Separable magnetic MoS 2 @Fe 3 O 4 nanocomposites with multi-exposed active edge facets toward enhanced adsorption and c
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Separable magnetic MoS2@Fe3O4 nanocomposites with multi-exposed active edge facets toward enhanced adsorption and catalytic activities Zhijuan Zhang1, Rui Shi1, Fuyu Wang2,*, Shuang Wang1, Guoyuan Fu1, Xinyu Zou1, Lei Li1, Li Yu1, Yurun Tian1, and Fang Luo1,* 1
Key Laboratory of Polyoxometalate Science of the Ministry of Education, College of Chemistry, Northeast Normal University, Jilin 130024, People’s Republic of China 2 College of Transportation, Jilin University, Changchun 130022, People’s Republic of China
Received: 3 August 2020
ABSTRACT
Accepted: 17 November 2020
We synthesized fluffy MoS2 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 MoS2 nanosheets was 0.90 with a 4:5 (CH3CSNH2: Na2MoO42H2O) mass ratio (M4-5). To the best of our knowledge, this value should be high, implying that the obtained MoS2 nanosheets exposed considerable (100) facets. Because the noncentrosymmetric Mo-2S on edges terminated by dangling bonds exhibits rich defects, high active MoS2 edge planes (100) prevail over inert MoS2 basal planes (002). To overcome its easy suspension and difficult recovery, the magnetic Fe3O4 was selected for in situ doping with ultrathin M4-5, and a unique structure of stable MoS2@Fe3O4 (M@F) nanocomposites-like randomly stacked rose petals-wrapped spherical chocolate beans was obtained for the first time. The introduction of Fe3O4 has to sacrifice some edge active sites, but after balancing the magnetic and active sites, (100)/(002) of MoS2 in M@F can also reach 0.56, showing that edges of MoS2 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.
Published online: 24 November 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Christopher Blanford.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05588-1
5016
J Mater Sci (2021) 56:5015–5030
GRAPHICAL ABSTRACT
Introduction In recent years, the synthesis and application of transition metal dichalcogenides (TMDs) have attracted great attention because of their unique structure and incredible properties [1, 2]. TMDs are a class of materials with the formula MX2, where M is the transition metal (Mo or W) and X is the chalcogen (S or Se). Among them, molybdenum disulfide (MoS2) is a representative member [3, 4]. Stable and dominant 2H-MoS2 in nature is a typical two-dimensional layered material, in which Mo atoms are sandwiched between two layers of hexagonal closely packed sulfur atoms (S-Mo-S), forming a three-layer stack similar to a sandwich struct
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