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The TiO2 (B) nano-belts with excellent performance prepared via alkaline stirring hydrothermal method and its application to remove 17α-ethynylestradiol

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Abstract

In this work, TiO2 (B) nano-belts were synthesized by hydrothermal method under stirring, and static conditions and preparation conditions were optimized. The prepared materials were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), photoluminescence spectroscopy (PL), and N2 adsorption/desorption measurement. The photocatalytic performance was evaluated by removing synthetic estrogen 17α-ethynylestradiol (EE2), which is the most potent endocrine-disrupting chemical. The results show that the TiO2 nano-belt possesses pure metastable monoclinic TiO2 (B) and has uniform nano-belt shape with 80~120-nm diameters and 62.904 m2 g−1 of specific surface area. Under the best optimal preparation conditions (0.5 g P25, 20 mL 10 mol L−1 NaOH, hydrothermal temperature 180 °C for 18 h under stirring, 400 °C calcination for 2 h), the TiO2 (B) has better catalytic activity with 100.00% removal rate towards 3 mg L−1 EE2 in 120 min. The removal rates of EE2 over catalyst which was prepared under static condition and P25 are 74.66% and 70.71%, respectively. The photocatalytic degradation rate constant of TiO2 (B) prepared under stirring condition (0.0379 min−1) is 4.51 times and 8.42 times than those of TiO2 prepared under static condition (0.0084 min−1) and P25 (0.0045 min−1). The excellent photocatalytic activity is mainly ascribed to longer one-dimensional nano-belt structure and effective suppression of photo-produced electron-hole.

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Funding

This work was financially supported by the Natural Science Foundation of China (No. 21767030), Natural Science Foundation of Yunnan Province (2016FB014), and Foundation of Education Bureau of Yunnan Province (2017ZZX087).

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Correspondence to Li Shu.

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Responsible editor: Suresh Pillai

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Luo, L., Xia, L., Tan, W. et al. The TiO2 (B) nano-belts with excellent performance prepared via alkaline stirring hydrothermal method and its application to remove 17α-ethynylestradiol. Environ Sci Pollut Res 26, 34018–34026 (2019). https://doi.org/10.1007/s11356-018-3122-8

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  • DOI: https://doi.org/10.1007/s11356-018-3122-8

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