The comparative study of two kinds of β-Bi2O3/TiO2 binary composite and their removal of 17ɑ-ethynylestradiol

• Published in: Environmental science and pollution research international Vol. 27; no. 20; pp. 24692 - 24701
• Main Authors: Shi, Miao, Luo, Lijun, Dai, Jianhui, Xia, Lihong, Long, Junhong, Yang, Wenrong, Wang, Hongbin, Shu, Li
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2020; Springer Nature B.V
• Subjects: Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Bismuth oxides; Bismuth trioxide; Catalytic activity; Charge transfer; Comparative studies; Composite materials; Earth and Environmental Science; Ecotoxicology; Electron microscopy; Environment; Environmental Chemistry; Environmental Health; Environmental science; Fluorescence; Fluorescence spectroscopy; Free radicals; Heterojunctions; Hydrothermal treatment; Infrared analysis; Infrared spectroscopy; Microscopy; Nanosheets; Photocatalysis; Photoelectron spectroscopy; Photoelectrons; Recent Advances and Novel Concepts in Environmental Technologies; Scanning electron microscopy; Spectrum analysis; Titanium; Titanium dioxide; Transmission electron microscopy; Waste Water Technology; Water Management; Water Pollution Control; X ray photoelectron spectroscopy; X-ray diffraction; TiO; 17ɑ-Ethynylestradiol; β-Bi; Photocatalysis; O
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-019-06348-8

In this work, we used TiO 2 nanobelts and P25 particles as titanium sources to combine with β-Bi 2 O 3 to form β-Bi 2 O 3 /TiO 2 and β-Bi 2 O 3 /P25 composites. The prepared samples were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), and UV-vis absorbance spectroscopy and fluorescence spectroscopy. The structure and performance of two composites were comparatively investigated, and the β-Bi 2 O 3 molar ratios in them were optimized and their roles in them were studied. The results showed that the TiO 2 nanobelts and commercial TiO 2 (P25) particles combined with β-Bi 2 O 3 nanosheets. The optimal molar ratios of Bi to Ti element in two kinds of composites are 1:1. The β-Bi 2 O 3 in P25/β-Bi 2 O 3 makes more contribution to the improvement of photocatalytic activity of them than that in β-Bi 2 O 3 /TiO 2 because P25 particles are distributed on β-Bi 2 O 3 nanosheet more uniformly. The photocatalytic activities of β-Bi 2 O 3 /TiO 2 (0.02275 min −1 ) and β-Bi 2 O 3 /P25 (0.02382 min −1 ) are 3.72 times and 3.90 times than that of pure β-Bi 2 O 3 (0.0061 min −1 ) for EE2 removal. The enhanced photocatalytic activities of two kinds of composites are ascribed to photo-induced interfacial charge transfer on the heterojunction between β-Bi 2 O 3 and TiO 2 or P25. From the economic view, β-Bi 2 O 3 /P25 composites are better than β-Bi 2 O 3 /TiO 2 because TiO 2 nanobelts in the β-Bi 2 O 3 /TiO 2 composite are obtained from P25 via extra hydrothermal treatment in strong alkaline environment. The free radical capture experiment indicated that the dominant reactive species are h + and •O − 2 for EE2 removal by TiO 2 /β-Bi 2 O 3 and P25/β-Bi 2 O 3 composites.