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Abstract
In this work, a simple and cost effective two step anodization method is used to prepare Magnesium doped TiO2 nanotubes (Mg-TONTs) which demonstrate superior photocatalytic performance. Room temperature (28 °C) crystallization of well alligned TONTs is achieved by Mg doping within a record time of 10 s whereas undoped samples prepared at 28 °C are amorphous. Mg-TONTs possess a photocatalytic degradation rate of 0.006/min which is 5 times higher than that by undoped amorphous TONT (0.0015/min) for the degradation of the organic pollutant methylene blue. The samples are morphologically, structurally, compositionally as well as optically characterised by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectrometer (DRS). FESEM reveal perfect tubular structure even after Mg doping with no Mg overlayer at the top of the tube. XRD and TEM confirm the polycrystalline nature of the tube and attainment of room temperature crystallization with a prominent peak at 25.100 and 47.80° in the former. XPS peak at ∼1303.5 eV corresponding to Mg1s confirms the formation of Mg bonding in the compound. The optical study indicates a decrease in the band gap of the doped sample that enables visible photon absorption that contributes to the enhanced photocatalytic activity.
Published Version
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