Photochemical and Electrochemical Oxidation Reactions of Surface-Bound Polycyclic Aromatic Hydrocarbons

2004 ◽  
Vol 108 (3) ◽  
pp. 1038-1045 ◽  
Author(s):  
Maciej Mazur ◽  
G. J. Blanchard
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Electrochemical Oxidation ◽  
Aromatic Hydrocarbons ◽  
Oxidation Reactions ◽  
Polycyclic Aromatic

The influence of particle size and structure on the sorption and oxidation behaviour of birnessite: II. Adsorption and oxidation of four polycyclic aromatic hydrocarbons

2014 ◽  
Vol 11 (3) ◽  
pp. 279 ◽  
Author(s):  
Mario Villalobos ◽  
Manuel Carrillo-Cárdenas ◽  
Richard Gibson ◽  
N. Ruth López-Santiago ◽  
Jimmy A. Morales
Keyword(s):  
Particle Size ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Manganese Oxides ◽  
Organic Matter Content ◽  
Matter Content ◽  
Particle Sizes ◽  
Oxidation Reactions ◽  
Deep Aquifers ◽  
Polycyclic Aromatic

Environmental context Sorption and oxidation reactions at mineral surfaces can substantially influence the mobility and toxicity of environmental contaminants. An understanding of the factors that control these reactions is crucial for predicting the fate of contaminant species. We investigate the reactivity of manganese oxides towards polycyclic aromatic hydrocarbons, persistent organic compounds of environmental concern. Abstract Birnessites are ubiquitous components of natural systems and may exert a significant influence on the mobility and toxicity of different types of contaminants, including organic species. Their small particle sizes and internal structure provide them with high sorption capacities and oxidising abilities for redox sensitive species. In the present work, the interactions of two MnIV birnessites (δ-MnO2 and acid birnessite) of different particle sizes and layer vacancy contents were investigated with four hydrophobic polycyclic aromatic hydrocarbons (PAHs) of three and four rings. Fluorene and anthracene were oxidised to produce the corresponding and less toxic quinones by both birnessites, but at a higher rate and extent by δ-MnO2. Phenanthrene and fluoranthene only adsorbed to δ-MnO2 but not to acid birnessite. The higher reactivity of δ-MnO2 is only partly explained by its higher specific surface area (114 v. 39m2g–1), i.e. by its smaller particle size. The repulsive effect of water molecules from hydrated cations sorbed on layer vacant sites is most likely decisive, because acid birnessite shows a considerably larger content of these vacancies. The results presented provide a fundamental understanding of the potential influence of birnessite minerals on the attenuation of low molecular weight PAHs in environments with low organic matter content, such as deep aquifers.

Electrochemical oxidation of the polycyclic aromatic hydrocarbons in polluted concrete of the residential buildings

2017 ◽  
Vol 220 ◽  
pp. 393-399 ◽  
Author(s):  
Danka D. Aćimović ◽  
Slavko D. Karić ◽  
Željka M. Nikolić ◽  
Tanja P. Brdarić ◽  
Gvozden S. Tasić ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Electrochemical Oxidation ◽  
Aromatic Hydrocarbons ◽  
Residential Buildings ◽  
Polycyclic Aromatic

The Assessment of Contamination and Source of Polycyclic Aromatic Hydrocarbons from the Sediments of the Someş River

2019 ◽  
Vol 64 (1) ◽  
pp. 55-67
Author(s):  
Vlad Pӑnescu ◽  
◽  
Mihaela Cӑtӑlina Herghelegiu ◽  
Sorin Pop ◽  
Mircea Anton ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

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