Abstract
Sm-doped TiO2 powders with different Sm loadings (0.7–2 wt.%) were successfully synthesized via a simple hydrothermal method using commercial P25 TiO2 and self-synthesized TiO2 as initial TiO2 nanoparticles. Their physicochemical properties were investigated by means of powder X-ray analysis (PXRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), and nitrogen physisorption. Their photocatalytic activity was first assessed in the degradation and mineralization of aqueous solutions of antibiotics ciprofloxacin (CIP) and sulfamethoxazole (SMX) under simulated solar irradiation with the 1wt.% Sm-loaded catalysts being the most active. More than 90% of CIP was degraded within 30 min and more than 85% was mineralized within 6 h of the photocatalytic process by the best performing samples (> 60% and > 80% of SMX, respectively). Residual antibiotic activity tests confirmed that CIP solutions treated with Sm-doped TiO2 catalysts did not exhibit toxicity toward E.coli. The photocatalytic activity of Sm-TiO2 catalysts were also investigated in photocatalytic CO2 reduction in batch under 6 h irradiation of a 200 W Hg/Xe lamp. The maximum production of CH4 over the Sm-doped commercial P25 TiO2 and self-synthesized TiO2 was 81 ppm h−1 g−1 and 129 ppm h−1 g−1, respectively. The better photocatalytic performance of the latter could be ascribed to the well-developed specific surface area and better adsorption properties of the material.
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Acknowledgements
The authors would like to acknowledge the BMBF (Fördermaßnahme CO2-WIN, Förderkennzeichen 033RC024, PRODIGY) for funding, and Dr. Henrik Lund—for performing XRD measurements, Fabian Strunk—for performing XPS measurements, Dr. Katja Neubauer—for performing PZC measurements, Felix Lorenz—for performing surface area and pore size analysis, Dr. Armin Springer, Elektronenmikroskopisches Zentrum (EMZ) Rostock,—for performing SEM measurements.
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Kutuzova, A., Moritz, JO., Moustakas, N.G. et al. Performance of Sm-doped TiO2 in photocatalytic antibiotic degradation and photocatalytic CO2 reduction. Appl Nanosci 13, 6951–6966 (2023). https://doi.org/10.1007/s13204-023-02832-3
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DOI: https://doi.org/10.1007/s13204-023-02832-3