Molybdenum Disulfide-Based Nanomaterials for Visible-Light-Induced Photocatalysis

Abstract

Visible-light-responsive photocatalytic materials have a multitude of important applications, ranging from energy conversion and storage to industrial waste treatment. Molybdenum disulfide (MoS 2 ) and its variants exhibit high photocatalytic activity under irradiation by visible light as well as good stability and recyclability, which are desirable for all photocatalytic applications. MoS 2 -based materials have been widely applied in various fields such as wastewater treatment, environmental remediation, and organic transformation reactions because of their excellent physicochemical properties. The present review focuses on the fundamental properties of MoS 2 , recent developments and remaining challenges, and key strategies for tackling issues related to the utilization of MoS 2 in photocatalysis. The application of MoS 2 -based materials in visible-light-induced catalytic reactions for the treatment of diverse kinds of pollutants including industrial, environmental, pharmaceutical, and agricultural waste are also critically discussed. The review concludes by highlighting the prospects of MoS 2 for use in various established and emerging areas of photocatalysis.

1D/2D Hybrid Te/Graphene and Te/MoS2: Multifaceted Broadband Photonics and Green-Energy Applications

“…For pristine systems, the positions of A and B excitons are at energies 1.31 and 1.33 eV, respectively, as indicated by the blue lines of Figure g,h. The exciton positions are energetically underestimated due to the approximations used in the long-range exchange–correlation kernel, as mentioned in Section S2 of SI and also seen in the prior literature . In the TDDFT spectra for the heterojunctions of MoS 2 , there is a significant shift in the energy positions of the A and B excitons toward higher range by ∼1 eV, as seen in the black plots of Figure g,h.…”

“…The exciton positions are energetically underestimated due to the approximations used in the long-range exchange−correlation kernel, as mentioned in Section S2 of SI and also seen in the prior literature. 52 In the TDDFT spectra for the heterojunctions of MoS 2 , there is a significant shift in the energy positions of the A and B excitons toward higher range by ∼1 eV, as seen in the black plots of Figure 4g,h. The binding energies of the excitons are expressed as the difference in energies of the position of the excitons in the TDDFT-derived absorbance graph with the static optical band gap.…”

“…However, because of the short lifetime of the hot carriers as a result of their ultrafast recombination and the resulting limited responsivity of metal-contacted bare graphene detectors and p–n junctions, − there are continuous efforts to enhance the performance upon coupling with microcavities, , plasmonic structures, , quantum dots, or fabricating stacked structures with TMDC , and thus increasing the lifetime of the carriers through physical separation. TMDC systems like MoS 2 in its monolayer form have displayed optical activity in the visible range. , A multitude of efforts have been dedicated to obtaining broadband photodetection from monolayer or multilayered MoS 2 after combining them with plasmonic nanostructures or other TMDC systems . α-Te, on the other hand, is a direct-band-gap semiconductor, having excellent optical activity in the FIR range. − Moreover, it is a well-known 1D van der Waals material, consisting of an a – b plane van der Waals stacked array of c -axis-oriented single helices of Te and thus can be transformed into an extremely thin 1D helix by using standard liquid-crystal exfoliation techniques.…”

Molybdenum disulfide (MoS2) based photoredox catalysis in chemical transformations

“…The most used methods are solid-state, 24 hydrothermal, 25,26 solvothermal, 27 and hybrid methods. 28,29…”

Fe-Doped MoS2 Nanozyme for Antibacterial Activity and Detoxification of Mustard Gas Simulant

“…Owing to the narrow band gap in the semiconducting TMDs, these materials can easily generate electron and hole (e – /h + ) pairs. , Two-dimensional molybdenum disulfide (2D-MoS 2 ), a typical TMD, owing to its unique photophysical and chemical properties, has been extensively used in different applications such as biomedicine, , catalysis, energy storage, electronic devices, and antibacterial activity. − The photocatalytic activity of MoS 2 is used in multimodal applications in various fields, including wastewater treatment, organic transformation reactions, and environmental remediation. − Several MoS 2 -based biosensors have been developed such as carbon dots/MoS 2 nanocomposite-based immunosensors used for the detection of cardiac troponin T. , In particular, the intrinsic peroxidase-like activity of MoS 2 nanomaterials is utilized in quantitative detection of bioanalytes such as glucose, H 2 O 2 , and cholesterol. , Moreover, the peroxidase-like activity of polyethylene glycol functionalized nano-MoS 2 used for the wound infection . The Borthakur group has reported that the CuS nanoparticle-decorated MoS 2 nanozyme exhibits photocatalytic degradation of hydroquinone .…”