The enhanced photocatalytic performance of SnS@MoS QDs with highly-efficient charge transfer and visible light utilization for selective reduction of mythlen-blue.

Molybdenum disulfide (MoS) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS Quantum dots (QDs) were synthesized via the ultrasonication technique to construct heterostructure with SnS nanosheets (SnS@MoS QDs) and the prepared materials were tested for photocatalytic applications for Methylene blue (MB). Pristine SnS and SnS@MoS QDs nanocomposite were analyzed by XRD, TEM, PL, and Uv-Vis. Both SnS and SnS@MoS QDs exhibited a single trigonal phase with the P-3m1 space group. The TEM analysis confirmed the coupling between the pristine SnS and SnS@MoS QDs. The results of photocatalytic activity toward MB indicated that SnS@MoS QDs material exhibits much superior photocatalytic performance compared to pristine SnS. The excellent photodegradation performance of SnS@MoS QDs is due in the main to the formation of heterojunction between SnS and MoS QDs with narrow bandgap formation, which results in a facile carriers transfer and thus high photocatalytic efficiency. A representative mechanism of the photodegradation for SnS@MoS QDs photocatalyst was proposed. Such an ultrasonic technique is capable of producing small metallic particle size that can be used to construct new heterostructures for water remediation applications.