Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> Core–Shell Composites:
Preparation, Characterization, and Catalytic Application
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Abstract
Molybdenum
disulfide (MoS<sub>2</sub>) has received tremendous attention due
to the earth-abundant composition and high catalytic activity. However,
the catalytic activity of MoS<sub>2</sub> except electro- and photocatalytic
has seldom been explored. Herein, Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> core–shell composites were prepared for the first
time by <i>in situ</i> growth of MoS<sub>2</sub> nanosheets
on the surfaces of Fe<sub>3</sub>O<sub>4</sub> nanoparticles under
different temperature, and the catalytic performance of the resulting
composites was evaluated by using the catalytic reduction of 4-nitrophenol
to 4-aminophenol. FE-SEM, TEM, XRD, and XPS analyses verified the
core–shell structure with MoS<sub>2</sub> nanosheets of defect-rich
and oxygen incorporation on the surfaces of Fe<sub>3</sub>O<sub>4</sub> nanoparticles. Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> composites
were found to exhibit a high catalytic activity for the reduction
of 4-nitrophenol with the highest activity factor <i>k</i> = 3773 min<sup>–1</sup> g<sup>–1</sup>. A plausible
catalytic mechanism for the reduction of 4-nitrophenol was also proposed.
This study presents an inexpensive, reusable, fast, and highly efficient
catalyst for the reduction of 4-nitrophenol without noble metals