Abstract
Pulsed laser deposition facilitates the epitaxial deposition and growth of TiO2 at low temperature on hot substrate. In this study, nanosized nitrogen-doped TiO2 thin films were deposited on fabricated alumina disc-shaped and glass substrates. Textural properties of the fabricated disc and alumina disc-supported TiO2 were investigated using N2 adsorption–desorption isotherms, field emission scanning electron microscopy (FESEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. FESEM showed the presence of single crystals of TiO2 on the alumina disc. FTIR showed the presence of octahedral TiO2 and different hydroxyl groups on the surface which is responsible for the photoactivity and also showed the functional groups adsorbed on the catalyst surface after the photocatalytic degradation. The concentration of 2-chlorophenol and the photo-redox intermediate products as a function of irradiation time was determined. The concentration of the produced chloride ion during the photocatalytic degradation was determined by an ion chromatography. The results showed that the photocatalytic activity of the catalyst decreased upon cycling. The obtained results were compared with nanostructured TiO2 supported on glass substrate. Higher efficiency of 100% degradation was achieved for TiO2/Al2O3 catalyst, whereas about 70% degradation of 2-CP was achieved using TiO2/glass. Different photointermediates of 2-CP degradation have been identified for each cycle. The difference of intermediates is supported by the adsorbed fragments on the catalyst surface.
Highlights
Due to the rapid depletion of freshwater resources, there is an increase in the number of research in this area to meet the needs of pure drinking water for everyday activities
We focus on preparing immobilized nitrogen-doped TiO2 thin film prepared using pulsed laser deposition technique on a novel fabricated support as γ-alumina disc and evaluating these films for the environmental applications using 2-chlorophenol degradation as an example pollutant
We have compared the photocatalytic activity of TiO2/Al2O3 with TiO2 thin film supported on glass substrates
Summary
Due to the rapid depletion of freshwater resources, there is an increase in the number of research in this area to meet the needs of pure drinking water for everyday activities. There has been a marked increase in the number of research groups working in the field of desalination and wastewater treatment. One of the main components of waste materials in the oil industry is aromatic compounds.
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