Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 237, Issue -, Pages 59-67Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.05.069
Keywords
Bi2O3/Bi2SiO5 heterojunction; Photocatalysts; beta-Bi2O3
Funding
- National Natural Science Foundation of China [21577132, 21777080]
- Fundamental Research Funds for the Central Universities [2652015225]
- Students Innovation and Entrepreneurship Training Program 2017 of China University of Geosciences Beijing [201711415025]
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In this work, Bi2O3/Bi2SiO5 p-n heterojunction photocatalyst was successfully fabricated via a facile one-step synthesis using Bi(NO3)(3) and nano-SiO2 as precursors. With the increasing amount of SiO2, alpha-Bi2O3 gradually transferred into beta-Bi2O3, and Bi2O3/Bi2SiO5 p-n heterojunction was obtained at the same time. The as-prepared samples were systematically characterized by XRD, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS). The Bi2O3/Bi2SiO5 heterojunction photocatalysts exhibited higher photocatalytic activity than alpha-Bi2O3 on the degradation of organic pollutants under simulated sunlight irradiation. The enhanced photocatalytic activity could be ascribed to the larger specific surface area, the larger contact angle, the formation of beta-Bi2O3 and construction of p-n heterojunction. More importantly, the phase transition mechanism of Bi2O3 in Bi2O3/Bi2SiO5 heterojunction photocatalyst was proposed, which is significant for the theoretical study and application of photocatalytic materials.
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