scholarly journals Attempted characterisation of phenanthrene-4,5-quinone and electrochemical synthesis of violanthrone-16,17-quinone. How does the stability of bay quinones correlate with structural and electronic parameters?

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 38004-38012
Author(s):  
Dylan Wilkinson ◽  
Giacomo Cioncoloni ◽  
Mark D. Symes ◽  
Götz Bucher
Keyword(s):  
Cyclic Voltammetry ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Electrochemical Synthesis ◽  
Carbonyl Oxygen ◽  
Computational Work ◽  
Polycyclic Aromatic ◽  
Electronic Parameters ◽  
The Stability ◽  
Oxygen Atoms

Bay quinones have the carbonyl oxygen atoms in the bay region of polycyclic aromatic hydrocarbons. This study presents cyclic voltammetry and computational work helping to understand when bay quinones can be expected to be isolable, and when not.

scholarly journals Bioremediation of PAH-Contaminated Soils: Process Enhancement through Composting/Compost

2020 ◽  
Vol 10 (11) ◽  
pp. 3684 ◽  
Author(s):  
Tahseen Sayara ◽  
Antoni Sánchez
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Contaminated Soils ◽  
Low Cost ◽  
Polluted Soil ◽  
Ex Situ ◽  
Chemical Structures ◽  
Hydrophobic Chemical ◽  
Polycyclic Aromatic ◽  
The Stability

Bioremediation of contaminated soils has gained increasing interest in recent years as a low-cost and environmentally friendly technology to clean soils polluted with anthropogenic contaminants. However, some organic pollutants in soil have a low biodegradability or are not bioavailable, which hampers the use of bioremediation for their removal. This is the case of polycyclic aromatic hydrocarbons (PAHs), which normally are stable and hydrophobic chemical structures. In this review, several approaches for the decontamination of PAH-polluted soil are presented and discussed in detail. The use of compost as biostimulation- and bioaugmentation-coupled technologies are described in detail, and some parameters, such as the stability of compost, deserve special attention to obtain better results. Composting as an ex situ technology, with the use of some specific products like surfactants, is also discussed. In summary, the use of compost and composting are promising technologies (in all the approaches presented) for the bioremediation of PAH-contaminated soils.

scholarly journals Degradation of Anthracene by Immobilizing Laccase From Trametes Versicolor onto Chitosan Beads and Hyacinth Plant

2020 ◽  
Vol 31 (3) ◽  
pp. 14
Author(s):  
Ali A. Taha ◽  
Nahida J. Hameed ◽  
Farah Hamed Ali
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Trametes Versicolor ◽  
Free Enzyme ◽  
The Other ◽  
Chitosan Beads ◽  
Immobilized Laccase ◽  
Mediator System ◽  
Polycyclic Aromatic ◽  
The Stability

Polycyclic aromatic hydrocarbons (PAHs) are recognized as a toxic, mutagenic and/or carcinogenic compounds, and their pollution of soil and aquifer is of increasing environmentally risk. Laccases (E.C. 1.10.3.2) are phenoloxidases catalyze the oxidation of PAHs in the presence of a mediator compound and hyacinth plant. In this study laccase from Trametes versicolor was immobilized into chitosan, and the potential to oxidize anthracene in the presence of 1-hydroxybenzotriazole (HBT) was examined. Results indicated that the immobilization enhanced the stability of laccase against temperature, pH, inhibitors and loading time compared with the other cases. The immobilized laccase-mediator system was as efficient as the free enzyme for oxidizing the tested PAHs. After 24h. of incubation, immobilized laccase–HBT showed a system oxidization more than immobilized laccase without (HBT) of PAHs; Chitosan with hyacinth plant and (HBT) resulted better conversion than chitosan with or without HBT. These results indicate a new chance for applying the immobilized laccase in bioremediation.

Hydrogenated polycyclic aromatic hydrocarbons: isomerism and aromaticity

2020 ◽  
Vol 22 (38) ◽  
pp. 21968-21976
Author(s):  
Paula Pla ◽  
Yang Wang ◽  
Fernando Martín ◽  
Manuel Alcamí
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Simple Model ◽  
Aromatic Hydrocarbons ◽  
Relative Stability ◽  
Model Based ◽  
Adjacency Matrices ◽  
Polycyclic Aromatic ◽  
The Stability

A simple model based on adjacency matrices is introduced to study the stability of hydrogenated polycyclic aromatic hydrocarbons. Aromaticity governs their relative stability having the most stable isomers the higher number of non-hydrogenated rings.

scholarly journals Physical and Chemical Properties of Polycyclic Aromatic Hydrocarbons

1989 ◽  
Vol 135 ◽  
pp. 155-171
Author(s):  
S. Leach
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Interstellar Medium ◽  
Aromatic Hydrocarbons ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Polycyclic Aromatic ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

A review is presented of some physical and chemical properties of polycyclic aromatic hydrocarbons (PAHs) that are relevant for interpreting various aspects of observations and speculations on PAHs in the interstellar medium. The subjects discussed are: the stability and reactivity of neutral and ionic PAHs; the spectroscopy and photophysics of neutral and monocationic PAHs; the photostabilities of PAH monocations and dications and their astrophysical implications.

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