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Luminescence properties of CQDs and photocatalytic properties of TiO2/ZnO/CQDs ternary composites

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Abstract

High-performance fluorescent carbon quantum dots (CQDs) prepared by hydrothermal method using citric acid and polyethyleneimine as raw materials. TiO2/ZnO/CQDs ternary composites were obtained by compositing different contents of CQDs with TiO2/ZnO. The phase structure, morphology, photocatalytic performance, and photocatalytic mechanism of ternary TiO2/ZnO/CQDs were investigated. The result shows that the CQDs synthesized by the hydrothermal method have good whole dispersibility, spherical shape, and particle size of 3–5 nm. When the hydrothermal time is 4 h and the hydrothermal temperature is 220 °C, the fluorescence luminescence performance of the prepared CQDs is the best. The prepared CQDs were loaded on the surface of TiO2/ZnO to form ternary TiO2/ZnO/CQDs photocatalysts. The results find that no other new phase is produced by the complex, and the TCZ-1 sample (When the amount of CQDs is 1 mL, the prepared ternary composite photocatalyst.) has a uniform grain size, with an average grain size of about 20 nm. CQDs can reduce the band gap bandwidth of TiO2/ZnO, and the polar hydrophilic functional groups of CQDs are displayed in the composite, which improves the photocatalytic performance and stability of TiO2/ZnO. TCZ-1 sample has the best photocatalytic performance, and the photocatalytic degradation rate of methylene blue (MB) solution is 96.7% within 90 min, and after 5 cycles of degradation, it drops to 80.2%, which is improved compared with zinc oxide catalyst.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 52272123), the National Key Basic Research and Development Project Subproject (Grant No. 2017YFC0703204), Science and Technology Project of Shaanxi Provincial Market Supervision Administration (Grant No. 2022KY20).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, People’s Republic of China

    Jiayan Guan, Xiangchun Liu, Ningna Bai, Fei Wang, Zhe Yang & Jie Zhang

  2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Feng Gao, Ping Zhang & Ziyao Wei

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  1. Jiayan Guan
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Contributions

JG: experiment, data analysis, manuscript writing; XL: guide the experiment, provide experimental conditions, modify the manuscript; NB: experiment, data arrangement; ZY: modify the manuscript; FW: data arrangement; FG: guide the experiment; PZ: guided the revision of the manuscript; ZW: experimental data collation.

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Correspondence to Xiangchun Liu or Feng Gao.

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Guan, J., Liu, X., Bai, N. et al. Luminescence properties of CQDs and photocatalytic properties of TiO2/ZnO/CQDs ternary composites. J Mater Sci: Mater Electron 34, 2169 (2023). https://doi.org/10.1007/s10854-023-11603-3

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