Citation: Wanni Wang, FuZhang, huanlingZhang, Yang Wang, Wei Tao, Shengheng, Haisheng Qian. TiO₂ composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis[J]. Chinese Journal of Catalysis, ;2017, 38(11): 1851-1859. doi: 10.1016/S1872-2067(17)62929-2 shu

TiO₂ composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis

Wanni Wang ^a, ,
FuZhang ^a ,
huanlingZhang ^b ,
Yang Wang ^c ,
Wei Tao ^a ,
Shengheng ^c ,
Haisheng Qian ^a

a School of Biological and Medical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
b School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
c Instrumental Analysis Center, Hefei University of Technology, Hefei 230009, China

Received Date: 5 July 2017
Revised Date: 17 September 2017

Fund Project: This work was supported in part by the National Natural Science Foundation of China (21471043, 21304028, 51403195, 31501576).

We report a colloidal process to coat a layer of TiO₂ onto SiO₂ composite nanofibers containing em-bedded CdS and upconversion nanoparticles (UCNPs). The SiO₂ composite nanofibers were fabri-cated by electrospinning. To improve the energy transfer efficiency, UCNPs and CdS nanoparticles were bound in close proximity to each other within the SiO₂ matrix. β-NaYF₄:Yb(30%),Tm(0.5%)@NaYF₄:Yb(20%),Er(2%) core-shell nanoparticles were used as na-notransducers for near infrared light. These nanoparticles exhibited enhanced upconversion fluo-rescence compared with β-NaYF₄:Yb(30%),Tm(0.5%) or β-NaYF₄:Yb(30%),Tm(0.5%)@NaYF₄ nanoparticles. The morphologies, size and chemical compositions have been extensively investi-gated using field emission scanning electron microscopy (FESEM), transmission electron microsco-py (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS), respectively. The TEM images showed that the TiO₂ composite nanotubes were embedded with a large amount of UCNPs and CdS nanoparticles. The composite TiO₂ nanotubes degraded more than 90% of rhodamine B (RhB) dye during 20 min of irradiation by simulated solar light. In particular, more than 50% of RhB was decomposed in 70 min, under irradiation of near infrared light (NIR). This high degradation was attributed to the full spectrum absorption of solar light, and the enhanced transfer efficiency for near infrared light. The as-prepared nanostructures can harness solar energy, and provide an alter-native to overcome energy shortages and environmental protection.
- TiO₂ nanotubes,
- Upconversion nanoparticles,
- Energy transfer,
- Photocatalysis,
- Nanotransducer
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TiO2 composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis

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TiO₂ composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis