Br-doping mediated band-gap engineering contributed Bi/Bi2O2CO3 nano-platelets with enhanced photocatalytic performance
Chenyu Wu, Huiru Zuo, Shengjie Zhao, Yanan Cheng, Zhiyuan Guo, Qishe Yan
Abstract
Photocatalyst modification by energy level engineering is of great significance for the generating of active free radical. In this work, a novel strategy was employed to construct Br-doped Bi 2 O 2 CO 3 followed by in situ reduction deposited Bi nanoparticles on the surface of Bi 2 O 2 CO 3 component. Therein, the doping of Br regulated the energy level structure of Bi 2 O 2 CO 3 . The characterization of SEM and TEM intuitively displayed the morphology changes among Bi 2 O 2 CO 3 , Br-Bi 2 O 2 CO 3 and Br-Bi/Bi 2 O 2 CO 3 in size and thickness, while XRD illustrated that the decrease in shape was consistent with the increase in the half-peak width of the Br-doped samples. The Tauc spectrum verified that the bandgap of Br-Bi/Bi 2 O 2 CO 3 nanosheets was obviously narrowed, and after Bi nanoparticles were deposited on the surface of Bi 2 O 2 CO 3 by in-situ reduction of Bi 3+ with glucose, the absorption of visible light was enlarged distinctively. Excitingly, the kinetic constant of Br-Bi/Bi 2 O 2 CO 3 sample was 7.22 times higher than that of Bi 2 O 2 CO 3 , showed excellent photocatalytic performance on degrading of tetracycline. The liquid chromatography-mass spectrometry (LC-MS) was employed to deduce the possible degradation routes, and then the toxicity of tetracycline and its degradation intermediates were analysed based on quantitative structure activity relationship (QSAR).