N-Functionalized Carbon Nanotubes As a Source and Precursor of <i>N</i>-Nitrosodimethylamine: Implications for Environmental Fate, Transport, and Toxicity

Verdugo, Edgard M.; Krause, Caitlin; Genskow, Kelly; Han, Ying; Baltrušaitis, Jonas; Mattes, Timothy E.; Valentine, Richard L.; Cwiertny, David M.

doi:10.1021/es501578u

Cited by 27 publications

(21 citation statements)

References 48 publications

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“…with ozone (rather than indirect oxidation processes involving hydroxyl radical). [147][148] Ozone stock solutions were prepared by bubbling an ozone/oxygen gas mixture generated by an LG-7 ozone generator into a flask of 5 mM phosphate buffer solution COSY was used to identify proton spin-systems. The procedure began with a well-shimmed proton spectrum that was obtained after carefully tuning the probe.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Identification of bioactive products from environmental transformation of steroids

Pflug¹

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am especially thankful for all of Andrew's help with experiments while I was busy writing this thesis, I couldn't have done it without you buddy. I am grateful for Dr. Daniel Schlenk and Dr. Allison Kupsco of the University of California, Riverside for help with glucocorticoid bioassays. Thank you to Dr. Kristine Wammer and Dr. Dalma Martinović of the University of St. Thomas Minnesota for their help with dienogest and trendione photolysis, nuclear hormone bioassays, and manuscript preparation. Kris, it was a true pleasure to collaborate with you. I would also like to thank Dr. Ed Kolodziej of the University of Washington for his help with manuscript editing and environmental occurrence studies. I am also grateful for Dr. Eric Patterson of Stony Brook University for his help with computational studies and fruitful discussions. I would like to thank the UI, the UI Chemistry Department, and the UI Department of Civil and Environmental Engineering for giving me the opportunity to work and study here. Support from the UI Graduate College and the National Science Foundation are gratefully acknowledged. I am extremely thankful for all of my family and friends for their love and support. Tania, you have been one of my best friends (gal pal, haha) for almost eight years now. Thank you for allowing me to be myself-quirks, flaws, and all. Thank you for your patience, acceptance, devotion, and unconditional love. I am so proud to call you my wife and I am excited for our next big adventure together. There is no one I would rather walk this path alongside. I love you. I would also like to thank my cousin Benjamin for v everything. You have been one of my best friends since we were little kids. I will never forget the fun times we have had along the way, shooting guns, playing music, going to concerts, hunting, fishing, camping, and just hanging out. You have made my life much more enjoyable and helped to keep me sane while working toward my PhD. I would like to thank the best siblings on the planet, my sister Vanessa and brother Brandon for their love and support. I am so proud of the young adults you have become, you are both so incredibly talented and two of the most genuine, caring, and loving persons I have ever met. Finally, I would like to thank my parents Matt and Sandra. Words cannot come close to expressing what you mean to me. My path up to this point has encountered many twists, turns, bumps, and obstacles and you have never once doubted or lost faith in me. You have shown me unconditional love and support; I am forever grateful for you. You have shown and taught me the definition of true love and you are the perfect example of a role model; there is no one I look up to more than you. I will love you always and I dedicate this to you.

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Section: Environmental Implicationsmentioning

confidence: 99%

Identification of bioactive products from environmental transformation of steroids

Pflug¹

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“…The surface-chemical composition of Au/TiO2 nanofibers reacted in UIWTP sedimentation basin effluent was investigated using a custom-designed Kratos Axis Ultra X-ray photoelectron spectroscopy (XPS) system equipped with a monochromatic Al Kα X-ray source. An extensive description of this system can be found elsewhere [138,139].…”

Section: Details Of Photocatalyst Materials and Optical Characterizationmentioning

confidence: 99%

Development of chemically active metal oxide composite nanofiber filters for water treatment

Greenstein¹

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My friends and family, for supporting me throughout the tricky journey that is graduate school. Mom and Dad, thank you for always pushing me to keep going (and for the extra emotional support during the last month of writing my dissertation). Ann, thank you for always being "Ann." Edgard Verdugo, my husband and best friend. Thank you for your unconditional love and endless assistance. You made this experience exceed my wildest dreams.

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“…An extensive description of this system can be found elsewhere. 283,284 To assess the relative availability of Fh in composites, the rate of soluble iron dissolution from Fh-containing nanofibers was measured in dilute sulfuric acid (0.1 M H2SO4; 0.125 g/L mat). Dissolution reactors were well-mixed on a rotator (Cole-Palmer…”

Section: Nanofiber Characterizationmentioning

confidence: 99%

“…An extensive description of this system can be found elsewhere. 283,284 Surface Fe concentrations measured via XPS are likely an average across several nanofibers, as the area of the XPS analysis is on the order of ~10 µm, while nanofiber diameters are on the order of ~100 nm. After sorption of lead, copper, and cadmium (10 mg/L initial concentrations; pH 6 for Cu and Pb; pH 7 for Cd) on rinsed Fe2-SDS1 composites, composites were air-dried at room temperature and analyzed via both XPS (survey scans and Pb 4f, Cu 2p, or Cd 3d regions) and X-ray diffraction (XRD; Rigaku MiniFlex II, cobalt X-ray source).…”

Section: Nanofiber Characterizationmentioning

confidence: 99%

Development of electrospun nanofiber composites for point-of-use water treatment

Peter¹

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A range of chemical pollutants now contaminate drinking water sources and present a public health concern, including organic compounds, such as pharmaceuticals and pesticides, and both metalloids and heavy metals, such as arsenic and lead. Metalloids and heavy metals have been detected in private drinking water wells, which do not fall under federal drinking water regulations, as well as in urban tap water, due to the introduction of contamination to the drinking water distribution system. Further, many so-called "emerging organic contaminants," which are present in drinking water sources at detectable levels but have unknown long-term health implications, do not fall under federal drinking water regulations. To protect the health of consumers, drinking water treatment at the point-of-use (POU) (i.e., the tap) is essential. Next-generation POU treatment technologies must require minimal energy inputs, be simple enough to permit broad application among different users, and be easily adaptable for removal of a wide range of pollutants. Nanomaterials, such as carbon nanotubes and iron oxide nanoparticles, are ideal candidates for next-generation drinking water treatment, as they exhibit unique, high reactivity and necessitate small treatment units. However, concerns regarding water pressure requirements and nanomaterial release into the treated supply limit their application in traditional reactor designs. To bridge the gap between potential and practical application of nanomaterials, this study utilizes electrospinning to fabricate composite nanofiber filters that effectively deploy nanomaterials in drinking water treatment. In electrospinning, a high voltage draws a polymer precursor solution (which vi can contain nanomaterial additives, in the case of nanocomposites) from a needle to deposit a non-woven nanofiber filter on a collector surface. Using electrospinning, we develop an optimized, macroporous carbon nanotubecarbon nanofiber composite that utilizes the sorption capacity of embedded carbon nanotubes, and achieves a key balance between material strength and reactivity towards organic pollutants. Additionally, via single-pot syntheses, we develop two optimized polymer-iron oxide composites for removal of heavy metal contamination by inclusion of iron oxide nanoparticles and either cationic or anionic surfactants in the electrospinning precursor solution. In hybrid materials that contain a well-retained quaternary ammonium surfactant (tetrabutylammonium bromide) and iron oxide nanoparticles, ion exchange sites and iron oxide sites are selective for chromate and arsenate removal, respectively. We demonstrated that a sulfonate surfactant, sodium dodecyl sulfate, acted as a removable porogen and an agent for surface segregation of iron oxide nanoparticles, thus enhancing composite performance for removal of lead, copper, and cadmium. Notably, nanoparticles embedded in composites exhibited comparable activity to freely dispersed nanoparticles. Collectively, the composites developed in this work represent a subst...

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N-Functionalized Carbon Nanotubes As a Source and Precursor of N-Nitrosodimethylamine: Implications for Environmental Fate, Transport, and Toxicity

Cited by 27 publications

References 48 publications

Identification of bioactive products from environmental transformation of steroids

Identification of bioactive products from environmental transformation of steroids

Development of chemically active metal oxide composite nanofiber filters for water treatment

Development of electrospun nanofiber composites for point-of-use water treatment

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