A5009184611- Environmental remediation with nanomaterials
- Nanoparticles: synthesis and applications
- Groundwater flow and contamination studies
- Heavy metals in environment
- Electrokinetic Soil Remediation Techniques
- Mercury impact and mitigation studies
- CO2 Sequestration and Geologic Interactions
- Geochemistry and Elemental Analysis
- Graphene and Nanomaterials Applications
- Nanomaterials for catalytic reactions
- Microplastics and Plastic Pollution
- Adsorption and biosorption for pollutant removal
- Toxic Organic Pollutants Impact
- Advanced oxidation water treatment
- Arsenic contamination and mitigation
- Gold and Silver Nanoparticles Synthesis and Applications
- Microbial bioremediation and biosurfactants
- Advanced Nanomaterials in Catalysis
- Polymer-Based Agricultural Enhancements
- Carbon Dioxide Capture Technologies
- Heavy Metal Exposure and Toxicity
- Membrane Separation Technologies
- Water Treatment and Disinfection
- Cloud Data Security Solutions
- Hydrocarbon exploration and reservoir analysis
Carnegie Mellon University
2016-2025
Environmental Energy & Engineering
2024
Duke University
2010-2020
Pittsburg State University
2020
Oregon State University
2020
Society of Environmental Toxicology and Chemistry
2020
University of Pittsburgh
2019
Brown University
2016-2017
St. Gregory's University
2017
University of Kentucky
2015
ADVERTISEMENT RETURN TO ISSUEPREVFEATURENEXTAssessing the Risks of Manufactured NanomaterialsMark R. Wiesner, Greg V. Lowry, Pedro Alvarez, Dianysios Dionysiou, and Pratim BiswasCite this: Environ. Sci. Technol. 2006, 40, 14, 4336–4345Publication Date (Web):July 15, 2006Publication History Published online15 July 2006Published inissue 1 2006https://pubs.acs.org/doi/10.1021/es062726mhttps://doi.org/10.1021/es062726mnewsACS Publications. This publication is available under these Terms Use....
ADVERTISEMENT RETURN TO ISSUEPREVFeatureNEXTTransformations of Nanomaterials in the EnvironmentGregory V. Lowry*†‡, Kelvin B. Gregory†‡, Simon C. Apte§, and Jamie R. Lead∥#View Author Information† Center for Environmental Implications Nanotechnology, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States‡ Civil Engineering, States§ Contaminant Chemistry Ecotoxicology Program, CSIRO Land Water, Locked Bag 2007, Kirrawee NSW 2232, Australia∥ School Geography, Earth Sciences,...
Nanoscale zerovalent iron (NZVI) rapidly transforms many environmental contaminants to benign products and is a promising in-situ remediation agent. To be effective, NZVI should form stable dispersions in water such that it can delivered water-saturated porous media the contaminated area. Limited mobility of has been reported, however, attributed its rapid aggregation. This study uses dynamic light scattering investigate aggregation from single nanoparticles micrometer size aggregates,...
Concerns with the environmental and health risk of widely distributed, commonly used nanoparticles are increasing. Nanosize titanium dioxide (TiO2) is in air water remediation numerous products designed for direct human use consumption. Its effectiveness deactivating pollutants killing microorganisms relates to photoactivation resulting free radical activity. This property, coupled its multiple potential exposure routes, indicates that nanosize TiO2 could pose a biological targets sensitive...
Nanoscale Fe0 particles are a promising technology for in situ remediation of trichloroethene (TCE) plumes and TCE-DNAPL source areas, but the physical chemical properties controlling their reactivity not yet understood. Here, TCE reaction rates, pathways, efficiency two nanoscale measured batch reactors: synthesized from sodium borohydride reduction ferrous iron (Fe/B) commercially available (RNIP). Reactivity was determined under iron-limited (high [TCE]) excess (low conditions with...
Experiments were conducted to assess the durability of cements in wells penetrating candidate formations for geologic sequestration CO2. These experiments showed a significant variation initial degradation (9 days exposure) based on curing conditions. The high-temperature (50 °C) and high-pressure (30.3 MPa) environment increased degree hydration caused change microstructure distribution Ca(OH)2(s) phase within cement. Cement cured at 50 °C 30.3 MPa (representing conditions) proved be more...
The surfaces of nanoscale zerovalent iron (NZVI) used for groundwater remediation must be modified to mobile in the subsurface emplacement. Adsorbed polymers and surfactants can electrostatically, sterically, or electrosterically stabilize nanoparticle suspensions water, but their efficacy will depend on ionic strength cation type as well physical chemical heterogeneities aquifer material. Here, effect mobility bare, polymer-, surfactant-modified NZVI is evaluated water-saturated sand...
Despite the increasing use of silver nanoparticles (Ag-NPs) in nanotechnology and their toxicity to invertebrates, transformations fate Ag-NPs environment are poorly understood. This work focuses on sulfidation processes PVP-coated Ag-NPs, one most likely corrosion phenomena that may happen environment. The sulfur ratio was varied order control extent transformation sulfide (Ag2S). A combination synchrotron-based X-ray Diffraction (XRD) Extended Absorption Fine Structure spectroscopy shows...
Subsurface injection of nanoscale zerovalent iron (NZVI) has been used for the in situ remediation chlorinated solvent plumes and DNAPL source zones. Due to cost materials placement, efficacy this approach depends on NZVI reactivity longevity, selectivity target contaminant relative nonspecific corrosion yield H2, access Fe0 particles. Both reaction pH age particles (i.e., content) could affect longevity. Here, rates H2 evolution trichloroethene (TCE) reduction are measured over lifetime at...
Nanoenabled foliar-applied agrochemicals can potentially be safer and more efficient than conventional products. However, limited understanding about how nanoparticle properties influence their interactions with plant leaves, uptake, translocation through the mesophyll to vasculature, transport rest of prevents rational design. This study used a combination Au quantification spatial analysis investigate size (3, 10, or 50 nm) coating chemistry (PVP versus citrate) gold nanoparticles (AuNPs)...
Rapid in situ degradation of chlorinated solvents present as nonaqueous phase liquids (NAPL) can be accomplished using reactive zerovalent nanoiron particles. Prior studies have shown that transport the subsurface is limited, and successful delivery essential for effective remediation. Here, physical properties bare modified are measured, laboratory column reactors used to compare three types surface-modified nanoiron; triblock polymer-modified, surfactant-modified, a commercially available...
Titanium dioxide is a widely used nanomaterial whose photo-reactivity suggests that it could damage biological targets (e.g., brain) through oxidative stress (OS).Brain cultures of immortalized mouse microglia (BV2), rat dopaminergic (DA) neurons (N27), and primary embryonic striatum, were exposed to Degussa P25, commercially available TiO(2) nanomaterial. Physical properties P25 measured under conditions paralleled measures.P25 rapidly aggregated in physiological buffer (800-1,900 nm; 25...
The solubility of Ag NPs can affect their toxicity and persistence in the environment. We measured organic-coated silver nanoparticles (Ag NPs) having particle diameters ranging from 5 to 80 nm that were synthesized using various methods, with different organic polymer coatings including poly(vinylpyrrolidone) gum arabic. size morphology characterized by transmission electron microscopy (TEM). X-ray absorption fine structure (XAFS) spectroscopy synchrotron-based total scattering pair...
Nanomaterials are highly dynamic in biological and environmental media. A critical need for advancing health safety research nanomaterials is to identify physical chemical transformations that affect the nanomaterial properties their toxicity. Silver nanoparticles, one of most toxic well-studied nanomaterials, readily react with sulfide form Ag(0)/Ag2S core-shell particles. Here, we show sulfidation decreased silver nanoparticle toxicity four diverse types aquatic terrestrial eukaryotic...
In contrast to conventional carbon capture systems for power plants and other large point sources, the system described in this paper captures CO2 directly from ambient air. This has advantages that emissions diffuse sources past may be captured. The objective of research is determine feasibility a NaOH spray-based contactor use an air by estimating cost energy requirements per unit A prototype constructed tested measure absorption, use, evaporative water loss compared with theoretical...
Nanoparticle zeta potentials are easy to measure and proposed as a required property for complete nanoparticle characterization, but relevant metadata must be reported with potential scientifically useful.
Pristine silver nanoparticles (AgNPs) are not chemically stable in the environment and react strongly with inorganic ligands such as sulfide chloride once is oxidized. Understanding environmental transformations of AgNPs presence specific crucial to determining their fate toxicity environment. Chloride (Cl(-)) a ubiquitous ligand strong affinity for oxidized often present natural waters bacterial growth media. Though can affect results AgNPs, interaction rarely considered challenging study...
Transformations and long-term fate of engineered nanomaterials must be measured in realistic complex natural systems to accurately assess the risks that they may pose. Here, we determine behavior poly(vinylpyrrolidone)-coated silver nanoparticles (AgNPs) freshwater mesocosms simulating an emergent wetland environment. AgNPs were either applied water column or terrestrial soils. The distribution among water, solids, biota, Ag speciation soils sediment was determined 18 months after dosing....
Polychlorinated biphenyl (PCB)-contaminated sediments remain a significant threat to humans and aquatic ecosystems. Dredging disposal is costly, so viable in situ technologies dechlorinate PCBs are needed. This study demonstrates that nanoscale zerovalent iron (ZVI) dechlorinates lower-chlorinated products under ambient conditions, provides insight into structure−activity relationships between PCB isomers, compares the reactivity of ZVI palladized microscale ZVI. Six congeners were studied...