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polycyclicaromatichydrocarbons, etc ; carbon; carbon nanotubes; catalysts; dehydrogenation; energy; geometry; nanoparticles; optical isomerism; Show all 9 Subjects
Abstract:
... The chirality controllable synthesis of single-walled carbon nanotubes (SWCNTs) by the catalytic transformation of designed large polyaromatic hydrocarbon molecules has made significant progress in recent years, but the underlying mechanism, such as the role of the catalyst, has never been revealed at the atomic level. In this study, the energy profiles of the dehydrogenation processes from the C₆ ...
... Benzo[a]pyrene (BaP) is a polycyclic aromatic hydrocarbon (PAH) that has been found in barbecued meat products and has shown carcinogenic properties in humans. The purpose of this study was to investigate the effect of vinegar (fermented vinegars and distilled vinegar) on the generation of BaP in barbecued pork sausages. The results showed that fermented vinegars and distilled vinegar could signif ...
polycyclicaromatichydrocarbons, etc ; furans; indoles; nitrogen; oxygen; Show all 5 Subjects
Abstract:
... In this Letter, we disclose a simple and effective method to access a variety of phenanthro[9,10-b]furan and 1H-dibenzo[e,g]indole derivatives based on the design of a carbene-catalyzed intramolecular Stetter reaction followed by a Paal–Knorr reaction in one-pot. These compounds are a class of π-extended polycyclic aromatic hydrocarbon (PAH) derivatives containing an oxygen/nitrogen atom. The prac ...
polycyclicaromatichydrocarbons, etc ; air; microbial bioremediation; soil pollution; water; Show all 5 Subjects
Abstract:
... This review summarizes current knowledge of the polycyclic aromatic hydrocarbons (PAHs) contaminant in the environment and the importance of using benzo(a)pyrene in this study. It highlights the removal techniques in eliminating the PAHs and their limitations on the bioremediation method. The factors that affect the remediation were thoroughly explained in this paper, focusing on removing PAHs usi ...
polycyclicaromatichydrocarbons, etc ; Alcaligenes; Stenotrophomonas; bacterial communities; electrochemistry; environment; humans; Show all 7 Subjects
Abstract:
... Pyrene, a typical four-ring polycyclic aromatic hydrocarbon, is abundantly present in the environment and is potentially harmful to the human body. In this study, single-chamber air-cathode microbial fuel cells (MFCs) were used to treat pyrene, and the ensuing degradation, electrical parameters, and microbial changes were analyzed. The results showed that MFCs could degrade pyrene, and the maximum ...
polycyclicaromatichydrocarbons, etc ; biochar; bioremediation; cost effectiveness; environment; socioeconomics; sodium percarbonate; toxicity; Show all 8 Subjects
Abstract:
... Biochar is gaining incredible importance for remediation applications due to their attractive removal properties. Moreover, it is becoming ecofriendly, cost-effective and sustainable bioadsorbents towards replacing expensive activated carbons. Studies reveal biochar effectiveness for removal of important and potentially severe organic pollutants such as antibiotics and pesticides. Recent research ...
polycyclicaromatichydrocarbons, etc ; environmental assessment; estuaries; pollution; risk; sediments; soil organic matter; Show all 7 Subjects
Abstract:
... Sediment and water samples were collected from Xiangxi Bay in the Three Gorges Reservoir area of China to study the spatial distribution, migration, and ecological risks of 16 priority polycyclic aromatic hydrocarbons (PAHs) across four periods associated with different water levels from June 2017 to March 2018. Results showed that PAH contents ranged from 178.61 to 250.20 ng L⁻¹ in water and from ...
polycyclicaromatichydrocarbons, etc ; Lewis acids; enzymes; epoxidation reactions; heme; metabolites; regression analysis; solvents; Show all 8 Subjects
Abstract:
... Polycyclic Aromatic Hydrocarbon (PAHs) presents one of the most abundant class of environmental pollutants. Recent study shows a lab-synthesized PAHs derivative, helicenium, can selectively kill cancer cells rather than normal cells, calling for the in-depth understanding of the metabolic process. However, the origin of metabolites diversity and selectivity of P450 catalyzed PAHs metabolic activat ...
polycyclicaromatichydrocarbons, etc ; Pseudomonas; biodegradation; biofilm; bioremediation; coculture; fluid mechanics; plankton; public health; Show all 9 Subjects
Abstract:
... Polycyclic aromatic hydrocarbons (PAHs) are pollutants of critical environmental and public health concern and their elimination from contaminated sites is significant for the environment. Biodegradation studies have demonstrated the ability of bacteria in biofilm conformation to enhance the biodegradation of pollutants. In this study, we used our newly developed microfluidic platform to explore b ...
polycyclicaromatichydrocarbons, etc ; Monte Carlo method; Singapore; air; guidelines; risk; volatile organic compounds; Show all 7 Subjects
Abstract:
... Millions of passengers wait for buses at Integrated Transport Hubs (ITH) daily in metropolitan cities. Environmental exposure and associated risk for passengers is of great public concern. In this study, eight volatile organic compounds (VOCs) and the 16 EPA priority polycyclic aromatic hydrocarbons (PAHs) were analyzed in airborne samples collected from indoor waiting areas (Indoor) and bus parks ...
polycyclicaromatichydrocarbons, etc ; bioavailability; cyclodextrins; desorption; environment; environmental quality; quality control; risk; t-test; Show all 9 Subjects
Abstract:
... There is a strong need for certified reference materials in the quality assurance of nonionic soil contaminant bioavailability estimations through physicochemical methods. We applied desorption extraction, a method recently standardized as ISO16751, to determine the bioavailable concentration of the most commonly regulated polycyclic aromatic hydrocarbon (PAH), benzo(a)pyrene (BaP), in the referen ...
polycyclicaromatichydrocarbons, etc ; air sampling; detection limit; gas chromatography; pollutants; researchers; tandem mass spectrometry; toxicity; Show all 8 Subjects
Abstract:
... Polycyclic aromatic hydrocarbons (PAHs) are a class of toxic organic pollutants. Until now, they have been detected in many regions and various environmental matrix. However, not all PAHs are usually detected by researchers, and no methods is established to analyze systematically hundreds of PAHs. In this study, 123 PAHs were identified and quantified using gas chromatography−tandem triple-quadrup ...
polycyclicaromatichydrocarbons, etc ; activation energy; air; air pollution; combustion; feedstocks; oils; polyethylene; porosity; pyrolysis; zeolites; Show all 11 Subjects
Abstract:
... Bio-heavy oil (BHO) is a renewable fuel, but its efficient use is problematic because its combustion may emit hazardous air pollutants (e.g., polycyclic aromatic hydrocarbon (PAH) compounds, NOₓ, and SOₓ). Herein, catalytic fast pyrolysis over HZSM-5 zeolite was applied to upgrading BHO to drop-in fuel-range hydrocarbons with reduced contents of hazardous species such as PAH compounds and N- and S ...
polycyclicaromatichydrocarbons, etc ; air pollution; coasts; industrialization; marine pollution; pollutants; population growth; uncertainty; uncertainty analysis; Show all 9 Subjects
Abstract:
... An analytical framework was proposed for analyzing long-term chemical pollution in a coastal region with limited environmental data. The framework consists of compiling and synthesizing the available knowledge including the chemical's properties and the environmentally relevant data, as well as the data obtained by past monitoring studies. The gathered data is analyzed to assess multimedia fate of ...
polycyclicaromatichydrocarbons, etc ; Paracoccus aminovorans; adsorption; bacterial growth; biodegradation; clay; energy; hydrophobicity; kaolinite; montmorillonite; soil; Show all 11 Subjects
Abstract:
... Clay minerals play an important role in biogeochemical cycling. Here, kaolinite and montmorillonite, the two most abundant and widespread clay minerals with typical layered structures, were selected to investigate and compare their effects on the biodegradation of benzo[a]pyrene (BaP) by Paracoccus aminovorans HPD-2 and to investigate the underlying interface mechanisms. Overall, the BaP degradati ...
polycyclicaromatichydrocarbons, etc ; biodegradation; bioremediation; biosurfactants; carcinogenicity; hydrophobicity; microextraction; microwave treatment; organic matter; sediments; solvents; Show all 11 Subjects
Abstract:
... Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic environmental pollutants that are extremely hydrophobic in nature and resistant to biological degradation. Extraction of PAHs from environmental matrices is the first and most crucial step in PAH quantification. Extraction followed by quantification is essential to understand the extent of contamination prior to the application of remediatio ...
polycyclicaromatichydrocarbons, etc ; Myxococcales; Rhodobacterales; Sphingobacteriales; ecosystems; environment; genes; keystone species; molecular weight; regression analysis; soil; Show all 11 Subjects
Abstract:
... Soil microbial diversity is an essential driver of multiple ecosystem functions and services. However, the role and mechanisms of microbial diversity in the dissipation of persistent organic pollutants in soil are largely unexplored. Here, a gradient of soil microbial diversity was constructed artificially by a dilution-to-extinction approach to assess the role of soil microbial diversity in the d ...
polycyclicaromatichydrocarbons, etc ; hydrogen; hydrogenation; kinetics; models; oils; partial pressure; petroleum; process design; reaction mechanisms; temperature; Show all 11 Subjects
Abstract:
... A molecular-level reaction kinetic model for the diesel hydro-upgrading (DHU) process was established on the basis of the structure-oriented lumping (SOL) method to describe the hydro-upgrading reaction network and investigate the reaction behaviors of polycyclic aromatic hydrocarbon (PAH) molecules. Twenty-two structural increments were selected to construct an 835 row × 23 column feed oil molecu ...
... Following an oil spill, accurate assessments of the ecological risks of exposure to compounds within petroleum are required, as is knowledge regarding how those risks may change with the use of chemical dispersants. Laboratory toxicity tests are frequently used to assess these risks, but differences in the methods for preparation of oil‐in‐water solutions may confound interpretation, as may differ ...
polycyclicaromatichydrocarbons, etc ; biodegradation; bioremediation; community structure; oxidants; oxidation; polluted soils; pollution; soil bacteria; subsurface soil layers; Show all 10 Subjects
Abstract:
... Combined chemical oxidation and bioremediation is a promising method of treating polycyclic aromatic hydrocarbon (PAH) contaminated soil, wherein indigenous soil bacteria play a critical role in the subsequent biodegradation of PAHs after the depletion of the oxidant. In this study, different Fenton conditions were applied by varying either the oxidation mode (conventional Fenton (CF), Fenton-like ...