Several polysiloxanes (polydimethyl, polymethyloctadecyl or polymethyltetradecyl-siloxane) were studied by FTIR spectroscopy, densimetry and gel permeation chromatography. Different types of ageings such as thermal ageing (60°C and 100°C), photo-ageing (SEPAP) and acid vapour ageing were performed and compared. Oxidation, chain scission and cross-linking were estimated after ageings. The presen...

The photo-Kolbe reaction (electro-oxidation of acetate) on TiO2 in aqueous solution has been studied by means of a rotating ring-disk electrode (RRDE) with a TiO2 disk and Pt ring. The oxidation of acetate competes very efficiently with water for photogenerated holes on the illuminated n-TiO2 disk as shown by a decrease in the collection efficiency for oxygen reduction. No oxidation product of ...

Several advanced oxidation processes such as hydrogen peroxide photolysis, the Fenton treatment, photo-Fenton treatment, and ozonation combined with hydrogen peroxide and UVradiation for the destruction of 2,4-dinitrophenol were studied. Advanced oxidation processes, especially the Fenton treatment, were found to be effective for the degradation of 2,4-dinitrophenol and removal of toxicity. Acc...

Background & Aims of the Study: Phenolic compounds have been extensively used in industries for applications such as petrochemical, oil refineries, papers, plastics, steel, pharmaceuticals, textiles, coal conversion, and so on. Specified amounts of Phenolic compounds are lost in the process of their manufacturing and utilization and often cause environmental pollution problems....

BACKGROUND AND OBJECTIVES Methylene blue photo-inactivated plasma (MBPIP) has been reported to be less effective than fresh-frozen plasma (FFP) in the treatment of thrombotic thrombocytopenic purpura, which suggests a reduced content of the von Willebrand factor metalloprotease ADAMTS-13 in MBPIP. MATERIALS AND METHODS ADAMTS-13 activity and von Willebrand factor antigen (vWF:Ag) levels were ...

We adapt the computational hydrogen electrode approach to explicitly account for photo-generated charges and use it to computationally screen for viable catalyst/co-catalyst combinations for photo-catalytic water splitting. The hole energy necessary to thermodynamically drive the reaction is employed as descriptor for the screening process. Using this protocol and hybrid-level density-functiona...

These studies were planned as an extension of previous work (Mapson, 1961a) on investigations into the possible role of ascorbic acid and its oxidized forms as electron carriers in plant respiration, and the present investigation was also carried out with this object primarily in view. The results to be described in this paper suggest that the ascorbic acid system may function as an electrontra...

Assessment the efficiency of Fenton process (Fe 2+ /H2O2), versus photo-Fenton reaction (TiO2/Fe 2+ /H2O2/UV) for removal of Chloropyrifos, and COD from pesticide wastewater were investigated. Solar compound parabolic collectors (CPC) pilot scale with borosilicate tubes was used for photo-Fenton process. The effect of reaction time, initial pH and dosage of H2O2, FeSO4, TiO2 were studied for bo...