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CBrF 3 (Halon-1301) is a man-made ozone depleting substance that is a major source of bromine in the Earth’s stratosphere. Halon-1301 is predominantly removed from the atmosphere by UV photolysis in the stratosphere at wavelengths between 200 and 225nm. The existing level of uncertainty in the Halon-1301 UV absorption spectrum temperature-dependence directly impacts the ability to model stratospheric...
A novel composite was obtained in mild hydrothermal conditions using fly ash, TiO 2 and a cationic surfactant (HTAB). The components were involved in extensive re-structuring processes, evidenced by XRD, FT-IR, SEM, AFM, BET and surface energy measurements. The composite was used as adsorption substrate and as photocatalyst for the simultaneous removal of two commercial dyes (Bemacid Red,...
Pyranose 2-oxidase (P2O) from Trametes multicolor forms a homotetramer in which each of the subunits contains flavin adenine dinucleotide (FAD). The fluorescence of P2O decays with two lifetime components; a slow (358ps) and a fast (∼90fs) decay. The lifetime of the fast component is emission-wavelength dependent and is ascribed to fast photoinduced electron transfer (ET) from Trp168 to the excited...
This study investigated iron-mediated oxidative processes for the photochemical degradation of endosulfan, a chlorinated insecticide and central nervous system disruptor. At UV fluence of 360mJ/cm 2 , 52.4% and 32.0% removal of 2.45μM initial endosulfan was observed by UV/Fe 3+ and UV/Fe 2+ processes, respectively, at an initial concentration of 17.8μM iron. The degradation...
The possibility of intermolecular photoinduced ET (PET) is investigated in a novel donor–acceptor (D–A) system consisting of zinc tetraphenylporphyrin (ZnTPP) as donor and 2-nitrofluorene (2NF) as acceptor upon photoexcitation of the former moieties in polar solvent acetonitrile (ACN). The observed values (7.23×10 9 L/(mols) and 7.04×10 9 L/(mols)) of the fluorescence quenching rate...
A series of silicon(IV) phthalocyanines axially substituted with methylparaben, ethylparaben, propylparaben and butylparaben groups were synthesized and studied as photosensitizers for antimicrobial photodynamic therapy. The absorption, fluorescence, photodegradation and singlet oxygen generation properties of the synthesized Si(IV) phthalocyanines were studied. In vitro antibacterial photodynamic...
Reactive oxygen species (ROS) originating from the metabolism of molecular oxygen are a double-edge sword. Their involvement in various diseases is well documented, while they also serve essential signaling functions. In order to shed light on their biochemical role, chemical tools have been designed for ROS detection and production. This featured article describes and illustrates different photochemical...
A pH dependent encapsulation of dapoxyl sodium sulfonate (DSS), a charge transfer (CT) dye, with α- and β-cyclodextrin (CD), macrocyclic molecules made up with sugar units, has been performed using steady-state and time-resolved fluorescence measurements; both confirm the formation of an efficient inclusion complex with both non-protonated and protonated form of DSS. Moreover, the fluorescence intensity...
Dye-sensitized solar cells (DSSCs) have been the epicenter of attention for past few decades as a potentially cost-effective substitute for silicon-based solar cells. In DSSCs, the counter electrode (CE) plays a pivotal role in amassing electrons from the external circuit and catalyzing the I 3− reduction in the electrolyte. In this paper, the development of nickel sulfide (NiS) CEs for...
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