MoS2 Quantum Dots Decorated NH2-MIL-125 Heterojunction: Preparation and Visible Light Photocatalytic Performance

doi:10.15541/jim20190010

Abstract

Abstract:

MoS₂ quantum dots (QDs) decorated NH₂-MIL-125 (MoS₂ QDs/NH₂-MIL-125) heterostructures were successfully fabricated by a facile method. XRD results exhibit that NH₂-MIL-125 and MoS₂ form crystals in the synthesis process of MoS₂ QDs/NH₂-MIL-125 heterojunctions. TEM results demonstrated clearly that the MoS₂ Quantum dots with size of about 4 nm successfully disperse on the surface of NH₂-MIL-125 plate. Compared with bulk MoS₂ and NH₂-MIL-125, the MoS₂ QDs/NH₂-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 MoS₂ and NH₂-MIL-125, respectively. Meanwhile, MoS₂ QDs/NH₂-MIL-125 composites exhibit good stability and reusability during cycle experiment. The excellent photocatalytic activity of MoS₂ QDs/NH₂-MIL-125 heterostructures is attributed to the formation of heterojunctions between MoS₂ QDs and NH₂-MIL-125, Tacilitating separation of the photogenerated charge carries. PL results prove that MoS₂ QDs/NH₂-MIL-125 composites own lower recombination of photogenerated electrons and holes, resulting in superior photocatalytic ability.

Key words: MoS₂ quantum dots(QDs), metal-organic frameworks, heterojunction, photocatalysis

CLC Number:

TB34

HAN Li, ZHANG Xiao-Min, WU De-Yong. MoS₂ Quantum Dots Decorated NH₂-MIL-125 Heterojunction: Preparation and Visible Light Photocatalytic Performance[J]. Journal of Inorganic Materials, 2019, 34(11): 1205-1209.

Figures/Tables 5

Fig. 1 TEM images (a, b), HRTEM images (c, d) and the partial element mappings (e, f) of MoS2 QDs/NH2-MIL-125 composites

Fig. 2 XRD patterns of bulk MoS2, NH2-MIL-125 and MoS2 QDs/NH2-MIL-125 composites

Fig. 3 (a) Photocatalytic activity and (b) plot of -ln(C/C0) of bulk MoS2, NH2-MIL-125 and MoS2 QDs/NH2-MIL-125 composites over MO as a function of irradiation time

Fig. 4 UV-Vis diffuse reflectance spectra (a) and PL spectra (b) of NH2-MIL-125 and MoS2 QDs/NH2-MIL-125 composites

Fig. 5 Stability test of MoS2 QDs/NH2-MIL-125 composites for MO degradation under visible light irradiation

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MoS₂ Quantum Dots Decorated NH₂-MIL-125 Heterojunction: Preparation and Visible Light Photocatalytic Performance

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