Abstract
Herein, we introduce a stepwise method to construct multi-element PANI@MoS2@Fe3O4/Ag, Au, Pd composites as catalysts, which exhibit excellent performance in the reduction of 4-nitrophenol as well as enzyme-like catalysis.
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•The PANI@MoS2 microtubes was synthesized through a self-sacrifice template method.•Fe3O4 and noble metal nanoparticles were covered on the PANI@MoS2 microtubes.•PANI@MoS2@Fe3O4/Pd exhibited excellent performance in catalytic application.
Heterostructures exhibit excellent performance in catalytic application owing to the synergistic effect of multi-components and unique interface structure. Herein, we develop a facile method to construct multi-element PANI@MoS2@Fe3O4/Ag, Au, Pd composites as catalysts, where polyaniline(PANI) microtubes acts as intimal “core”, wrinkled ultrathin MoS2 nanosheets as the outer “shell”, tiny Fe3O4, Ag, Au, Pd nanoparticles(NPs) as the seeds decorated on the outer MoS2 shell. Benefiting from the synergistic effects among PANI@MoS2, Fe3O4, the noble metal component as well as the unique structure, PANI@MoS2@Fe3O4/Ag, Au, Pd composites show excellent activity in reducing 4-nitrophenol in the presence of NaBH4 and catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with the participation of H2O2. Furthermore, the PANI@MoS2@Fe3O4/Ag, Au, Pd composites can be easily recycled with the help of magnet. Remarkably, the introduction of MoS2 on PANI microtubes enhance the electron transfer, reduce the impedance and thus improve the dispersion of the Fe3O4 and noble metals NPs. Our work offers an advanced surface engineering solution to construct a peroxidase-like and 4-nitrophenol catalyst, with bright future in environmental science and biological technology.