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

journal contribution
posted on 2020-07-01, 00:00 authored by Miao Shi, Lijun Luo, Jianhui Dai, Lihong Xia, Junhong Long, Wenrong YangWenrong Yang, Hongbin Wang, Li Shu
In this work, we used TiO2 nanobelts and P25 particles as titanium sources to combine with β-Bi2O3 to form β-Bi2O3/TiO2 and β-Bi2O3/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-Bi2O3 molar ratios in them were optimized and their roles in them were studied. The results showed that the TiO2 nanobelts and commercial TiO2 (P25) particles combined with β-Bi2O3 nanosheets. The optimal molar ratios of Bi to Ti element in two kinds of composites are 1:1. The β-Bi2O3 in P25/β-Bi2O3 makes more contribution to the improvement of photocatalytic activity of them than that in β-Bi2O3/TiO2 because P25 particles are distributed on β-Bi2O3 nanosheet more uniformly. The photocatalytic activities of β-Bi2O3/TiO2 (0.02275 min-1) and β-Bi2O3/P25 (0.02382 min-1) are 3.72 times and 3.90 times than that of pure β-Bi2O3 (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-Bi2O3 and TiO2 or P25. From the economic view, β-Bi2O3/P25 composites are better than β-Bi2O3/TiO2 because TiO2 nanobelts in the β-Bi2O3/TiO2 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 TiO2/β-Bi2O3 and P25/β-Bi2O3 composites.

History

Journal

Environmental Science and Pollution Research

Volume

27

Issue

20

Pagination

24692 - 24701

Publisher

Springer

Location

Berlin, Germany

ISSN

0944-1344

eISSN

1614-7499

Language

eng

Publication classification

C1 Refereed article in a scholarly journal