نتایج جستجو برای: poly aromatic hydrocarbon

تعداد نتایج: 138777  

Journal: :Environmental science & technology 2004
Jackie M Aislabie Megan R Balks Julia M Foght Emma J Waterhouse

Antarctic exploration and research have led to some significant although localized impacts on the environment. Human impacts occur around current or past scientific research stations, typically located on ice-free areas that are predominantly soils. Fuel spills, the most common occurrence, have the potential to cause the greatest environmental impact in the Antarctic through accumulation of ali...

2014
Frederick F. Becker Bimal K. Banik

Synthesis of a new methoxy dibenzofluorene through alkylation, cyclodehydration and aromatization in a one-pot operation is achieved for the first time. Using this hydrocarbon, a few derivatives are prepared through aromatic nitration, catalytic hydrogenation, coupling reaction with a side chain and reduction. The benzylic position of this hydrocarbon with the side chain is oxidized and reduced...

Journal: :Journal of UOEH 2013
Kanae Bekki Akira Toriba Ning Tang Takayuki Kameda Kazuichi Hayakawa

Polycyclic aromatic hydrocarbons (PAHs) are included in various environmental pollutants such as airborne particles and have been reported to induce a variety of toxic effects. On the other hand, PAH derivatives are generated from PAHs both through chemical reaction in the atmosphere and metabolism in the body.PAH derivatives have become known for their specific toxicities such as estrogenic/an...

2011
C. Boersma C. W. Bauschlicher A. Ricca A. L. Mattioda E. Peeters A. G. G. M. Tielens L. J. Allamandola

The far-IR characteristics of astrophysically relevant polycyclic aromatic hydrocarbons (PAHs) averaging in size around 100 carbon atoms have been studied using the theoretical spectra in the NASA Ames PAH IR Spectroscopic Database. These spectra were calculated using density functional theory. Selections of PAH species are made, grouped together by common characteristics or trends, such as siz...

2005
PAUL M. WHITE DUANE C. WOLF GREGORY J. THOMA CHARLES M. REYNOLDS

Phytoremediation uses plants and their associated microorganisms in conjunction with agronomic techniques to remove or degrade environmental contaminants. The objective of the field study was to evaluate the effect of vegetation establishment plus fertilizer addition on the biodegradation of alkylated polycyclic aromatic hydrocarbons in a crude oil-contaminated soil. Four replications of the fo...

Journal: :journal of the iranian chemical research 0
khalil faghihi organic polymer chemistry research laboratory, department of chemistry, faculty of sciences, arak university, arak, iran mohammad jalalian department of chemistry, islamic azad university, saveh branch, saveh, iran

five new aromatic poly(amide-imide)s (5a-e) were synthesized by direct polycondensationreaction of n-(4-carboxy phenyl) trimellitimide (3) with five aromatic diamines (4a-e) by usingtriphenyl phosphite in n-methyl-2-pyrrolidone (nmp) and pyridine at solution containingdissolved cacl2. all of the polymers were obtained in quantitative yields with inherentviscosities between 0.29-0.40 dl/g. the r...

Journal: :Journal of The Electrochemical Society 2021

Polymer electrolyte fuel cell (PEFC) membranes are subject to radical-induced degradation. Antioxidant strategies for hydrocarbon-based ionomers containing aromatic units can focus on intermediates that formed upon attack by hydroxyl radicals (HO · ). Among the different intermediates, cation radical P ·+ is most promising target repair, example cerium(III). For “repair” reaction of Ce(III) wit...

Journal: :Chemical communications 2007
Snehadrinarayan Khatua Debesh R Roy Pratim K Chattaraj Manish Bhattacharjee

A unique 1-D chain of sodium cluster containing (Na6) rings stabilized by a molybdenum containing metalloligand has been synthesized and characterized and the DFT calculations show striking resemblance in their aromatic behaviour with the corresponding hydrocarbon analogues.

Journal: :Chemical Engineering Research & Design 2022

This work addresses enhanced benzene, toluene and xylene (BTX) production by catalytic fast co-pyrolysis from agroindustrial biomass blended with PVC the use of prepared NaZSM-5 HZSM-5. Results pyrolysis indicates that oxygen-containing compounds decreased whereas aromatics increased. The effect mineral content altered intermediates increasing formation mono-aromatics while reducing poly-aromat...

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