Modification of Nano-sized Fe2O3 Photocatalysts with N-doped Graphene and g-C3N4 †

doi:10.7503/cjcu20160524

Abstract

Abstract:

Alpha iron-trioxide(α-Fe₂O₃) nanoparticles were synthesized by a phase-separated hydrolysis-solvothermal method, and then modified by coupling 3%(mass fraction) graphene, nitrogen-doped graphene and g-C₃N₄ as the two-dimensional hetero-materials by a simple wet chemical process. Detailed comparative studies of their effects on photocatalytic activities of α-Fe₂O₃ were carried out. The results show that the photocatalytic activities of nano α-Fe₂O₃ for reducing CO₂ to CO and for degrading phenol are enhanced after coupling with all two-dimensional hetero-materials. The modification of nitrogen-doped graphene on α-Fe₂O₃ is better than graphene and the modification of g-C₃N₄ on α-Fe₂O₃ is the best. Based on the measurements of surface photovoltage responses, photoelectrochemical curves, and hydroxyl radical amounts, it is confirmed that the introduction of two-dimensional hetero-materials would promote the photogenerated charge separation and increase the content of the active intermediate(hydroxyl radicals) consequently, leading to the improved photocatalytic activity of nano α-Fe₂O₃.

Key words: α-Fe₂O₃, Two-dimensional hetero-material modification, Photogenerated charge separation, CO₂ reduction, Pollutant degradation

CLC Number:

O643.3

TrendMD:

WANG Jinshuang, QIN Chuanli, WANG Hongjian, LI Jiadong, ZHANG Xuliang, CHEN Shuangying, JING Liqiang. Modification of Nano-sized Fe₂O₃ Photocatalysts with N-doped Graphene and g-C₃N₄ ^†[J]. Chem. J. Chinese Universities, 2017, 38(2): 246.

Figures/Tables 5

Fig.1 XRD patterns(A), Raman spectra(B) of different nanocomposites and N1s XPS spectrum of CN-F(C) (A) a. F; b. G-F; c. NG-F; d. CN-F. (B) a. G-F; b. NG-F.

Fig.2 UV-Vis DRS spectra(A) and SPS response intensities in different atmospheres(B) of different samples The inset shows the SPS responses of the samples in air. a. CN-F; b. NG-F; c. G-F; d. F.

Fig.3 Photocatalytic activities of different samples for reduction of CO2 to CO( ) and for phenol degradation()

Fig.4 Fluorescence spectra related to the produced hydroxyl radical amount a. F; b. G-F; c. NG-F; d. CN-F.

Fig.5 I-V curves of different samples a. F; b. G-F; c. NG-F; d. CN-F.

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Modification of Nano-sized Fe₂O₃ Photocatalysts with N-doped Graphene and g-C₃N₄ ^†

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