Physical Sciences and Mathematics Commons^™

Uptake And Accumulation Of Engineered Nanomaterials By Agricultural Crops And Associated Risks In The Environment And Food Safety, Yingqing Deng

Doctoral Dissertations

Engineered nanomaterials (ENMs) are being discharged into the environment and to agricultural fields, with unknown impacts on crop species. This study focused on the bioaccumulation of engineered nanomaterials into crops and the associated impact on plant growth and plant uptake of secondary contaminant. Investigations into the interactions between nanomaterials and agricultural plants will provide a more developed understanding of nanomaterials implications in the environment; in addition, evaluations of the risks associated with plant-nanomaterials interactions will provide guidelines for safe use of nanomaterials in agriculture. In the screening study on phytotoxicity, carbon-based nanoparticles (NPs) including C₆₀, MWCNTs, NH_{2 …}

Characterization Of S-Swcnt/Pf-Pd Dispersions And Networks, Tamara N. El-Hayek Ms., Jeffrey Blackburn, Andrew Ferguson, Tammy Pheuphong

STAR Program Research Presentations

Single-Walled Carbon Nanotubes (SWCNTs) are being investigated for their use in a wide variety of renewable energy applications. Their unique physical properties contribute to desirable traits such as a high carrier mobility, strong optical absorption and tunable electronic band gap. Unfortunately, due to variability in certain parameters, SWCNTs are limited in their application. The major drawback is that SWCNTs are variable in size and type and typical synthetic methods are not selective. As a result, selective methods must be developed in order to sort these tubes and extract those which are desirable for a particular application. Though there are several …

Removal Of Perfluorooctanoic Acid From Water Using Primitive, Conventional And Novel Carbonaceous Sorbent Materials, Christopher K. Brown

Theses and Dissertations

Polyfluoroalkyl Substances (PFAS), like perfluorooctanoic acid, have been used for the last 50 years in a wide variety of industrial processes and consumer-based products, including polymer additives, lubricants, fire retardants and suppressants, pesticides, and surfactants (Buck et al. 2015). The Department of Defense (DoD) has used PFAS-based Aqueous Film Forming Foam (AFFF) at fire training facilities and aircraft hangars. AFFF has contaminated approximately 600 sites classified as fire training facilities with PFAS (Huang, 2013).

This study focused on testing the most likely carbonaceous adsorbent compounds to remediate PFAS-contaminated sites on Air Force installations. Batch tests were performed to determine the …