Fabrication ofultrafine ZnFe2O4 nanoparticles for efficient photocatalytic reduction CO2 under visible light illumination

doi:10.1016/j.jmst.2018.06.001

Abstract

Abstract:

A one-pot, solvent-thermal process was used to create the ultrafine ZnFe₂O₄ nanoparticles photocatalyst. During the solvent-thermal process, the in situ self-forming NaCl not only served as a “cage” to confine the ion diffusion, but also acted as a microreactor for nanocrystallite growth. An average particle size of ～10 nm and a high-specific surface area of ～112.9 m²/g were observed for the ultrafine ZnFe₂O₄ nanoparticles Owing to the synergistic effect of ultrafine particle size, the full utilization of the visible light region and high conduction band (CB) position, ultrafine ZnFe₂O₄ photocatalyst displayed an efficient photocatalytic CO₂ reduction under visible light illumination. Besides, the ultrafine ZnFe₂O₄ photocatalyst showed high production selectivity for CH₃CHO and C₂H₅OH generation in aqueous CO₂/NaHCO₃ solution. This work may provide a new idea for the synthesis of new high-efficiency photocatalysts.

Key words: Ultrafine nanoparticles, Photocatalytic CO₂ reduction, Visible light, ZnFe₂O₄ photocatalyst, In situ self-formed “cage”

Jun Xiao, Weiyi Yang, Shuang Gao, Caixia Sun, Qi Li. Fabrication ofultrafine ZnFe₂O₄ nanoparticles for efficient photocatalytic reduction CO₂ under visible light illumination[J]. J. Mater. Sci. Technol., 2018, 34(12): 2331-2336.

Figures/Tables 5

Fig. 1. (a) XRD patterns of the ZnFe2O4 photocatalyst, red line: 180 °C, black line: 150 °C, blue line: PDF Card 22-1436. (b) BET curve of the ZnFe2O4 photocatalyst.

Fig. 2. (a) TEM (Note: Insert images show the SAED patterns), (b) HRTEM and (c) EDX elemental mapping images of the ZnFe2O4 photocatalyst.

Fig. 3. (a) XPS survey spectrum of the ZnFe2O4 photocatalyst. (b) The high resolution XPS scans over Zn 2p peaks. (c) The high resolution XPS scans over Fe 2p peaks. (c) The high resolution XPS scans over O 1s peaks.

Fig. 4. (a) UV-vis light absorbance spectra, (b) band gap, (c) XPS valence band spectra, (d) energy band structures of the ZnFe2O4 photocatalyst.

Fig. 5. (a) The irradiation time-dependent generation of CH3CH2OH and CH3CHO for ZnFe2O4 photocatalyst in the photoreduction of CO2 under visible light illumination. (b) The proposed mechanism of the photocatalytic activity of ZnFe2O4 photocatalyst under visible light illumination.

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Fabrication ofultrafine ZnFe₂O₄ nanoparticles for efficient photocatalytic reduction CO₂ under visible light illumination

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