A5056977498- Microplastics and Plastic Pollution
- Toxic Organic Pollutants Impact
- Nanoparticles: synthesis and applications
- Water Quality Monitoring and Analysis
- Graphene and Nanomaterials Applications
- Air Quality Monitoring and Forecasting
- Per- and polyfluoroalkyl substances research
- Carbon Nanotubes in Composites
- Chemical Analysis and Environmental Impact
- Fecal contamination and water quality
- Polymer Nanocomposites and Properties
- Water Treatment and Disinfection
- Impact of Light on Environment and Health
- Wastewater Treatment and Reuse
- Environmental Justice and Health Disparities
- Pharmaceutical and Antibiotic Environmental Impacts
- Effects and risks of endocrine disrupting chemicals
- Quantum, superfluid, helium dynamics
- Amphibian and Reptile Biology
- Carbon and Quantum Dots Applications
- Advanced oxidation water treatment
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Polymer crystallization and properties
- Molecular Spectroscopy and Structure
Environmental Protection Agency
2016-2025
Oak Ridge Institute for Science and Education
2018-2020
Oak Ridge Associated Universities
2018-2020
VA Office of Research and Development
2018
University of Georgia
2013
A major use of multi-walled carbon nanotubes (MWCNTs) is as functional fillers embedded in a solid matrix, such plastics or coatings. Weathering and abrasion the matrix during can lead to environmental releases MWCNTs. Here we focus on protocol identify quantify primary release induced by weathering, assess reproducibility, transferability, sensitivity towards different materials uses. We prepared 132 specimens two polymer-MWCNT composites containing same grade MWCNTs used earlier OECD...
Although next-generation per- and polyfluorinated substances (PFAS) were designed implemented as safer environmentally degradable alternatives to "forever" legacy PFAS, there is little evidence support the actual transformation of these compounds less safety transformed products in environment. Multiple congeners one such PFAS alternative, chloro-perfluoropolyether carboxylates (Cl-PFPECAs), have been found New Jersey soils surrounding a manufacturing facility. These are ideal candidates for...
Toxicant concentrations in surface waters are of environmental concern due to their potential impacts humans and wildlife. Numerical models provide system insight, support management decisions, scenario testing on the toxicants. The Water Quality Analysis Simulation Program (WASP) is a widely used framework for developing site-specific simulating toxicant sediments over range complexities temporal spatial scales. WASP8, with Advanced module, has been recently released, incorporating complete...
Weathering and fragmentation of polymer nanocomposites.
The production of graphene-family nanomaterials (GFNs) has increased appreciably in recent years. Graphene oxide (GO) been found to be the most toxic nanomaterial among GFNs and, our knowledge, no studies have conducted model its fate and transport environment. Lab show that GO undergoes phototransformation surface waters under sunlight radiation resulting formation photoreduced (rGO). In this study, recently updated Water Quality Analysis Simulation Program (WASP8) is used simulate...
Nano-enabled consumer materials could degrade during their use or end-of-life disposal due to weathering. Understanding the potential risks from release and toxicity of embedded nanomaterial is needed.
Infrared spectra in the C–H stretch region are reported for allyl (CH2CHCH2) and peroxy (CH2=CH–CH2OO·) radicals solvated superfluid helium nanodroplets. Nine bands spectrum of radical have resolved rotational substructure. We assigned three these to ν1 (a1), ν3 ν13 (b2) four others ν14/(ν15+2ν11) ν2/(ν4+2ν11) (a1) Fermi dyads, an unassigned resonant polyad is observed vicinity band. Experimental coupling constants associated with dyads consistent quartic force obtained from density...
Coliphages can indicate contamination of recreational waters and previous studies show that sunlight is important in altering densities coliphages, other indicator microorganisms, pathogens aquatic environments. Here, we report on laboratory light-induced inactivation two coliphage groups—male-specific (F+) somatic coliphage—under various conditions phosphate-buffered water (PBW). Strains isolated from wastewater treatment facilities strains (MS2 phiX174 coliphages) were evaluated....
Abstract Fecal indicator organisms (FIOs), such as Escherichia coli and enterococci, are often used surrogates of contamination in the context beach management; however, bacteriophages may be more reliable indicators than FIO due to their similarity viral pathogens terms size persistence environment. In past, mechanistic modeling environmental has focused on FIOs, with virus bacteriophage efforts remaining limited. this paper, we describe development application a fate transport model...