Abstract
A novel approach to synthesize porous Au/TiO2 nanocomposites has been achieved through a pyrolytic strategy by employing NH2-MIL-125(Ti) as a TiO2 precursor, and photo-deposition of Au nanoparticles (NPs) onto porous nanocrystalline TiO2 with varying Au contents (0.05–0.5%). TEM images of Au/TiO2 nanocomposites showed that TiO2 particles were spherical structures, highly dispersed, and homogeneous with diameters of 10–15 nm, and Au NPs (20–30 nm) were anchored onto porous TiO2 matrices with a uniform distribution. The synthesized Au/TiO2 nanocomposites were assessed through the degradation of two antibiotic models, metronidazole (MNZ), and trimethoprim (TMP), under visible light and compared with undoped TiO2 and commercial TiO2 (P-25). The synthesized Au/TiO2 photocatalyst revealed enhanced photocatalytic performance in the mineralization (80%) and degradation (100%) of MNZ and TMP in both water matrices compared to undoped TiO2 (60%, 76%) and commercial P-25 (48%, 65%). The obtained 0.1% Au/TiO2 nanocomposite could complete the mineralization of TMP and MNZ with rate constant values (4.47 × 10−3 min−1 and 5.23 × 10−1 min−1) owing to the large well-developed porosity and high surface area of TiO2 and the small size of Au NPs with high dispersity, surface plasmon resonance, and stability. The recyclability of the 0.1% Au/TiO2 nanocomposite exhibited high durability without the leaching or loss of photocatalytic performance after four cycles. Complete degradation was achieved within 100 min in the water matrix from real wastewater, indicating promising results for the degradation of pharmaceuticals in the different water matrices. The present work opens a new route to synthesize low-cost, effective, and high photocatalytic performance nanocomposites with a small Au content as a cocatalyst onto semiconductor materials.
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Acknowledgements
M. E. thanks the college of the graduate student at Kuwait University for granting her funds for a master thesis scholarship.
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This project was funded by the college of the graduate student at the Kuwait University.
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M. Alsaidi, and Fadhel A. Azeez: conceptualization, project administration, investigation, and methodology. Fadhel A. Azeez and L. A. Al-Hajji: funding acquisition. M. Alsaidi and Adel. A. Ismail: writing — original draft, investigation, and formal analysis, data curation, writing — review and editing, supervision.
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Alsaidi, M., Azeez, F.A., Al-Hajji, L.A. et al. Hierarchical porous TiO2 with a uniform distribution of anchored gold nanoparticles for enhanced photocatalytic efficiency and accelerated charge separation for the degradation of antibiotics. Environ Sci Pollut Res 30, 17951–17964 (2023). https://doi.org/10.1007/s11356-022-23249-5
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DOI: https://doi.org/10.1007/s11356-022-23249-5