The photo-catalytic degradation of a textile azo-dye as Methyl Orange was studied in an innovative unit constituted by channel over which layer titanium dioxide (TiO2) catalyst anatase form deposited and activated UVB irradiation. kinetics were followed after variation the chemical, physical, hydraulic/hydrodynamic parameters system. For this purpose, influence TiO2 dosage (g/cm3), dye concentr...

Methyl oleate, an example of a FAME (fatty acid methyl ester), was produced by oleic (OA) photoesterification with TiO2 and UVA light. Different parameters were evaluated optimised: catalyst pretreatment, temperature (25–65 °C), loading (1–30 % w/wOA) : alcohol molar ratio (1 3–1 55). Response surface quadratic methodology obtained central composite rotational design (RSM-CCRD) used to evaluate...

The oxidation kinetics of a-CHx overcoats during exposure to oxygen and water vapor have been measured using X-ray photoemission spectroscopy (XPS) in an apparatus that allows oxidation and analysis of freshly deposited a-CHx overcoats without prior exposure of the overcoats to air. The uptake of oxygen on the surfaces of the a-CHx overcoats has been measured at O2 and H2O pressures in the rang...

The activated carbon-supported TiO2 nanoparticles (TiO2/AC) were prepared by a properly controlled sol-gel method. The effects of activated carbons (AC) support on inactivated properties of TiO2 nanoparticles were evaluated by photocatalytic inactivation experiments of Escherichia coli. The key factors affecting the inactivation efficiency were investigated, including electric power of lamp, te...

Carbon capture and utilisation is one of the most promising techniques to minimize the impact of the increasing amount of carbon dioxide in the atmosphere. Recently, the mineral greigite was shown to be capable of catalysing CO2 conversion, leading to useful small organic molecules. Here, we have carried out a systematic study of the adsorption and selective reduction of CO2 on the Fe3S4{111} s...

The activity of truncated octahedral Pt38 clusters as a catalyst in the oxygen reduction reaction (ORR) is investigated via first-principles simulations. Three catalytic steps: O2 dissociation (O2ads → 2Oads), O hydration (Oads + H2Oads → 2OHads), and H2O formation (OHads + Hads → H2Oads) are considered, in which all reactant species are co-adsorbed on the Pt38 cluster according to a Langmuir–H...

Low-temperature β-BiNbO4 powders (denoted as Low-β) were prepared by citrate and Pechini methods using homemade water-soluble niobium precursors. The addition of ethylene glycol and the resultant polymerization effect on the synthesis and visible-light photocatalytic performance of β-BiNbO4 powders were fully investigated. The polymerization effect is beneficial to lower the phase formation tem...

Hydroxyl and other oxygen-containing radicals are known to be present during the degradation of organic water pollutants in illuminated TiO2 photocatalyst slurries. It is proposed that the hydroxyl radical, OH., is the primary oxidant in the photocatalytic system. Four possible mechanisms are suggested, all based on OH. attack of the organic reactant. The cases of reaction on the surface, in th...

The crosslinked gelatin/CuS/PVA nanocomposite catalyst prepared using gamma irradiation as initiator was extensively characterized using several techniques including transmission electron microscopy (TEM), UV-Vis spectroscopy, infrared spectroscopy (IR) and X-ray diffraction (XRD). We chose Rhodamine B (RhB) dye as a model contaminant in order to investigate its Photocatalytic activity under so...

The H2O splitting mechanism is a very attractive alternative used in electrochemistry for the formation of O3. The most efficient catalysts employed for this reaction at room temperature are SnO2-based, in particular the Ni/Sb-SnO2 catalyst. In order to investigate the H2O splitting mechanism density functional theory (DFT) was performed on a Ni/Sb-SnO2 surface with oxygen vacancies. By calcula...