Layer-controlled growth of MoS2 on self-assembled flower-like Bi2S3 for enhanced photocatalysis under visible light irradiation

Abstract

Metal sulfide semiconductors, such as molybdenum disulfide (MoS 2 ) and bismuth trisulphide (Bi 2 S 3 ), are of considerable interest for their excellent applications in photocatalysis and in many other fields. However, the controllable synthesis of MoS 2 /Bi 2 S 3 hybrid nanostructures remains a challenge. In this study, we report a unique sacrificial templating strategy for preparing layer-controlled MoS 2 on three-dimensional (3D) Bi 2 S 3 micro-flowers. For this approach, Bi 2 S 3 was utilized as a sacrificial template to regulate the ion exchange, and the dosage of molybdenum was adjusted to tune the dynamic formation, thus converting the MoS 2 nanosheets on the Bi 2 S 3 micro-flowers from monolayer to multilayer. Such a 3D flower-like hybrid nanostructure enables MoS 2 /Bi 2 S 3 to exhibit adsorption-promoted photocatalysis under visible light irradiation, especially for the excellent photodegradation of low-concentration organic pollutants, for example, azo dye and atrazine. The observed superiority of the 3D MoS 2 /Bi 2 S 3 was mainly attributed to the increased mass transfer, robust light-harvesting capacity, improved charge separation, lower oxygen-activation barrier and enhanced active oxygen yield. Our findings are of interest for the development of novel S-based photocatalysts and provide a new opportunity to efficiently remove low-concentration refractory pollutants.

Significant Enhancement of Hydrogen Production in MoS2/Cu2ZnSnS4 Nanoparticles

“…The nanostructured MoS 2 tightly attached on the surface of Cu 2 ZnSnS 4 NPs is expected to act as an efficient electron transfer medium, making charge separation suppress the electron–hole recombination, as well as enhancing the photocatalytic performance. Furthermore, previous report shows the lattices of MoS 2 and Cu 2 ZnSnS 4 match well, which is another advantage for charge carrier transfer between the nanostructured MoS 2 and the host of Cu 2 ZnSnS 4 NPs.…”

2D/2D Heterojunction of R-scheme Ti3C2 MXene/MoS2 Nanosheets for Enhanced Photocatalytic Performance

“…Metal sulfide semiconductor catalysts have been considered as essential carriers to solve environmental pollution and energy crisis due to the narrow bandgaps, low toxicity and excellent catalytic ability [13,14]. The relatively narrow bandgap (Eg = 1.8 eV), unique optical properties and layered structure of MoS 2 nanosheets have attracted more and more attention [15][16][17][18]. MoS 2 has been coupled with several two-dimensional (2D) materials and semiconductors, such as TiO 2 [19], graphene oxide (GO) [20], g-C 3 N 4 [21], SnO 2 [12], Bi 2 WO 6 [22], Bi 2 O 2 CO 3 [23], and CdS [24], in order to improve the efficiency of photocatalytic degradation and hydrogen production.…”

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

“…Compared with bare Bi 2 WO 6 , the ternary heterojunction composite has stronger redox capacity and exhibits better catalytic activity during the photodegradation of organic pollutants such as TC [ 36 ]. Long et al prepared 3D flower-like MoS 2 /Bi 2 S 3 heterostructures with excellent photocatalytic activity toward the photodegradation of low concentrations of organic pollutants [ 37 ]. The above results show that the successful construction of multi-component heterostructure can effectively improve the photocatalytic activity compared with a single component.…”