Abstract
Contamination of waters by pharmaceuticals is a major health issue. Therefore, there is a need for efficient techniques to remove pharmaceutical pollutants. Here, a photo-assisted fenton-like method based on sulfate radicals was tested using CaCu3Ti4O12 with different morphologies as catalyst. Sintering of CaCu3Ti4O12 at 775 °C for 6 h produced cubic structures with sizes from 2 to 5 μm, whereas sintering for 14 h produced microfibers, according to scanning electron microscopy. The highest electron paramagnetic resonance signal was observed for 6-h sintering. We evaluated the catalytic efficiency of CaCu3Ti4O12 for ibuprofen degradation with peroxymonosulfate under visible light. Results show that CaCu3Ti4O12 and 0.5 mM peroxymonosulfate under visible-light irradiation induced 91.8% removal of ibuprofen in 60 min. The Cu+ vacancy on the surface of CaCu3Ti4O12 is essential to activate the sulfate radicals by forming a Cu+–Cu2+ redox couple, which led to the rapid and efficient removal of ibuprofen.
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Acknowledgements
Financial support by the National Nature Science Foundation of China (Grant No. 21507157), the Science and Technology Project of Wenzhou (W20170012), the Startup Foundation for Advanced Talents of Shaanxi University of Science and Technology.
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Zhu, Y., Wang, T., Wang, W. et al. CaCu3Ti4O12, an efficient catalyst for ibuprofen removal by activation of peroxymonosulfate under visible-light irradiation. Environ Chem Lett 17, 481–486 (2019). https://doi.org/10.1007/s10311-018-0776-x
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DOI: https://doi.org/10.1007/s10311-018-0776-x