Abstract
Visible-light (VL) photocatalysis has been regarded as an intriguing technology for the control of persistent environmental pollutants. In this study, the novel homogeneous Co doped-Bi/BiOBr nanocomposites (CB-X) were prepared via a facile one-step hydrothermal method, featured with a uniform 0D Bi nanodots distribution on 2D Co-doped BiOBr nanosheets, and the photocatalytic performance was evaluated by decomposing the BPA as a prototype contaminant. The degradation experiment indicated that the optimal CB-2 nanocomposite exhibited the best photocatalytic activity with a 94% removal efficiency of BPA under the VL irradiation of 30 min; And the corresponding apparent rate constant (k) was as high as 0.107 min−1, which was 10.7 times greater than that of Bi/BiOBr (0.010 min−1). Benefiting from the modulation effect of Co-doping on the intrinsic electron configuration of Bi/BiOBr, the elevated VL adsorption capacity and accelerated h+/e− pairs separation rate were achieved, which were evidenced by photoluminescence (PL) spectroscopy, photo-electrochemical measurements and density functional theory (DFT) calculation. Moreover, the major reactive species in CB-X/VL system were uncovered to be •O2− and 1O2, whereas •OH and h+ presented a secondary contribution in the BPA elimination. Finally, the possible photocatalytic mechanism involved in CB-X nanocomposites and BPA degradation pathways were proposed on the basis of the various intermediates and products detected by LC-MS/MS.
Original language | English |
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Article number | 136276 |
Journal | Chemosphere |
Volume | 308 |
DOIs | |
Publication status | Published - Dec 2022 |
Bibliographical note
Publisher Copyright:© 2022 Elsevier Ltd
Funding
The authors gratefully acknowledge the National Natural Science Foundation of China (Grant No. 22006022 ), Guangzhou Basic and Applied Basic Research Foundation (Grant No. 202102020348 ), and the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Grant No. HC202154 ). We would like to thank Analysis and Test Center of Guangdong University of Technology for UPLC analysis. The authors gratefully acknowledge the National Natural Science Foundation of China (Grant No. 22006022), Guangzhou Basic and Applied Basic Research Foundation (Grant No. 202102020348), and the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Grant No. HC202154). We would like to thank Analysis and Test Center of Guangdong University of Technology for UPLC analysis.
Funders | Funder number |
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National Natural Science Foundation of China | 22006022 |
Harbin Institute of Technology | HC202154 |
Guangdong University of Technology | |
State Key Laboratory of Urban Water Resource and Environment | |
Basic and Applied Basic Research Foundation of Guangdong Province | 202102020348 |
Keywords
- Bi nanodots
- Bismuth oxybromide nanosheet
- Bisphenol A
- Cobalt doping
- Visible-light photocatalysis