides MagPCMA Activated Carbon (Image from metalclay.com)
(Adapted from waterprofessionals.com) (Adapted from Wang et al)
Research Methods Research Methods Step 1: Synthesize magPCMA Step 2: Dose samples of magPCMA and activated carbon with POPs and allow S 2 D l f PCMA d i d b i h POP d ll to mix for 24 hours Step 3: Use absorption spectrophotometry, GC ‐ MS, and HPLC to determine how much pollutant was d d h h ll sorbed Step 4: Run magnetic recovery and reusability experiments
% PAH Sorbed in 24 Hours % PAH Sorbed in 24 Hours MagPCMA vs. Activated Carbon 100 % 80 60 40 20 0 % Naphthalene Acenaphthene Pyrene Phenanthrene
% Chlorinated Hydrocarbon Sorbed % Chlorinated Hydrocarbon Sorbed in 24 Hours MagPCMA vs. Activated Carbon MagPCMA vs Activated Carbon 100 % 80 8 60 40 20 20 0 % Lindane Atrazine Diuron
Summary Summary ‐ Activated carbon is initially more effective at removing POPs from solution than MagPCMA. l i h M PCMA ‐ Activated carbon is cheaper and simpler to produce However: ‐ MagPCMA can be used on ‐ site and removed magnetically ‐ Activated carbon used in this study was A ti t d b d i thi t d of very high quality ‐ In an acetone extraction, 83.6% of acenaphthene I t t ti 83 6% f hth could be removed from MagPCMA ‐ Preliminary data shows that MagPCMA can Preliminary data shows that MagPCMA can be reused multiple times (Image from cameroncarbon.com)
The Keller Lab Mentors: Kristin Clark & Reginald Thio PI: Dr. Arturo Keller Lab Partners: Colin Van ‐ Zandt, Marc Stefanuto, Annabelle Lee INSET Jens ‐ Uwe Kuhn Nick Arnold Arica Lubin Jens ‐ Uwe Kuhn, Nick Arnold, Arica Lubin Family, Friends, and Instructors
Questions? Questions?
Physical Properties of Some HOCs Physical Properties of Some HOCs Compound Solubility in Type Compound Structure Molar Mass (g/mol) H ₂ O (mg/L) K ow tic ns clic Aromat Hydrocarbo Acenaphthene 154.211 4 8317.6 Naphthalene 128.171 31.9 3235.9 H Polycy Phenanthrene 178.233 1.28 28840.3 Pyrene 202.255 0.135 61659.5 cides Atrazine Atrazine 215 686 215.686 33 0 33.0 478 6 478.6 Pestic Diuron 233.097 42 263.0 Lindane 290.832 7.30 5754.4
Correlations (or lack thereof) Between Some Physical ( ) y Properties of POPs and % Sorbed K ow vs. % Sorbed by MagPCMA Molar Mass vs. % Sorbed by ` 100 MagPCMA MagPCMA S 80 100 S o 60 80 o r 60 % 40 r b 4 40 % % b 20 e 20 0 e 0 d d 0 20000 40000 60000 80000 0 100 200 300 400 K ow Molar Mass (g/mol) Molar Mass (g/mol) K ow vs. % Sorbed by Activated Molar Mass vs. % Sorbed MagPCMA Carbon 100 S 100 S 80 80 80 8 o o 60 60 r r % 40 % 40 b b 20 20 e e 0 0 d 0 d 0 20000 40000 60000 80000 0 100 200 300 400 K ow Molar Mass (g/mol )
Regeneration of Activated Carbon ‐ Requires an expensive, 3 ‐ step process that uses heat to desorb organics ‐ Up to 900°C U 900°C ‐ Process is too expensive for smaller treatment sites, so they ship activated carbon in and out
Health Effects of PAHs and Health Effects of PAHs and Chlorinated Hydrocarbons PAHs Chlorinated Hydrocarbons ‐ Long ‐ term exposure of PAHs showed an ‐ Many of these are specifically used as poison (i.e. incecticides, herbicides, and increase in cancer in mice. rodenticides) ‐ Exposure to PAHs has shown to effect ‐ Acutely toxic (adverse effects take place the reproductive health of laboratory after a single dose) mice. ‐ Carcinogenic ‐ Other effects may include liver and kidney damage, cataracts, and jaundice. (Illinois Department of Public Health) (Columbia Environmental Research Center)
Recommend
More recommend
