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Pallabi Goswami; A Novel Approach to Develop Highly Active n-Doped TiO2 Photocatalysts Based on Properties of nitrogen Precursor; Advanced NanoMaterials and Technologies for Energy Sector; 2017:1(1):55-72
This paper reports the preparation of N-doped TiO2 nanocrystals with an average of size ca. 9.8 nm synthesized by a controlled sol–gel reaction followed by calcinations at 400 0C. Triethylamine, triethanolamine, diisopropylamine were used to dope titania with nitrogen. By coupling structural (by X-ray diffraction, RAMAN spectra) and morphological (HRTEM, BET) characterizations with spectroscopic analyses (EPR and XPS), it was found that the nature of the nitrogen precursor affect photocatalytic behaviour of the synthesized nitrogen doped titania nanoparticles. The photocatalytic efficiency of a TiO2 photocatalyst depends not only on the electronic properties of the materials. The availability of active sites on the material surface also plays a major role in the ability of the photocatalytic material to degrade organic contaminants. Nitrogen precursor with large surface area possesses more surface hydroxyl groups and hence produces more photoactivity. The photocatalytic activity was tested using a UV irradiation source with regard to decomposition of the dye fluorescein. In the case of fluorescein degradation the disappearance of the green colour was measured directly by means of fluorosence spectrophotometer. All N-doped samples produced a better removal of the dye fluorescein than the undoped and commercial samples.