Journal
APPLIED SURFACE SCIENCE
Volume 562, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150214
Keywords
Photocatalysis; Separation efficiency; Point discharge effect; Oxygen vacancy; CQDs; BiOCI
Categories
Funding
- National Natural Science Foundation of China [51908432]
- Central Committee Guides Local Science and Technology Development Project of Hubei Province, China [2019ZYYD068, ZYYD2020000027]
- Education and Teaching Reform Research Project of the Teaching Instruction Sub-committee of Water Supply and Drainage Engineering Major by Ministry of Education [GPSJZW2019-32]
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The synthesis of a novel nanocomposite material has effectively enhanced photocatalytic performance, primarily due to the cooperative effect of point discharge induced by carbon quantum dots and the concentration of oxygen vacancies. This study provides a promising strategy to boost photoinduced carrier transfer properties.
Increasing the migration and separation efficiencies of photogenerated carriers can enormously enhance photocatalytic properties. Thus, a novel CQDs/BiOCl nanocomposite with rich oxygen vacancies (OVs) was effectively synthesized via a hydrothermal method by using maltitol as a carbon source to address these issues. The photocatalysts were characterized by XRD, SEM, TEM, FT-IR, BET, XPS, PL, EIS, I-t, DRS and ESR. The experimental results demonstrate that BOC-1 can purify 72% tetracycline hydrochloride (10 mg/L, TC-HCl) within 60 min, which is 4 times higher than pure BiOCl. Moreover, photocatalytic mechanism was thoroughly studied and verified that the cooperation of point discharge effect (PDE) and rational OVs concentration induced by carbon quantum dots (CQDs) can significantly enhance the migration and separation of photo-induced carriers, thereby leading to high photocatalytic activity of the as-prepared nanocomposites. In addition, the contribution of the free radicals was comprehensively calculated based on trapping experiments. the contributions of .OH, .O2- and 1O2 are 6.38%, 48.94% and 8.51%, respectively. This study provides a promising strategy to boosting the photoinduced carrier transfer properties by the coupling of point discharge effect and defect engineering.
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