Abstract
Removal of antibiotics detected in wastewater or natural aquatic systems by regular municipal treatment is challenging. Photocatalysis is considered to be the most well-known and green strategy for such removal. However, the catalytic efficiency is restricted by UV radiation dependence, fast electron-hole recombination, and low porosity/surface area of the photocatalyst. In this study, we have developed a highly porous anatase TiO2-polymethylsilsesquioxane (PMSQ) aerogel with nonmetal carbon dopant, which can simultaneously enhance the adsorption ability and visible light photo-activity. And tetracycline hydrochloride (TCH) was selected as a model antibiotic. A high surface area (747 g cm−3) C-TiO2-PMSQ aerogel can remove 91% TCH within 180 min under visible light. But the removal needs to be in an isopropyl alcohol/water co-solvent, due to the intrinsic hydrophobicity of PMSQ. After a heat treatment under 400°C, the surface area of C-TiO2-PMSQ aerogel decreases to 618 g cm−3, and the sample loses its hydrophobicity, the removal of TCH can be in aqueous condition and the efficiency increases to 98%. Moreover, both catalysts can be recycled 7 times and still maintain high removal efficiency (85 and 64% remained for hydrophobic and hydrophilic gels, respectively).
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HX acknowledges the financial support from Science and Technology Plan Project of Liaoning Province (Project: 2013225021).
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Xu, H., Ding, Y., Yang, S. et al. Carbon-doped titania-polymethylsilsesquioxane aerogels for the photocatalytic degradation of antibiotics. Bull Mater Sci 44, 226 (2021). https://doi.org/10.1007/s12034-021-02510-6
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DOI: https://doi.org/10.1007/s12034-021-02510-6