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Photocatalytic Activity of Phosphorus and Nitrogen Co-Doped Carbon Quantum Dots/TiO₂ Nanosheets

Kailai Liu

College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China

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Fanmin Kong

Research Institute of Nanjing Chemical Industrial Group, Nanjing 210048, P. R. China

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Chaoqun Zhu

College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China

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, and

Guodong Jiang

https://orcid.org/0000-0002-5551-6384

College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China

E-mail Address: gdjiang@njtech.edu.cn

Corresponding author.

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https://doi.org/10.1142/S1793292020501519Cited by:12 (Source: Crossref)

Abstract

Double element co-doped carbon quantum dots (CQDs) have unique electron properties and broad prospects in photocatalysis. In this paper, the phosphorus and nitrogen co-doped CQDs (PNCQDs) were loaded on TiO₂ nanosheets by in-situ synthesis method. Physical structure and chemical composition of samples were analyzed by XRD, FT-IR, XPS, SEM and TEM. UV–Vis spectra show the donor–acceptor coupling between PNCQDs and TiO₂ and enhanced strong UV light absorption. Photoluminescence spectra indicate that PNCQDs effectively promote charge separation, which is different from nitrogen doped CQDs. The sample 1-PNCT with the optimal phosphorus doping amount has the highest kinetic constant for photodegradation of Methylene Blue (MB), which is 3.4 times pure TiO₂. A possible Z-scheme photodegradation mechanism is proposed according to the active species scavenge experiment results in which PNCQDs can not only accept but also localize photogenerated electrons to dopant sites due to the quantum wells created by P and N doping energy barriers.

Keywords:

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