Synthesis and Photocatalytic Activity of α-Bi2O3 Nanotubes/Nitrogen Doped Carbon Quantum Dots Hybrid Material†

doi:10.7503/cjcu20170663

Abstract

Abstract:

The α-Bi₂O₃ nanotubes/nitrogen doped carbon quantum dots(α-BO/N-CQDs) hybrid materials were synthesized by one-step hydrothermal method and characterized by means of XRD, SEM, TEM and UV-visible diffuse-reflectance spectrum(UV-Vis DRS). The results show that ammonium citrate converted into nitrogen doped carbon quantum dots(5—8 nm) through low temperature hydrothermal process and the α-BO/N-CQDs nanocomposites were obtained after introducting bismuth source. Results of TEM and FTIR confirm that the α-Bi₂O₃ nanotubes and N-CQDs had a better combination. Although the introduction of carbon quantum dots led to a slight decrease of the specific surface area of α-Bi₂O₃ nanotubes, it enhanced the absorption capacity. The photocatalytic activities were evaluated for the degradation of RhB solution. The results demonstrate that α-BO/N-CQDs possessed great photocatalytic activities, after irradiating for 180 min, the degradation rate of RhB reached 86%.

Key words: α-Bi2O3 Nanotube, Nitrogen doped carbon quantum dots, Low temperature hydrothermal synthesis, Photocatalysis

CLC Number:

O614

TrendMD:

HUA Chenghe, MA Hongchao, DONG Xiaoli, ZHANG Xiufang. Synthesis and Photocatalytic Activity of α-Bi₂O₃Nanotubes/Nitrogen Doped Carbon Quantum Dots Hybrid Material^†[J]. Chem. J. Chinese Universities, 2018, 39(2): 200.

Figures/Tables 9

Fig.1 XRD patterns of α-Bi2O3 and α-BO/N-CQDs samples with different N-CQDs contents^a. α-Bi2O3; b. α-BO/N-CQDs-1%; c. α-BO/N-CQDs-2%; d. α-BO/N-CQDs-4%; e. N-CQDs.

Fig.2 SEM images of α-Bi2O3 sample

Fig.3 TEM images of N-CQDs(A, B), α-Bi2O3(C, D) and α-BO/N-CQDs-2%(E, F)

Fig.4 N2 adsorption-desorption isotherms of α-Bi2O3(A) and α-BO/N-CQDs-2%(B)

Fig.5 FTIR spectra of α-Bi2O3(a), α-BO/N-CQDs-1%(b), α-BO/N-CQDs-2%(c) and α-BO/N-CQDs-4%(d)

Fig.6 UV-Vis diffuse reflection spectra of α-Bi2O3(a),α-BO/N-CQDs-1%(b), α-BO/N-CQDs-2%(c) and α-BO/N-CQDs-4%(d)

Fig.7 Photocatalytic degradation of RhB(A) and degradation profiles of RhB(B) in the presence of α-Bi2O3(a), α-BO/N-CQDs-1%(b), α-BO/N-CQDs-2%(c) and α-BO/N-CQDs-4%(d)

Fig.8 Photocatalytic stability of α-BO/N-CQDs-2% for degradation of RhB

Fig.9 Transient photocurrents-time plots of α-Bi2O3(a), α-BO/N-CQDs-1%(b), α-BO/N-CQDs-2%(c) and α-BO/N-CQDs-4%(d)

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Synthesis and Photocatalytic Activity of α-Bi₂O₃Nanotubes/Nitrogen Doped Carbon Quantum Dots Hybrid Material^†

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