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. 2018 Oct 30;8(64):36625-36631.
doi: 10.1039/c8ra06537c. eCollection 2018 Oct 26.

Construction of flower-like MoS2/Fe3O4/rGO composite with enhanced photo-Fenton like catalyst performance

Dongzhao Mu  1 , Zhe Chen  1 , Hongfei Shi  1 , Naidi Tan  1
Affiliations

Construction of flower-like MoS2/Fe3O4/rGO composite with enhanced photo-Fenton like catalyst performance

Dongzhao Mu et al. RSC Adv. .

Abstract

High-performance and recyclable photocatalysts have attracted considerable amounts of attention for use in wastewater treatment. In this paper, a MoS2/Fe3O4/rGO (0.1 wt%) composite was synthesized by an environmentally-friendly and facile strategy, and showed high potential for recyclability. The nanocomposite exhibited high photocatalytic activity in the presence of H2O2 and rGO (reduced graphene oxide) under visible-light irradiation. Notably, when 3 mg of MoS2/Fe3O4/rGO (0.1 wt%) was added to rhodamine B (RhB, 30 mg L-1) solution, the degradation rate was almost 100% within 40 min at neutral pH under visible-light irradiation. This rate was four times more rapid than that of MoS2 and double that of MoS2/Fe3O4. The results indicate that rGO plays an important role in photocatalysis by suppressing the recombination of photogenerated electron-hole pairs and enhancing the absorption capability of visible-light and organic dyes. Finally, the photocatalytic and stability mechanisms of MoS2/Fe3O4/rGO (0.1 wt%) are proposed. This work further helps our understanding of the photo-Fenton mechanism. Furthermore, the synthesis of this composite has potential for application in energy storage devices.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. XRD patterns of MoS2, Fe3O4 and MoS2/Fe3O4/rGO (0.1 wt%).
Fig. 2
Fig. 2. XPS spectra of MoS2/Fe3O4/rGO (1 wt%): (a) the full survey; (b) C 1s (c) Fe 2p (d) O 1s (e) Mo 3d; (f) S 2p.
Fig. 3
Fig. 3. SEM images (a and b), and TEM images low and high magnifications (c and d) of MoS2/Fe3O4/rGO (0.1 wt%).
Fig. 4
Fig. 4. FTIR spectra of MoS2, MoS2/Fe3O4 and MoS2/Fe3O4/rGO (0.1 wt%).
Fig. 5
Fig. 5. N2 adsorption–desorption isotherms and pore-size distribution curves of the obtained samples.
Fig. 6
Fig. 6. Hysteresis curves of MoS2/Fe3O4/rGO (0.1 wt%) composites.
Fig. 7
Fig. 7. UV-spectra of absorption of degradation (a) MoS2/Fe3O4/rGO (0.1 wt%) and degradation curves of different samples (the amount of H2O2: 100 μL) (b). Error bars representing standard deviation are calculated at 95% confidence level.
Fig. 8
Fig. 8. Photocatalytic degradation of RhB by the as-prepared MoS2/Fe3O4/rGO (0.1 wt%) samples with different value of pH (the amount of H2O2: 100 μL) (a) and different volume of H2O2 (b). Error bars representing standard deviation are calculated at 95% confidence level.
Fig. 9
Fig. 9. Recycle experiments of (a) photodegradation of RhB with MoS2/Fe3O4/rGO (0.1 wt%), the effects of various scavengers on photocatalytic activity of photocatalyst (b) and photo-Fenton degradation of RhB in different condition (c). Error bars representing standard deviation are calculated at 95% confidence level.
Fig. 10
Fig. 10. Schematic illustration of the proposed formation mechanism of as-prepared samples.
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