Hydrothermal Synthesis, Characterization and Photocatalytic Activities of Nanosheets-assembled Bi12SiO20 Microcubes†

doi:10.7503/cjcu20150413

Abstract

Abstract:

Novel nanosheet-assembled Bi₁₂SiO₂₀ microcubes were prepared via a facile hydrothermal synthesis approach. The phase and morphology of the product were characterized by X-ray diffraction, energy dispersive spectrometry, selected area electron diffraction, X-ray photoelectron spectrometry, high resolution transmission electron microscopy and scanning electron microscopy. Experimental results indicated that as-prepared Bi₁₂SiO₂₀ sample was assembled by many nanosheets. Some influencing factors including reaction time, temperature and the presence of additives(e.g., polyacrylamide, sodium citrate and sodium hydroxide) were revealed to play crucial roles in the generation of Bi₁₂SiO₂₀ nanoarchitecture. Moreover, the photocatalytic experiments indicated that the as-prepared Bi₁₂SiO₂₀ product exhibited excellent photocatalytic activities and the degradation rate of RhB could reach to 97.5% under the irradiation of UV-Vis light.

Key words: Hierarchical microcube, Semiconductor, Hydrothermal synthesis, Crystal growth, Photocatalytic activity

CLC Number:

O614

TrendMD:

ZHANG Xiang, ZHANG Lei, ZOU Yue, HUANG Xinhua, PAN Chengling, HOU Changmin, XU Jiqing. Hydrothermal Synthesis, Characterization and Photocatalytic Activities of Nanosheets-assembled Bi₁₂SiO₂₀ Microcubes^†[J]. Chem. J. Chinese Universities, 2015, 36(12): 2372.

Figures/Tables 10

Fig.1 XRD pattern(A) and EDS spectrum(B) of BSO hierarchical microcubes prepared at 150 ℃ for 24 h

Fig.2 XPS spectra of BSO hierarchical microcubes prepared at 150 ℃ for 24 h (A) Survey spectrum; (B) B i 4 f ; (C) S i 2 p ; (D) O 1 s .

Fig.3 Raman(A) and FTIR(B) spectra of hierarchical BSO microcubes prepared at 150 ℃ for 24 h

Fig.4 SEM(A, B), TEM(C and inset) and SAED(D) images of hierarchical BSO microcubes prepared at 150 ℃ for 24 h

Fig.5 SEM images(A—C) and XRD patterns(D) of the samples prepared in the absence of PAM and/or Na3Cit (A) and a. Without Na3Cit; (B) and b. without PAM; (C) and c. without PAM and Na3Cit.

Fig.6 SEM images(A, B) and XRD(C, D) patterns of the samples prepared at different reaction temperatures Reaction temperature/℃: (A), (C) 120; (B), (D) 180.

Fig.7 SEM images(A, B) and XRD patterns(C, D) of the samples prepared with different reaction time Reaction time/h: (A), (C) 12; (B), (D) 36.

Fig.8 DRS spectrum and the (αhν)2 -E plots(inset) of hierarchical BSO microcubes prepared at 150 ℃ for 24 h

Fig.9 Photodegradation efficiencies of RhB as a function of irradiation time with UV-Vis light a. Photolysis; b. BSO prepared without sodium citrate; c. BSO prepared without PAM; d. BSO hierarchical microcubes.

Fig.10 Photocatalytic degradation efficiencies of RhB with or without quenchers under UV-Vis light Irradiation time: 75 min.

References 40

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Hydrothermal Synthesis, Characterization and Photocatalytic Activities of Nanosheets-assembled Bi₁₂SiO₂₀ Microcubes^†

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