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Facile synthesis of quantum dots/TiO2 photocatalyst with superior photocatalytic activity: the effect of carbon nitride quantum dots and N-doped carbon dots


The graphitic carbon nitride quantum dots (CNQDs) and N-doped carbon quantum dots (N-CQDs) could be prepared by the same raw material and synthetic method. In this study, CNQDs and N-CQDs with the same QY (ca. 40%), functional group, emission peak and similar particle size, but nitrogen functional group content, were synthesized via a simple hydrothermal approach using ammonium citrate with and without urea. Their different effects on the photodegradation property of TiO2 were investigated via the synthesis of a series of TiO2/QDs samples through hydrothermal treatment, and the TiO2/QDs composite was comprehensively characterized. Compared with pure TiO2, the photocatalytic efficiency of organic pollutants with TiO2 was enhanced by incorporation of QDs. Loading CNQDs on TiO2 can improve the generation of ·O2 radicals, and N-CQDs can increase the production of ·OH of TiO2. Therefore, the photocatalytic performance of the two composites to pollutants is different.

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This work was carried out with the financial support received from the Natural Science Foundation of China (21875192), Outstanding Youth Science and Technology Talents Program of Sichuan (19JCQN0085), and Open Project of State Key Laboratory of Environment-friendly Energy Materials (20fksy16).

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Zhao, P., Jin, B., Zhang, Q. et al. Facile synthesis of quantum dots/TiO2 photocatalyst with superior photocatalytic activity: the effect of carbon nitride quantum dots and N-doped carbon dots. Res Chem Intermed 47, 5229–5247 (2021).

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  • Graphitic carbon nitride dots
  • N-doped carbon dots
  • Photodegradation efficiency