Synergetic effect of MoS₂–RGO doping to enhance the photocatalytic performance of ZnO nanoparticles

Abstract

In this work, we report on the synergetic role played by MoS2–RGO doping in enhancing the photocatalytic activity of ZnO nanoparticles, especially in utilizing both the UV and the visible light regions of the solar spectrum.

Facile and Cost‐Efficient Synthesis of Quasi‐0D/2D ZnO/MoS2 Nanocomposites for Highly Enhanced Visible‐Light‐Driven Photocatalytic Degradation of Organic Pollutants and Antibiotics

“…It also indicates the dominant role played by 2D MoS 2 framework in the degradation pathway. Furthermore, undue ZnO NP loading could increase the sample opacity and excessive decoration may facilitate agglomeration of ZnO nanocrystallites, resulting in adverse light scattering effect and prolonged carrier diffusion length . These factors might also weaken the prime photocatalytic enhancement resulted from heterojunction.…”

Role of RGO support and irradiation source on the photocatalytic activity of CdS–ZnO semiconductor nanostructures

“…As described in literature [34], 1.0 g of graphite powder and 0.5 g of NaNO 3 was stirred in 23 mL of concentrated H 2 SO 4 in an ice bath to maintain a reaction temperature below 10 °C. This was followed by the slow addition of 3.0 g of KMnO 4 to the reaction mixture with continuous stirring.…”

“…Several semiconductor nanocomposites supported on graphene have been used as photocatalysts for the degradation of organic pollutants [32–35]. In one of our recent works [34], we have reported the synergistic effect of MoS 2 –RGO support to improve the photocatalytic performance of ZnO nanoparticles. However, the role played by RGO support in enhancing the photocatalytic performance of the nanocomposites has not been fully explored.…”

N-doped ZnO–MoS2 binary heterojunctions: the dual role of 2D MoS2 in the enhancement of photostability and photocatalytic activity under visible light irradiation for tetracycline degradation

“…For pure ZnO NR, Raman bands around 436 cm -1 , 382 cm -1 and 331 cm -1 can be assigned to E 2 (high), A 1 (TO) (transverse optical) and A 1 vibration modes, which are the characteristic bands for hexagonal wurtzite ZnO. 43 N-ZnO material also displayed the E 2 (high), A 1 (TO) (transverse optical) and A 1 vibration modes revealing that the wurtzite structure of ZnO was preserved during nitrogen implantation. It is well reported in the literature, 51 that ion implantation introduces the disorder activated Raman scattering (DARS), which is responsible for the emergence of silent B 1 (low) mode at 273 cm -1 and B 1 (high) mode at 580 cm -1 in doped ZnO and cm -1 and 381 cm -1 can be assigned to E 1 g and E 1 2g corresponds to the associated vibrations of two S atoms with respect to Mo atom, and peak around 407 cm -1 can be ascribed to A 1 g vibration mode and corresponds to out-of-plane vibration of S atoms.…”

“…However, fast recombination of photogenerated charge carriers and poor conductivity of MoS 2 limits its application as cocatalyst 42. In one of our previous works, we have investigated the photocatalytic performance of ZnO nanoparticles,43 thus in the view of further improvement herein we report the N-doped Furthermore, 1D nanostructures such as ZnO NR exhibit superior photocatalytic activity as compared to the spherical nanoparticles due to dimensional anisotropy and higher aspect ratio which lead to large number of electron-hole pairs on its surface which can flow in the direction of crystal length and significantly decreases the charge recombination. 44 N-doped ZnO NR offers large surface area and intimate contact with 2D MNF to form heterojunction with enhanced absorption in the visible range.…”