Visible Light-Driven Mn-MoS₂/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B

Abstract

The n%Mn-MoS2/rGO (labeled as n%MMS/rGO, where n% = Mn/(Mn + Mo) in mol) composites were successfully prepared by a facile hydrothermal method from the Mn-MoS2 (MMS) and rGO precursors, in which the MMS was obtained by a facile one-step calcination of (NH4)6Mo7O24·4H2O, (NH2)2CS, and Mn(CH3COO)2·4H2O as precursors in N2 gas at 650°C. The samples were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron paramagnetic resonance spectroscopy (EPR), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), and X-ray photoelectron spectroscopy (XPS), which indicates the composites containing nanosheets of Mn-MoS2 and rGO components. The photocatalytic activities of the n%MMS/rGO composite photocatalysts were evaluated through the photodegradation of rhodamine B (RhB) under the visible light irradiation. The enhancement in the photocatalytic performance of the achieved composites was attributed to the synergic effect of Mn doping and rGO matrix. The investigation of photocatalytic mechanism was also conducted.

Cost-Effective and Highly Efficient Manganese-Doped MoS2 Nanosheets as Visible-Light-Driven Photocatalysts for Wastewater Treatment

“…This indicates that the Mn dopants form strong chemical bonds with the oxygen atoms in the MoS 2 lattice. The results also suggest that the doping of Mn into the MoS 2 lattice increases the electronic conductivity of the material. , …”

“…The results also suggest that the doping of Mn into the MoS 2 lattice increases the electronic conductivity of the material. 45,46 A schematic of the experimental configuration of photocatalysis is depicted in Figure 7a. To study the photocatalytic activity of the Mn-doped MoS 2 nanostructure as a catalyst, the coated sample was submerged in methylene blue for an hour and then kept in the dark.…”

Graphene-based hydrogel silver nano-composites for antibacterial and antitumor applications: In vitro evaluation

“…There are many methods for the reduction of GO, such as the thermal, optical, and chemical ones. Among these methods, the chemical one is the most popular and depends on many types of reducing agents [25]. We performed an oxidation process using the hummers ̍ method to produce GO, followed by a green reduction method using ascorbic acid (vitamin C) to obtain reduced graphene oxide (rGO) [26].…”