Construction of 3D sheet-packed hierarchical MoS2/BiOBr heterostructures with remarkably enhanced photocatalytic performance for tetracycline and levofloxacin degradation

Abstract

Abstract In this paper, MoS2 nanosheets were prepared and deposited on BiOBr microflowers to fabricate MoS2/BiOBr heterojuncitons through deposition-hydrothermal strategy. The SEM and TEM images evidenced that few-layer MoS2 were grafted on BiOBr surface to yield 3D sheet-packed MoS2/BiOBr heterostructures. The obtained MoS2/BiOBr samples exhibited tremendous enhanced catalytic activity in comparison with pure BiOBr and the degradation rate reached 92.96% and 90.31% for tetracycline and levofloxacin degradation, respectively. The remarkably enhanced performance could be attributed to the synergistic effect of strong visible-light harvesting ability and the formation of heterojunction between MoS2 and BiOBr. The reactive species capturing experiments evidenced that photo-generated holes and ⋅OH radicals played the dominant roles in the whole photocatalytic decomposition process. A plausible mechanism for the enhanced photocatalytic capability was also proposed.