Separable Magnetic Fe3O4@MoS2 Composite for Adsorption and Piezo-Catalytic Degradation of Dye

Abstract

Well-designed composite catalysts are of increasing concern due to their improved performance compared to individual components. Herein, we designed and synthesized an Fe3O4@MoS2 composite via a simple hydrothermal method. As for the resultant composite, the MoS2 nanolayers presented a novel piezo-catalytic effect, while the Fe3O4 core provided a magnetic separation property. The structure and properties of Fe3O4@MoS2 were determined by relevant experiments. It was found that Fe3O4@MoS2 exhibited enhanced piezo-catalytic degradation of rhodamine B and good magnetic recovery/recycling features. The kobs for rhodamine B degradation over Fe3O4@MoS2 was 0.019 min−1—a little longer than that over MoS2 (0.013 min−1). Moreover, Fe3O4@MoS2 also showed a favorable ability to adsorb rhodamine B in solution, with a saturation adsorption of 26.8 mg/g. Further studies revealed that piezo-electrons, holes, and superoxide anions were key species in the piezo-catalytic degradation of rhodamine B. Notably, the step where oxygen trapped electrons to produce superoxide anions had a significant impact on the degradation of the dye. This work, not limited to the development of a high-performance MoS2-based piezo-catalyst, is expected to provide new insights into the working mechanisms and process profiles of composite piezo-catalysts.

Dual Resonance Behavior and Enhanced Microwave Absorption Performance of Fe3O4@C@MoS2 Composites with Shape Magnetic Anisotropy

“…The average diameter of Fe 3 O 4 @C hexagonal nanoplates is reduced to about 252 nm and the average thickness is 16 nm (Figure S3), which corresponds to an aspect ratio of 6.15. The reduction of the average size may be attributed to the phase transition from α-Fe 2 O 3 to Fe 3 O 4 during the high-temperature reduction and annealing process Figure S2d presents the SEM images of the Fe 3 O 4 @C@MoS 2 composites.…”

Multifunctional Nanoprobe-Amplified Enzyme-Linked Immunosorbent Assay on Capillary: A Universal Platform for Simple, Rapid, and Ultrasensitive Dual-Mode Pathogen Detection

“…The Fe 3 O 4 , MoS 2 , and Fe 3 O 4 @MoS 2 nanoprobes were prepared according to the previously reported method with slight modification. − To prepare the immune capillary, the capillary tube was partially immersed in piranha solution and modified with amino groups on the inner surface. Both the nanoprobe and immune capillary were further modified with the antibody for specific recognition.…”