Separable magnetic MoS2@Fe3O4 nanocomposites with multi-exposed active edge facets toward enhanced adsorption and catalytic activities

We synthesized fluffy MoS 2 material stacked by ultrathin nanosheets through adjusting different mass ratios of starting materials via a facile hydrothermal method. Surprisingly, XRD characterization results demonstrated that the intensity ratio of (100) to (002) of ultrathin MoS 2 nanosheets was 0....

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Bibliographic Details
Published in:Journal of materials science 2021-03, Vol.56 (8), p.5015-5030
Main Authors: Zhang, Zhijuan, Shi, Rui, Wang, Fuyu, Wang, Shuang, Fu, Guoyuan, Zou, Xinyu, Li, Lei, Yu, Li, Tian, Yurun, Luo, Fang
Format: Article
Language:English
Subjects:
Adsorption
Beans
Characterization and Evaluation of Materials
Chemical reduction
Chemical Routes to Materials
Chemical synthesis
Chemistry and Materials Science
Chocolate
Classical Mechanics
Crystallography and Scattering Methods
Exposure
Iron oxides
Mass ratios
Materials Science
Molybdenum disulfide
Nanocomposites
Nanostructure
Nitrophenol
Polymer Sciences
Sodium molybdate
Solid Mechanics
Wastewater treatment
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Summary:We synthesized fluffy MoS 2 material stacked by ultrathin nanosheets through adjusting different mass ratios of starting materials via a facile hydrothermal method. Surprisingly, XRD characterization results demonstrated that the intensity ratio of (100) to (002) of ultrathin MoS 2 nanosheets was 0.90 with a 4:5 (CH 3 CSNH 2 : Na 2 MoO 4 ·2H 2 O) mass ratio (M4-5). To the best of our knowledge, this value should be high, implying that the obtained MoS 2 nanosheets exposed considerable (100) facets. Because the noncentrosymmetric Mo-2S on edges terminated by dangling bonds exhibits rich defects, high active MoS 2 edge planes (100) prevail over inert MoS 2 basal planes (002). To overcome its easy suspension and difficult recovery, the magnetic Fe 3 O 4 was selected for in situ doping with ultrathin M4-5, and a unique structure of stable MoS 2 @Fe 3 O 4 (M@F) nanocomposites-like randomly stacked rose petals-wrapped spherical chocolate beans was obtained for the first time. The introduction of Fe 3 O 4 has to sacrifice some edge active sites, but after balancing the magnetic and active sites, (100)/(002) of MoS 2 in M@F can also reach 0.56, showing that edges of MoS 2 nanosheets are still multi-exposed. Abundant exposed edges of M@F provide numerous active centers, so M@F nanocomposites exhibited excellent performance for both the 4-nitrophenol (4-NP) reduction and dye adsorption. Therefore, it has great application prospects in wastewater treatment and reduction reaction and is also worth exploring in other applications. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-05588-1