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Applications, Transformations, and Impacts of Copper Oxide Nanoparticles in Environmental Systems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Applications, Transformations, and Impacts of Copper Oxide Nanoparticles in Environmental Systems./
作者:	Rippner, Devin Andrew.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	125 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
標題:	Toxicology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10980864
ISBN:	9780438930599

Applications, Transformations, and Impacts of Copper Oxide Nanoparticles in Environmental Systems.
Rippner, Devin Andrew.

Applications, Transformations, and Impacts of Copper Oxide Nanoparticles in Environmental Systems. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 125 p.

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--University of California, Davis, 2018.

This item is not available from ProQuest Dissertations & Theses.

The market for manufactured nanomaterials (MNMs) is rapidly expanding, with MNMs incorporated into a wide variety of products including paints, personal care products, high definition TVs, and recently, in algaecides and fungicides. Copper based nanomaterials, including copper oxide nanoparticles (CuO NPs), are particularly popular for use as algaecides and fungicides, but exhibit significant toxicity to plants in terrestrial and aquatic ecosystems. In California alone, Cu-based fungicides and fungicides were used on >800,000 ha of cropland. Given the increasing popularity of copper oxide nanomaterials for crop protection use, investigation into the potential impacts of these products on agricultural and environmental ecosystems is extremely important. Copper oxide nanoparticles (CuO NPs) were previously shown to negatively impact the growth of duckweed (Landoltia punctata) a model aquatic plant consumed by water fowl and widely found in agricultural runoff ditches in temperate climates. However, these prior studies involving CuO NP toxicity to duckweed have focused on systems without the presence of dissolved organic matter (DOM). In chapter 2, duckweed growth inhibition was shown to be a function of aqueous Cu2+ concentration. Growth inhibition was greatest from aqueous CuCl2 and, for particles, increased with decreasing CuO particle size. The dissolution of CuO NPs in ½ Hoagland's solution was measured to increase with decreasing particle size and in the presence of Suwannee river humic and fulvic acids (HA; FA). However, the current results suggest that HA, and to a lesser extent, FA, decrease the toxicity of both CuO NPs and free ionized Cu to duckweed, likely by inhibiting Cu availability through Cu-DOM complex formation. Such results are consistent with changes to Cu speciation as predicted by speciation modelling software and suggest that DOM changes Cu speciation and therefore toxicity in natural systems. To control the growth, stability, and dispersibility of CuO NPs, surface modification with various surfactants, including cetyltrimethylammonium bromide (CTAB), is widely employed. Despite its well-known phytotoxicity, no studies have explicitly investigated how CTAB might influence nanoparticle phytotoxicity in environmental systems. In chapter 3, CTAB released by CTAB surface modified CuO nanoparticles (SM-CuO NPs) was shown to inhibit the growth of duckweed (Landoltia punctata), even when administered at subtoxic copper concentrations. Organic ligands such as humic acid (HA) and ethylenediaminetetraacetic acid (EDTA) decreased the growth inhibition associated with exposure to SM-CuO NPs, likely through electrostatic and hydrophobic interactions with CTAB. Such results highlight a need for better communication between toxicologists and synthetic chemists to develop green alternatives for nanoparticle synthesis. In soils, removing metals after deposition is nearly impossible without resorting to excavation or phytoremediation. Recent developments in nanotechnology for medical use have led to the manufacture of magnetic nanoparticles with custom surface properties, which may be well suited for contaminant removal. In chapter 4, azide functionalized cobalt oxide nanoparticles (N3CoO NPs), magnetically mounted in porous media, were radiolabeled in-situ with copper-64 [64Cu]-1,4,7-triazacyclononane triacetic acid (NOTA)-azadibenzocyclooctyne (ADIBO) via the copper-free Huisgen 1,3-dipolar cycloaddition reaction. Retention of the nanoparticles on the magnets was >99% over the course of the study, allowing for the precise location of radiolabel retention in glass beads (GB), sand (S), and a natural fine sand (FS). Addition of magnetically mounted nanoparticles to columns increased radiolabel retention after 15 minutes of equilibration, which differed from the magnet-free control in GB and S. After separation from the columns NPs retained ~15% of the administered radiolabel in GB and S, demonstrating as a proof of concept the feasibility of using magnetically recoverable nanoparticles for contaminant removal from soil systems.

ISBN: 9780438930599Subjects--Topical Terms:

556884
Toxicology.
Subjects--Index Terms:

Copper oxide nanoparticles

Applications, Transformations, and Impacts of Copper Oxide Nanoparticles in Environmental Systems.
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500 $a Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Parikh, Sanjai J.
502 $a Thesis (Ph.D.)--University of California, Davis, 2018.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a The market for manufactured nanomaterials (MNMs) is rapidly expanding, with MNMs incorporated into a wide variety of products including paints, personal care products, high definition TVs, and recently, in algaecides and fungicides. Copper based nanomaterials, including copper oxide nanoparticles (CuO NPs), are particularly popular for use as algaecides and fungicides, but exhibit significant toxicity to plants in terrestrial and aquatic ecosystems. In California alone, Cu-based fungicides and fungicides were used on >800,000 ha of cropland. Given the increasing popularity of copper oxide nanomaterials for crop protection use, investigation into the potential impacts of these products on agricultural and environmental ecosystems is extremely important. Copper oxide nanoparticles (CuO NPs) were previously shown to negatively impact the growth of duckweed (Landoltia punctata) a model aquatic plant consumed by water fowl and widely found in agricultural runoff ditches in temperate climates. However, these prior studies involving CuO NP toxicity to duckweed have focused on systems without the presence of dissolved organic matter (DOM). In chapter 2, duckweed growth inhibition was shown to be a function of aqueous Cu2+ concentration. Growth inhibition was greatest from aqueous CuCl2 and, for particles, increased with decreasing CuO particle size. The dissolution of CuO NPs in ½ Hoagland's solution was measured to increase with decreasing particle size and in the presence of Suwannee river humic and fulvic acids (HA; FA). However, the current results suggest that HA, and to a lesser extent, FA, decrease the toxicity of both CuO NPs and free ionized Cu to duckweed, likely by inhibiting Cu availability through Cu-DOM complex formation. Such results are consistent with changes to Cu speciation as predicted by speciation modelling software and suggest that DOM changes Cu speciation and therefore toxicity in natural systems. To control the growth, stability, and dispersibility of CuO NPs, surface modification with various surfactants, including cetyltrimethylammonium bromide (CTAB), is widely employed. Despite its well-known phytotoxicity, no studies have explicitly investigated how CTAB might influence nanoparticle phytotoxicity in environmental systems. In chapter 3, CTAB released by CTAB surface modified CuO nanoparticles (SM-CuO NPs) was shown to inhibit the growth of duckweed (Landoltia punctata), even when administered at subtoxic copper concentrations. Organic ligands such as humic acid (HA) and ethylenediaminetetraacetic acid (EDTA) decreased the growth inhibition associated with exposure to SM-CuO NPs, likely through electrostatic and hydrophobic interactions with CTAB. Such results highlight a need for better communication between toxicologists and synthetic chemists to develop green alternatives for nanoparticle synthesis. In soils, removing metals after deposition is nearly impossible without resorting to excavation or phytoremediation. Recent developments in nanotechnology for medical use have led to the manufacture of magnetic nanoparticles with custom surface properties, which may be well suited for contaminant removal. In chapter 4, azide functionalized cobalt oxide nanoparticles (N3CoO NPs), magnetically mounted in porous media, were radiolabeled in-situ with copper-64 [64Cu]-1,4,7-triazacyclononane triacetic acid (NOTA)-azadibenzocyclooctyne (ADIBO) via the copper-free Huisgen 1,3-dipolar cycloaddition reaction. Retention of the nanoparticles on the magnets was >99% over the course of the study, allowing for the precise location of radiolabel retention in glass beads (GB), sand (S), and a natural fine sand (FS). Addition of magnetically mounted nanoparticles to columns increased radiolabel retention after 15 minutes of equilibration, which differed from the magnet-free control in GB and S. After separation from the columns NPs retained ~15% of the administered radiolabel in GB and S, demonstrating as a proof of concept the feasibility of using magnetically recoverable nanoparticles for contaminant removal from soil systems.
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650 4 $a Soil sciences. $3 2122699
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653 $a Copper oxide nanoparticles
653 $a In-situ click chemistry
653 $a Magnetic nanoparticles
653 $a Nanotoxicology
653 $a Radiochemistry
653 $a Surfactants
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710 2 $a University of California, Davis. $b Soils and Biogeochemistry. $3 3282973
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