Enhanced internal electric field in S-doped BiOBr for intercalation, adsorption and degradation of ciprofloxacin by photoinitiation
Li, Fan 1Li, Tong 1Xing, Xueci 1Fan, Wenhong 2Zhang, Lili 3Hu, Chun 2Jin, Yang2
扫码查看
点击上方二维码区域，可以放大扫码查看
作者信息
1. Guangzhou Univ
2. Beihang Univ
3. Chinese Acad Sci
折叠
Abstract
A photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method. X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory calculation revealed that S-BiOBr consisted of covalent [Bi2O2S](2+) layer and exchangeable bromide ions [Br-2](2-). The specific layered structure of S-BiOBr exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S](2+)--OOC-R complexes. Furthermore, the internal electric field enhanced by polarization effects in the [Bi2O2S](2+) layer was conducive to a lasting electron transfer in the dark condition after photoactivation. The electron of R-center dot radical derived from oxidizing [Bi2O2S]-OOC-R persistently migrated to the S-BiOBr surface and was trapped by O-2 to form O-2(center dot-), facilitating the degradation of CIP in the dark. Hence, the degradation of CIP could be realized by utilizing the R-center dot radical triggered through transient photoinitiation with low optical energy consumption.
Key words
S-doped BiOBr/Internal electric field/Intercalation and adsorption/Photo-initiated R-center dot radical/CIP degradation/OXYGEN VACANCIES/MICROSPHERES/NANOSHEETS/OXIDE/FACET/DECOMPOSITION/ACTIVATION
NSTL
Elsevier