期刊
NANOSCALE RESEARCH LETTERS
卷 14, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1186/s11671-019-3206-5
关键词
BiFeO3 nanoparticles; Carbon quantum dots; CQD/BiFeO3 composites; Photocatalysis
资金
- National Natural Science Foundation of China [51602170]
- Natural Science Foundation of Qinghai, China
- Youth Science Foundation of Qinghai Normal University [2019zr003]
In this work, the carbon quantum dot (CQD)-decorated BiFeO3 nanoparticle photocatalysts were prepared by a hydrothermal method. The TEM observation and XPS characterization indicate that the CQDs are well anchored on the surface of BiFeO3 nanoparticles. Acid orange 7 (AO7) and hexavalent chromium (Cr(VI)) were chosen as the model pollutants to investigate the photocatalytic/photo-Fenton degradation and photocatalytic reduction performances of the as-prepared CQD/BiFeO3 composites under visible and near-infrared (NIR) light irradiation. Compared with bare BiFeO3 nanoparticles, the CQD/BiFeO3 composites exhibit significantly improved photocatalytic and photo-Fenton catalytic activities. Moreover, the composites possess good catalytic stability. The efficient photogenerated charges separation in the composites was demonstrated by the photocurrent response and electrochemical impedance spectroscopy (EIS) measurements. The main active species involved in the catalytic degradation reaction were clarified by radicals trapping and detection experiments. The underlying photocatalytic and photo-Fenton mechanisms are systematically investigated and discussed.
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