Residual metal impurities in carbon nanotubes (CNTs) provide a means to distinguish CNT from non-CNT sources of elemental carbon in environmental samples. A practical and cost-effective analytical approach is needed to support routine surface monitoring of CNT metal tracers using wipe sampling. Wipe sampling for CNT metal tracers is considered a qualitative indicator of the presence of CNTs, not a quantitative exposure metric. In this study, two digestion approaches (microwave-assisted nitric acid/HO digestion and ultrasonic nitric/HF acid digestion) in conjunction with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) determination were evaluated for their ability to extract metal impurities from CNT particles captured on wipe substrates. Aliquots of different carbon nanotubes (including NIST 2483 single-wall CNT) with and without GhostWipes™ (ASTM E-1792 compliant) were used to compare the performance of the digestion methods. The microwave digestion method accommodated the bulky wipe sample and also eliminated potential ICP-MS signal interferences related to incomplete digestion. Although quantitative recoveries requiring lengthy multistep digestion protocols may be necessary in other applications, the near-total recoveries achieved in the present study for CNT catalyst elements were adequate for identifying surface contamination of CNTs in the workplace using wipe sampling.
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http://dx.doi.org/10.1155/2016/3834292 | DOI Listing |
ACS Appl Energy Mater
January 2025
Hollingsworth and Vose, Groton, Massachusetts 01450, United States.
A low-cost method of green hydrogen production via the modification of a lead acid battery has been achieved, resulting in a hydrogen flow rate of 5.3 L min from a 20-cell string. The electrochemical behavior and catalytic effect of various metal additives on the hydrogen evolution reaction (HER) was evaluated using cyclic voltammetry.
View Article and Find Full Text PDFRSC Adv
January 2025
Central Labs, King Khalid University AlQura'a, P.O. Box 960 Abha Saudi Arabia.
Investigations on two-dimensional materials for efficient carbon dioxide (CO) capture and storage have recently attracted much attention, especially in the global industrial sector. In this work, the CO uptake by three configurations of two-dimensional magnesium oxide was investigated using density functional theory. CO capture analysis was performed considering the geometrical, thermophysical, vibrational, electronic and optical properties.
View Article and Find Full Text PDFEnviron Sci Pollut Res Int
January 2025
Occupational Environment Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
Sodium chloride, commonly referred to as table salt, is the most widely utilized seasoning in culinary applications. Nevertheless, the most of oral salts used contain impurities. Arsenic (As), mercury (Hg), cadmium (Cd), and lead (Pb) are the most common impurities found in salt.
View Article and Find Full Text PDFNanoscale Adv
January 2025
Institute of Theoretical and Applied Research, Duy Tan University Ha Noi 100000 Vietnam
In this work, we investigate the electronic and magnetic properties of the InSe monolayer enriched by doping with IVA-group (Si and Ge) and VA-group (P and As) atoms. Both In and Se sublattices are considered as doping sites to realize n- and p-type doping (X@InSe and X@InSe systems, X = Si, Ge, P, and As), respectively. The pristine InSe monolayer is an indirect gap semiconductor with a band gap of 1.
View Article and Find Full Text PDFJ Colloid Interface Sci
January 2025
Faculty of Metallurgical and Energy Engineering, Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093 China. Electronic address:
High-value recycling of photovoltaic waste graphite (WG) is an effective path to achieve "carbon neutrality". However, the current most adopted methods are landfilling, incineration and leaching, which can lead to undesirable environmental contamination and waste of resources. Here, an energy-efficient and high-value flash recycling strategy is developed in which photovoltaic WG is converted to high-capacity and high-rate graphite anode for lithium-ion batteries (LIBs) in milliseconds.
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