Journal
MOLECULES
Volume 27, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/molecules27217292
Keywords
carbon quantum dots; photocatalysis; degradation; polycyclic aromatic hydrocarbons
Funding
- Guangdong Basic and Applied Basic Research Foundation [2020B1515020032, 2020B1515120022]
- Guangzhou Basic and Applied Basic Research Foundation [202201010440]
- National Natural Science Foundation of China [62074060, 22102058]
- Science and Technology Program of Guangzhou [2019050001]
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In this study, a S-scheme photocatalyst was optimized by loading carbon quantum dots (CQDs) during the synthetic process, resulting in successful conversion of PAHs to value-added chemicals. Experiments and theoretical calculations demonstrated the significant role of CQDs in TiO2/CQDs/CdIn2S4 towards photocatalysis.
Conversion of hazardous compounds to value-added chemicals using clean energy possesses massive industrial interest. This applies especially to the hazardous compounds that are frequently released in daily life. In this work, a S-scheme photocatalyst is optimized by rational loading of carbon quantum dots (CQDs) during the synthetic process. As a bridge, the presence of CQDs between TiO2 and CdIn2S4 improves the electron extraction from TiO2 and supports the charge transport in S-scheme. Thanks to this, the TiO2/CQDs/CdIn2S4 presents outstanding photoactivity in converting the polycyclic aromatic hydrocarbons (PAHs) released by cigarette to value-added benzaldehyde. The optimized photocatalyst performs 87.79% conversion rate and 72.76% selectivity in 1 h reaction under a simulated solar source, as confirmed by FT-IR and GC-MS. A combination of experiments and theoretical calculations are conducted to demonstrate the role of CQDs in TiO2/CQDs/CdIn2S4 toward photocatalysis.
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