Oxygen doping and interface engineering in O-MoS2&rGO heterostructure for efficient piezocatalytic dye degradation

To further apply MoS 2 as a promising non-noble catalyst for addressing environmental issues, its catalytic ability must be improved. As a result of the hetero-atom doping effect and varied structure phase of MoS 2 , we demonstrated excellent piezocatalysis for the degradation of methylene blue (MB) dye under stirring/ultrasonic catalyzed by MoS 2 . Compared with pristine MoS 2 and O-doping MoS 2 (O-MoS 2 ), O-MoS 2 & reduced graphene oxide (O-MoS 2 &rGO) exhibits enhanced piezocatalytic activity. When the initial concentration of MB solution is ≤ 15 mg L −1 , both stirring and ultrasonication can make the optimal O-MoS 2 &rGO composite to degrade the dye completely within 20 min. The experimental results have led to the proposal of a mechanism that elucidates the enhancement effect of rGO and O doping on the piezocatalytic performance of MoS 2 . This study highlights the significance of constructing heterostructure interfaces and the impact of hetero-atom doping on the promotion of piezocatalysis efficiency. Graphical abstract Boosting the catalytic ability of MoS 2 is vital to its further application as a class of promising non-noble catalysts to address environmental issues. Benefiting from the O-doping-induced electronic effect and interfacial coupling and synergistic effect between MoS 2 and reduced graphene oxide (rGO), the as-prepared O-MoS 2 &rGO heterogeneous catalyst exhibits enhanced degradation efficiency for methylene blue (MB) dye.