Abstract
A low-cost and environmentally benign method is employed to prepare nitrogen (N) and sulfur (S) co-doped TiO2 (NSNT) using thiourea as a source for both N and S via microwave synthesis. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM-EDAX), transmission electron microscopy (TEM), UV–Vis absorption spectroscopy (UV–Vis, DRS), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) are used to characterize the sample. In this method, a significant decrease in the bandgap energy of NSNT is observed in contrast to that obtained from sol-gel and wet impregnation methods (2.89 eV and 2.68 eV, respectively). The experimental data obtained are in good agreement with DFT studies. The experimental confirmation of the enhanced photocatalytic performance of NSNT has been performed by the degradation of methylene blue (MB) under visible light, and the properties are compared with undoped TiO2 (NT) and nitrogen-doped TiO2 (NNT) synthesized via microwave method. This work suggests that the incorporation of N and S can be effectively tuned to obtain an excellent catalyst in the visible region for environmental applications.
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