A5088028707- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Carbon Nanotubes in Composites
- Groundwater flow and contamination studies
- Recycling and Waste Management Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Nanoparticles: synthesis and applications
- Graphene research and applications
- Air Quality and Health Impacts
- Nanotechnology research and applications
- Extraction and Separation Processes
- Atmospheric chemistry and aerosols
- Petroleum Processing and Analysis
- Supercapacitor Materials and Fabrication
- Aerogels and thermal insulation
- Environmental Justice and Health Disparities
- Chemistry and Chemical Engineering
- Nanopore and Nanochannel Transport Studies
- Membrane Separation Technologies
- Reservoir Engineering and Simulation Methods
- Groundwater and Isotope Geochemistry
- Mass Spectrometry Techniques and Applications
- Microplastics and Plastic Pollution
- Surface Modification and Superhydrophobicity
- biodegradable polymer synthesis and properties
Massachusetts Institute of Technology
2012-2025
Yale University
2014-2024
Parsons (United States)
2009-2024
Vassar College
2009-2023
University of New Haven
2015-2020
IIT@MIT
2010-2020
Duke University
2012-2016
University of Oregon
2015
Woods Hole Oceanographic Institution
2006-2012
University of Michigan
2009
A broad overview of the achievements and emerging areas in field Green Chemistry.
Advances in the synthesis and scalable manufacturing of single-walled carbon nanotubes (SWCNTs) remain critical to realizing many important commercial applications. Here we review recent breakthroughs SWCNTs highlight key ongoing research areas challenges. A few applications that capitalize on properties are also reviewed with respect ways which science can enable advances these While primary focus this is framework SWCNT growth, draw connections mechanisms underlying other 1D 2D materials...
Pipeline safety in the United States has increased recent decades, but incidents involving natural gas pipelines still cause an average of 17 fatalities and $133 M property damage annually. Natural leaks are also largest anthropogenic source greenhouse methane (CH4) U.S. To reduce pipeline leakage increase consumer safety, we deployed a Picarro G2301 Cavity Ring-Down Spectrometer car, mapping 5893 (2.5 to 88.6 ppm CH4) across 1500 road miles Washington, DC. The δ13C-isotopic signatures...
We study synthesis of vertically aligned carbon nanotube (CNT) "forests" by a decoupled method that facilitates control the mean diameter and structural quality CNTs enables tuning kinetics for efficient growth to forest heights several millimeters. The substrate temperature (Ts) primarily determines CNT diameter, whereas independent rapid thermal treatment (Tp) C2H4/H2 reactant mixture significantly changes rate terminal height but does not change diameter. Synchrotron X-ray scattering is...
Hundreds of organic chemicals are used during natural gas extraction via high-volume hydraulic fracturing (HVHF). However, it is unclear whether these chemicals, injected into deep shale horizons, reach shallow groundwater aquifers and affect local water quality, either from those HVHF injection sites or the surface subsurface. Here, we report detectable levels compounds in samples private residential wells overlying Marcellus Shale northeastern Pennsylvania. Analyses purgeable extractable...
More than 30 years separate the two largest oil spills in North American history (the Ixtoc I and Macondo well blowouts), yet responses to both disasters were nearly identical spite of advanced material innovation during same time period. Novel, mechanically durable sorbents could enable (a) sorbent use open ocean, (b) automated deployment minimize workforce exposure toxic chemicals, (c) mechanical recovery spilled oils. Here, we explore durable, low-density (0.1-0.2 g cm(-3)), highly porous...
Unconventional natural gas development (UNGD) generates large volumes of wastewater, the detailed composition which must be known for adequate risk assessment and treatment. In particular, transformation products geogenic compounds disclosed additives have not been described. This study investigated six Fayetteville Shale wastewater samples organic using a suite one- two-dimensional chromatographic techniques to capture broad distribution chemical structures. Following application strict...
Rapid innovation in the field of electronic technologies through use rare earth and specialty elements (RESE) has made electronics industry one most rapidly evolving industries to date. However, innovations harvest these same materials from complex waste streams have not kept pace, thus leading an unsustainable material supply chain reliant on mining increasingly difficult-to-extract ores. Here, we aim provide a strategy mitigate challenges, identifying technical research development needed...
This article provides a bird's-eye-view of the status and scale commercialized nascent nanotechnologies in context global element cycles to prioritize guide relevant environmental health research.
Sunlight exposure can naturally mitigate microplastics pollution in the surface ocean, however it results emissions of dissolved organic carbon (DOC) whose characteristics and fate remain largely unknown. In this work, we investigated effects solar radiation on polyether (TPU_Ether) polyester (TPU_Ester) thermoplastic polyurethane, a thermoset polyurethane (PU_Hardened). The were irradiated with simulated light UV dose 350 MJ m-2, which corresponds to roughly 15 months outdoor at 31° N...
Anthropogenic organic carbon emissions reporting has been largely limited to subsets of chemically speciated volatile compounds. However, new aircraft-based measurements revealed total gas-phase that exceed oil sands industry-reported values by 1900% over 6300%, the bulk which was due unaccounted-for intermediate-volatility and semivolatile Measured facility-wide represented approximately 1% extracted petroleum, resulting in equivalent from all other sources across Canada combined. These...
The carbon nanotube (CNT) industry is expanding rapidly, yet little known about the potential environmental impacts of CNT manufacture. Here, we evaluate effluent composition a representative multiwalled synthesis by catalytic chemical vapor deposition (CVD) in order to provide data needed design strategies for mitigating any unacceptable emissions. During thermal pretreatment reactant gases (ethene and H2), found over 45 side-products were formed, including methane, volatile organic...
Comprehensive two-dimensional gas chromatography (GC × GC) was used to investigate the Bouchard 120 oil spill. The latter occurred on April 25, 2003, when barge spilled ∼ 375,000 liters of No. 6 fuel into Buzzards Bay, Massachusetts. In order gain a better understanding natural processes affecting fate product, we collected and analyzed oil-covered rocks from Nyes Neck beach in North Falmouth, Here discuss data samples May 9, six months later, November 23, 2003. Along with standard...
Photochemical processes affect the fate of spilled oil in environment, but relative contribution and kinetics these degradation pathways are not fully constrained. To address this problem, we followed weathering No. 6 fuel by periodically sampling rocks covered with a film from Buzzards Bay, MA after April 2003 Bouchard 120 spill. Two sets polycyclic aromatic hydrocarbon (PAH) isomers, benzo[a]pyrene (BAP) benzo[e]pyrene (BEP), benz[a]anthracene (BAA) chrysene (CHR), were found to have very...
Thermal treatments of feedstock gases (e.g., C2H4/H2) used during carbon nanotube (CNT) synthesis result in the formation a complex mixture volatile organic compounds and polycyclic aromatic hydrocarbons. Some these are likely important CNT precursors, while others superfluous possibly degrade product quality, form amorphous carbon, and/or contribute to growth termination. To simulate effect thermal treatment without this chemical complexity, we delivered trace amounts individual...
Volumes of natural gas extraction-derived wastewaters have increased sharply over the past decade, but ultimate fate those waste streams is poorly characterized. Here, we sought to (a) quantify residual fluid sources and endpoints bound scope potential stream impacts (b) describe organic pollutants discharged surface waters following treatment, a route likely ecological exposure. Our findings indicate that centralized treatment facilities (CWTF) received 9.5% (8.5 × 108 L) fluids in 2013,...
Discovering electrode materials with exceptional capacitance, an indicator of the ability a material to hold charge, is critical for developing capacitive deionization devices water desalination. Maganese oxides (MnOx) have shown promise as materials, but they exhibit trade-off in which higher loading active MnOx comes at cost lower conductivity. To address this challenge and achieve high salt adsorption, we fabricated electrodes comprising vertically aligned core–shell nanostructures using...
Abstract Desalination by membrane distillation (MD) using low‐grade or waste heat provides a potential route for sustainable water supply. Nonwetting, porous membranes that provide selective pathway vapor over nonvolatile salt are at the core of MD desalination. Conventional water‐repelling (i.e., hydrophobic and superhydrophobic membranes) fail to ensure long‐term desalination performance due pore wetting surface fouling. To address these challenges, defect‐free carbon nanotube forest...
Artisanal and small-scale gold mining (ASGM) is a significant contributor of mercury (Hg) contamination deforestation across the globe. In Colorado River watershed in Madre de Dios, Peru, have increased exponentially since 1980s, resulting major socioeconomic shifts region two national state emergency (2016 2019) response to concerns for wide-scale poisoning by these activities. This research employed watershed-scale soil particle detachment model environmental field sampling estimate role...