期刊
CHEMOSPHERE
卷 288, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132392
关键词
Graphitic carbon nitride; Core-shell structure; Visible light photocatalyst; TiO2; N-doping
资金
- University of Tehran
- Iran National Science Foundation (INSF) [97018151]
Designing an advanced nanostructure semiconductor is an effective strategy to enhance charge separation and improve photocatalytic activity. Surface deposition of core shell nanoparticles on g-C3N4 can significantly enhance photocatalytic performance, with nitrogen-doped hollow carbon spheres playing a crucial role in improving dispersion of TiO2 nanoparticles and enhancing charge separation. Optimal content of core shell nanoparticles demonstrates a solar-driven photocatalytic degradation efficiency of approximately 85%.
Designing an advance nanostructure semiconductor is an efficient strategy to promote the charge separation and thus improve the photocatalytic activity. Herein, a relatively high recombination rate of electron-hole pairs and low specific surface area of g-C3N4 (GCN) were subjected to the surface deposition of the core shell nanoparticles composed of nitrogen doped hollow carbon spheres (N-HCSs) as the supporting scaffold and TiO2 nanoparticles as the photoactive layer. The ternary composites with different TiO2@N-HCS content were prepared through a simplified nanocasting method followed by the two consecutive hydrothermal process. The effects of nitrogen doping in carbon framework, and nanoparticles amount were evaluated on the photocatalytic ability through the photodegradation of tetracycline (TC) molecules under the visible light irradiation. At the optimum content of core shell nanoparticles (7 wt%), the solar-driven TC photocatalytic degradation for ternary composite was approximately 85%, which was much better (about three times) than that of the pure GCN. More interestingly, the experimental results revealed that doping of nitrogen atoms has a positive role on the charge separation and the resulting photocatalytic efficiency. The employed hollow carbon spheres here play three important roles: (1) providing a substrate to uniformly dispersion of TiO2 nanoparticles without any aggregation; (2) reducing the combination of charge carriers and improving the separation of photoinduced carriers; (3) formation of larger surface area and more active sites on the photocatalyst surface. Furthermore, the underlying photocatalytic degradation mechanism was introduced by the controlled experiments using photoluminescent and radical scavenger tests.
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