AUTHOR=Cao Baowei , Gong Siwen , Zubairu Siyaka Mj , Liu Lingna , Xu Yunhua , Guo Lei , Dang Rui , Zhu Gangqiang 

TITLE=Fabrication of Er3+/Yb3+ Co-Doped Bi5O7I Microsphere With Upconversion Luminescence and Enhanced Photocatalytic Activity for Bisphenol A Degradation

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00773

DOI=10.3389/fchem.2020.00773

ISSN=2296-2646

ABSTRACT=<p>Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped Bi<sub>5</sub>O<sub>7</sub>I uniform porous microsphere photocatalysts were synthesized by a two-step chemical method, which possesses excellent photocatalytic performance and upconversion luminescence property. The photocatalytic performance of the photocatalysts was studied by degradation of bisphenol A in aqueous solution under visible light and different monochromatic light irradiation. The photocatalytic performance of Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped Bi<sub>5</sub>O<sub>7</sub>I sample is better than that of the pristine Bi<sub>5</sub>O<sub>7</sub>I and Er<sup>3+</sup>-doped Bi<sub>5</sub>O<sub>7</sub>I samples. Moreover, Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped Bi<sub>5</sub>O<sub>7</sub>I possesses photocatalytic ability with a red light monochromatic LED lamp (3 W, λ = 630 nm) and an infrared monochromatic LED lamp (100 W, λ = 940 nm) irradiation whose wavelength is longer than the absorption-limiting wavelength of pristine Bi<sub>5</sub>O<sub>7</sub>I sample. This phenomenon further verified that the upconversion property of Er<sup>3+</sup> and Yb<sup>3+</sup> causes the improved photocatalytic efficiency of Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped Bi<sub>5</sub>O<sub>7</sub>I sample.</p>