Citation: Wu Jiajia, Ji Zhenyuan, Shen Xiaoping, Miao Xuli, Xu Keqiang. Synthesis of γ-Fe₂O₃ Nanocubes Decorated Graphene/CdS Nanocomposites with Enhanced Photocatalytic Performance[J]. Acta Chimica Sinica, ;2017, 75(12): 1207-1214. doi: 10.6023/A17050220 shu

Synthesis of γ-Fe₂O₃ Nanocubes Decorated Graphene/CdS Nanocomposites with Enhanced Photocatalytic Performance

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013 China

Corresponding author: Shen Xiaoping, xiaopingshen@163.com
Received Date: 21 May 2017
Available Online: 10 December 2017
Fund Project: the Natural Science Foundation of Jiangsu Province BK20150507the National Natural Science Foundation of China 51602129the National Natural Science Foundation of China 51272094the Natural Science Foundation of Jiangsu Province BK20171295Project supported by the National Natural Science Foundation of China (Nos. 51272094, 51602129) and the Natural Science Foundation of Jiangsu Province (Nos. BK20171295, BK20150507)

Figures(10)

With Prussian blue (PB) as the precursor for γ-Fe₂O₃, the tri-component CdS/RGO/γ-Fe₂O₃ photocatalyst was prepared through loading PB nanocubes and CdS nanoparticles on graphene oxide (GO) nanosheets, followed by a calcination process in inert atmosphere (N₂). The content of γ-Fe₂O₃ in the CdS/RGO/γ-Fe₂O₃ photocatalyst can be adjusted by changing the loading amount of PB, and the cubic morphology of PB was maintained after the calcination. The composition, structure, morphology and light absorption of the as-prepared products were investigated by X-ray diffraction (XRD), X-ray energy dispersive spectroscopy (EDS), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (FT-IR), Raman spectroscopy and ultraviolet-visible (UV-vis) spectroscopy. The photocatalytic activity of the ternary photocatalysts was evaluated by the degradation of the organic pollutant of Rhodamine B (RhB) under visible-light irradiation. It was found that the degradation process of RhB follows pseudo-first-order kinetics. Compared to the bi-component CdS/RGO photocatalyst, the tri-component CdS/RGO/γ-Fe₂O₃ exhibited greatly enhanced photocatalytic activity, demonstrating that the γ-Fe₂O₃ played an important role in the photocatalytic process. The CdS/RGO/γ-Fe₂O₃ composite with PB loading amount of 12 mg exhibits the highest photocatalytic degradation efficiency of about 99.8% and the highest apparent reaction rate constant (k) value of about 0.03289 min^-1, which is almost 2.9 times and 1.8 times higher than that of CdS and CdS/RGO, respectively. This result indicates that a suitable loading amount of γ-Fe₂O₃ is important to optimize the photocatalytic performance of the CdS/RGO/γ-Fe₂O₃ composites. Moreover, owing to the ferromagnetism of γ-Fe₂O₃, the CdS/RGO/γ-Fe₂O₃ photocatalyst could be easily separated from the reaction solution for recycling by a magnet. A possible photocatalytic mechanism was also proposed based on the photoluminescence (PL) characterization and the active species capture experiment. It was demonstrated that the enhanced photocatalytic degradation properties of CdS/RGO/γ-Fe₂O₃ composites can be ascribed to the excellent conductivity of RGO and the construction of Z-scheme heterostructure between CdS and γ-Fe₂O₃, which facilitate the transport and separation of photogenerated carriers.
- γ-Fe₂O₃,
- graphene,
- CdS,
- photocatalysis,
- mechanism
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Synthesis of γ-Fe₂O₃ Nanocubes Decorated Graphene/CdS Nanocomposites with Enhanced Photocatalytic Performance