Abstract
New molybdenum disulfide (MoS2)-based core–shell nanocomposite materials were successfully prepared through the self-assembly of mussel-inspired chemistry. Characterization by Fourier transform infrared, thermogravimetric analysis, scanning electron microscope and transmission electron microscopy revealed that the surface of the flaked MoS2 was homogeneously coated with a thin layer of polydopamine (PDA). Dye adsorption performances of the synthesized MoS2–PDA nanocomposites were investigated at different pH values and reaction times. Compared with pure MoS2 nanosheets, the obtained core–shell nanocomposites showed elevated adsorption performances and high stability, indicating their potential applications in wastewater treatment and composite materials.
Highlights
300 mg of MoS2 nanosheets were rst dispersed in 100 mL of Tris buffer (10 mM, pH 1⁄4 8.5) with sonication for 10 minutes, and 200 mg of dopamine was added to the above solution with stirring
MoS2–PDA nanocomposites were obtained by modi cation of MoS2 nanosheets with a PDA layer in Tris buffer solution and dried by centrifugation
In the transmission electron microscope (TEM) image, it was obvious that the outer edge of the MoS2 nanosheets demonstrated some ultra-thin layer structures, which indicated that the PDA layer had been successfully anchored on the surface of the MoS2 nanosheets
Summary
Over the past several decades, graphene has been attracting a great deal of attention due to the unusual properties associated with its ultrathin structure.[1,2,3,4,5,6,7] Among other twodimensional layer materials,[8,9,10,11] molybdenum disul de (MoS2) is one of the most attractive and has a similar structure to graphite.[12,13,14,15,16] MoS2 has a sandwich structure consisting of two layers of sulfur atoms and a middle layer of molybdenum atoms, which are bonded by van der Waals forces.[17,18,19,20] MoS2 nanosheets have many excellent physical and chemical properties, and demonstrate important applications in sensors,[21,22,23,24] optoelectronic devices,[25,26] catalysis[27,28] and other elds.[29] In addition, MoS2 nanocomposites have attracted wide study in the eld of polymer nanocomposites.[30,31,32,33] For example, Li et al investigated polyethylene glycol (PEG)-modi ed MoS2 surfaces,[34] and the obtained products showed good removal efficiency toward some dyes
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