Fabrication of CNTs-Ag-TiO2 ternary structure for enhancing visible light photocatalytic degradation of organic dye pollutant

In order to improve the catalytic efficiency of titanium dioxide (TiO2) under visible light, TiO2 nanoparticles was composed with the silver-covered carbon nanotubes (CA) to form CNTs-Ag-TiO2 (CAT) ternary structure via in situ reduction combined with sol-gel method. The composite was characterized...

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Veröffentlicht in:Materials chemistry and physics 2020-07, Vol.248, p.122873, Article 122873
Hauptverfasser: Zhao, Chen, Guo, Jun, Yu, Chenlu, Zhang, Zhejuan, Sun, Zhuo, Piao, Xianqing
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Sprache:eng
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Zusammenfassung:In order to improve the catalytic efficiency of titanium dioxide (TiO2) under visible light, TiO2 nanoparticles was composed with the silver-covered carbon nanotubes (CA) to form CNTs-Ag-TiO2 (CAT) ternary structure via in situ reduction combined with sol-gel method. The composite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectra (DRS) and photoluminescence (PL) spectra. Using methylene blue (MB) as the model pollutant, photocatalytic activity of CAT was studied to investigate the influence of the composited amount of CA on the effect of photocatalysis. The results revealed that the photocatalytic activity of TiO2 under both visible light and UV light were improved by compositing with CA. When the mass ratio of CA is 15%, the degradation rare of methylene blue (MB) by CAT reached to 80.8% under visible light in 3 h, which is 16.5 times higher than that of TiO2. Accordingly, the degradation rate reached to 99.2% under UV light in 40 min, which is nearly twice as fast as that of TiO2. [Display omitted] •Research Highlights:•A facile procedure based on in-situ reduction method was developed to synthesize a uniformly coated CNTs-Ag-TiO2(CAT) ternary structure.•Ag nanoparticles were constructed between CNTs and TiO2 and served as a “bridge” in the CAT ternary structure, which exhibited an enhanced photocatalytic performance under visible light.•The detailed mechanism of silver as an intermediate layer has been clearly expounded based on the obviously improved photocatalytic efficiency.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.122873