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. 2019 Aug 5;9(42):24280-24290.
doi: 10.1039/c9ra03858b. eCollection 2019 Aug 2.

Facile synthesis of few-layer MoS2 in MgAl-LDH layers for enhanced visible-light photocatalytic activity

Guoyuan Zheng  1   2 , Caihong Wu  1   2 , Jilin Wang  1   2 , Shuyi Mo  1   2 , Yanwu Wang  3 , Zhengguang Zou  1   2 , Bing Zhou  1   2 , Fei Long  1   2
Affiliations

Facile synthesis of few-layer MoS2 in MgAl-LDH layers for enhanced visible-light photocatalytic activity

Guoyuan Zheng et al. RSC Adv. .

Abstract

A new photocatalyst, few-layer MoS2 grown in MgAl-LDH interlayers (MoS2/MgAl-LDH), was prepared by a facile two-step hydrothermal synthesis. The structural and photocatalytic properties of the obtained material were characterized by several techniques including powder X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL) and UV-vis absorption spectroscopy. The MoS2/MgAl-LDH composite showed excellent photocatalytic performance for methyl orange (MO) degradation at low concentrations (50 mg L-1 and 100 mg L-1). Furthermore, even for a MO solution concentration as high as 200 mg L-1, this composite also presented high degradation efficiency (>84%) and mineralization efficiency (>73%) at 120 min. The results show that the MoS2/MgAl-LDH composite has great potential for application in wastewater treatment.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Scheme 1
Scheme 1. Design of the MoS2/MgAl-LDH growth process.
Fig. 1
Fig. 1. XRD patterns of MgAl-LDH, MoO42−/MgAl-LDH, MoS2 and MoS2/MgAl-LDH (a), and Raman spectra of MoS2 and MoS2/MgAl-LDH (b).
Scheme 2
Scheme 2. Schematic of the spacing change of the (003) plane.
Fig. 2
Fig. 2. FTIR spectra (a) of MgAl-LDH, MoS2/MgAl-LDH and MoS2 in the range of 400–4000 cm−1; and (b) of MoS2/MgAl-LDH and MoS2 in the range of 400–1200 cm−1.
Fig. 3
Fig. 3. FESEM images of MoS2 (a), MgAl-LDH (b), MoO42−/MgAl-LDH (c), and MoS2/MgAl-LDH (d). TEM images of MoS2 (e), MgAl-LDH (f), and MoS2/MgAl-LDH (g) and HRTEM image of MgAl-LDH (h).
Fig. 4
Fig. 4. XPS spectra of the MoS2/MgAl-LDH sample (a) and high-resolution XPS spectra of Mo 3d (b), S 2p (c), and C 1s (d).
Fig. 5
Fig. 5. Effect of initial solution pH values on the photodegradation (a) and mineralization (b) of MO (conditions: initial MO concentration 200 mg L−1, photocatalyst dosage 1 g L−1). Inset: UV-vis spectra of catalyzed solutions. Effect of initial MO concentration on the photodegradation (c) and mineralization (d) of MO (conditions: initial solution pH = 3, adsorbent dosage 1 g L−1). Inset: the UV-vis spectra of catalyzed solutions (top) and optical photographs of supernatants obtained by centrifugation (bottom). Photocatalytic degradation curves (e) and mineralization efficiency (f) of the samples. Inset: the UV-vis spectra of catalyzed solutions. The kinetic analysis of the samples (g). Cycles of photocatalytic degradation of MO using MoS2/MgAl-LDH (h) and FTIR spectra of MoS2/MgAl-LDH before and after photocatalysis (i).
Fig. 6
Fig. 6. N2 adsorption–desorption isotherm curves (a) and pore size distribution curves (b) of the samples. UV-vis spectra of MgAl-LDH, MoS2 and MoS2/MgAl-LDH (c) and the bandgap curves of MoS2 (d) and MoS2/MgAl-LDH (e). Fluorescence spectra of MgAl-LDH, MoS2 and MoS2/MgAl-LDH (f).
Fig. 7
Fig. 7. Electrical characteristics of MgAl-LDH (a), MoS2 (b), and MoS2/MgAl-LDH (c). Semiconductor characteristic curves of MoS2 (d), and MoS2/MgAl-LDH (e).
Fig. 8
Fig. 8. Photocatalysis tests with different quenchers over MoS2/MgAl-LDH.
Scheme 3
Scheme 3. Photocatalytic mechanism schematic of MO degradation by MoS2/MgAl-LDH.
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References

    1. Iqbal K. Iqbal A. Kirillov A. M. Wang B. Liu W. Tang Y. J. Mater. Chem. A. 2017;5:6716–6724. doi: 10.1039/C6TA10880F. - DOI
    1. Valentea J. S. Tzompantzib F. Princec J. Appl. Catal., B. 2011;102:276–285. doi: 10.1016/j.apcatb.2010.12.009. - DOI
    1. Liu X. Zhao X. Zhu Y. Zhang F. Appl. Catal., B. 2013;140:241–248. doi: 10.1016/j.apcatb.2013.04.008. - DOI
    1. Gupta V. K. Saleh T. A. Environ. Sci. Pollut. Res. Int. 2013;20:2828–2843. doi: 10.1007/s11356-013-1524-1. - DOI - PubMed
    1. Legrini O. Oliveros E. Braun A. M. Chem. Rev. 1993;93:671–698. doi: 10.1021/cr00018a003. - DOI