Fabrication and Characterization of MoS2 QDs Decorated NH2-MIL-125 Heterojunction with Enhanced Visible Light Photocatalytic Performance

Abstract

MoS 2 quantum dots (QDs) decorated NH 2 -MIL-125 (MoS 2 QDs/NH 2 -MIL-125) heterostructures were successfully fabricated by a facile method.XRD results exhibit that NH 2 -MIL-125 and MoS 2 form crystals in the synthesis process of MoS 2 QDs/NH 2 -MIL-125 heterojunctions.TEM results demonstrated clearly that the MoS 2 Quantum dots with size of about 4 nm successfully disperse on the surface of NH 2 -MIL-125 plate.Compared with bulk MoS 2 and NH 2 -MIL-125, the MoS 2 QDs/NH 2 -MIL-125 heterostructures exhibit enhanced photocatalytic performance in degradation of methyl orange under visible light irradiation, about 5.8 and 7.4 times higher that of pure bulk MoS 2 and NH 2 -MIL-125, respectively.Meanwhile, MoS 2 QDs/NH 2 -MIL-125 composites exhibit good stability and reusability during cycle experiment.The excellent photocatalytic activity of MoS 2 QDs/NH 2 -MIL-125 heterostructures is attributed to the formation of heterojunctions between MoS 2 QDs and NH 2 -MIL-125, Tacilitating separation of the photogenerated charge carries.PL results prove that MoS 2 QDs/NH 2 -MIL-125 composites own lower recombination of photogenerated electrons and holes, resulting in superior photocatalytic ability.