Journal
NEW JOURNAL OF CHEMISTRY
Volume 43, Issue 46, Pages 18355-18368Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj04860j
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Funding
- Henan Postdoctoral Foundation [1901019]
- Postdoctoral Daily Foundation of Henan Polytechnic University [712108/091]
- Tianchi Doctoral Program Foundation of Xinjiang Province
- General Postdoctoral Foundation of Xinjiang Province
- Science and Technology Project of Hami City [HM2019kj011]
- National Natural Science Foundation of China [U1361119, 21873025, 21571042, 21371040, 51603055]
- Natural Science Foundation of Henan Province [162300410115]
- Department Science Foundation of Henan Province [19A530002]
- Natural Science Foundation of Heilongjiang Province [QC2017055]
- Postdoctoral Foundation of Heilongjiang Province [LBH-Z15069]
- Postdoctoral Science Foundation of China [2015M580257]
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Here, we present a facile and green route to cleanly and efficiently utilize low-rank lignite to produce carbon quantum dots (CQDs) in high yields and in situ synthesize CQDs/TiO2 heterostructure nanocomposites. Unlike other CQDs, the lignite-derived CQDs exhibit obvious concentration-dependent red-shifted absorption, unusual aggregation-induced different color emissions and strong orange-red solid-state fluorescence. Through the optimization of the CQD loading proportion, the 2 wt% CQDs/TiO2 shows the optimal photocatalytic performance under visible light. We highlight the CQDs/TiO2 heterostructure nanocomposites by focusing on their dynamic photoinduced charge transfer properties triggered by the heterostructure interface and their application as a photocatalyst under visible light. Our detailed work about the transfer behavior of photoinduced charges in coal-derived carbon quantum dot/TiO2 heterostructure nanocomposites may shed light on the intrinsic reasons for CQD/semiconductor enhanced photocatalytic activity.
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