Kinetic Aspects of Benzene Degradation over TiO-N and Composite Fe/BiWO/TiO-N Photocatalysts under Irradiation with Visible Light.

In this study, composite materials based on nanocrystalline anatase TiO doped with nitrogen and bismuth tungstate are synthesized using a hydrothermal method. All samples are tested in the oxidation of volatile organic compounds under visible light to find the correlations between their physicochemical characteristics and photocatalytic activity. The kinetic aspects are studied both in batch and continuous-flow reactors, using ethanol and benzene as test compounds.

Visible-Light-Active N-Doped TiO Photocatalysts: Synthesis from TiOSO, Characterization, and Enhancement of Stability Via Surface Modification.

This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO through calcination in air at an increased temperature.

Enhanced Photocatalytic Activity and Stability of BiWO - TiO-N Nanocomposites in the Oxidation of Volatile Pollutants.

The development of active and stable photocatalysts for the degradation of volatile organic compounds under visible light is important for efficient light utilization and environmental protection. Titanium dioxide doped with nitrogen is known to have a high activity but it exhibits a relatively low stability due to a gradual degradation of nitrogen species under highly powerful radiation. In this paper, we show that the combination of N-doped TiO with bismuth tungstate prevents its degradation during the photocatalytic process and results in a very stable composite photocatalyst.

Method for correction of experimental action spectrum using actual overlapping spectra of radiation sources.

Experimental dependency of the photosystem's response on the wavelength of exciting radiation, also known as action spectrum, may be substantially affected by the spectrum shape of this radiation. This is especially important in the case, when different radiation sources are used for the investigation of action spectrum. For instance, too wide emission peaks of radiation sources can blur the scopes of actual action spectrum and distort information about the properties of photosystem at certain wavelength regions.