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Lignite-derived carbon quantum dot/TiO2 heterostructure nanocomposites: photoinduced charge transfer properties and enhanced visible light photocatalytic activity

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Abstract

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.

Graphical abstract: Lignite-derived carbon quantum dot/TiO2 heterostructure nanocomposites: photoinduced charge transfer properties and enhanced visible light photocatalytic activity

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Publication details

The article was received on 25 Sep 2019, accepted on 30 Oct 2019 and first published on 05 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ04860J
New J. Chem., 2019, Advance Article

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    Lignite-derived carbon quantum dot/TiO2 heterostructure nanocomposites: photoinduced charge transfer properties and enhanced visible light photocatalytic activity

    J. Yu, C. Zhang, Y. Yang, G. Yi, R. Fan, L. Li, B. Xing, Q. Liu, J. Jia and G. Huang, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ04860J

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