Effects of Phosphate Modification on the Thermal Stability and Photocatalytic Activity of Nanosized Fe2O3†

doi:10.7503/cjcu20131257

Abstract

Abstract:

α-Fe₂O₃ nanoparticles were modified with phosphate acid by the dipping-steam solution process. The influence of phosphate modification on the thermal stability of nanosized Fe₂O₃ was investigated. The results showed that the thermal stability of Fe₂O₃ was remarkably enhanced by phosphate modification, owing to the inhibition of aggregation between nanoparticles by the modified phosphate groups. The sample treated at 600 ℃ showed the highest photocatalytic activity for degrading gas-phase acetaldehyde and liquid-phase phenol. This was ascribed to the high crystallinity, small nanoparticle size and large specific surface area of the sample. Moreover, it was favorable to improve the photogenerated charge separation after modification with a proper amount of phosphoric acid.

Key words: Fe2O3, Thermal stability, Photogenerated charge separation, Photocatalysis, Colorless pollutant degradation

CLC Number:

O643.3

TrendMD:

MENG Qingqiang, SUN Wanting, LUAN Yunbo, JING Liqiang. Effects of Phosphate Modification on the Thermal Stability and Photocatalytic Activity of Nanosized Fe₂ $O 3 †$ [J]. Chem. J. Chinese Universities, 2014, 35(8): 1782.

Figures/Tables 8

Fig.1 XRD patterns of different samples a. F-400; b. 1.0P-F-400; c. F-600; d. 1.0P-F-600; e. F-800; f. 1.0P-F-800.

Fig.2 TEM images of samples F-400(A), F-600(B) and 1.0P-F-600(C)

Fig.3 P2p XPS spectra of different samples

Fig.4 DRS spectra of different samples Inset is of samples unmodified by phosphate.

Fig.5 Hydroxyl radical amount-related fluorescence spectra(A, B) and SPS responses(C, D) of different samples

Fig.6 Photocatalytic degradation rates of different Fe2O3 samples(A,B) and different P-Fe2O3 samples(C, D) on acetaldehyde(A, C) and phenol(B, D) (B) After reaction for 2 h; (D) after reaction for 1.5 h.

Fig.7 XRD patterns(A), IR spectra(B), SPS responses(C) and hydroxyl radical amount-related fluorescence spectra(D) of different P-Fe2O3 samples

Fig.8 Photocatalytic degradation rates of different P-Fe2O3 samples on acetaldehyde(A) and phenol(B)

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Effects of Phosphate Modification on the Thermal Stability and Photocatalytic Activity of Nanosized Fe₂ $O 3 †$

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