• Investigation of visible light photocatalytic degradation of organic dyes by MoS$_2$ nanosheets synthesized by different routes

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    • Keywords


      Photocatalysis; hydrothermal method; liquid exfoliation-photodegradation; percentage degradation; rate constant.

    • Abstract


      In this work, we have synthesized MoS$_2$ nanosheets (NSs) through hydrothermal as well as liquid-phase sonication methods and studied their ability to degrade organic dyes, methyl red (MR) and methylene blue (MB) undervisible light irradiation. The as-synthesized photocatalysts have been characterized by powder X-ray diffraction, Raman Spectroscopy and transmission electron microscopy to confirm their structure and surface morphology. XRD patterns show that crystalline nature of MoS$_2$ NSs prepared by hydrothermal method appears at 160°C for 15 h. In contrast, sharp and intense diffraction peaks appear for liquid exfoliation method even at room temperature, exhibiting better crystallinity of the as-prepared NSs. The difference (${\Delta}$) of ${\sim}$25 cm$^{-1}$ between E$^1$$_{2g}$ and A$_{1g}$ modes of Raman spectra indicates formation of 5–6 layers of MoS$_2$ from both the synthesis routes. UV–V is spectroscopy has been utilized to study the degradation of dyes by MoS$_2$ NSs as catalyst. Hydrothermally assisted synthesis of MoS$_2$ NSs exhibit lesser degradation efficiency with 58.92% for MR and 49.28% for MB, while exfoliation-assisted MoS$_2$ NSs act as better photocatalyst with 63.40 and 62.40% degradation of MR and MB, respectively. Faster degradation rate for MR compared to MB has been attributed to the presence of lesser chromophoric sites in MR.

    • Author Affiliations



      1. Department of Physics, School of Basic and Applied Sciences, Maharaja Agrasen University, Solan 174103, India
      2. Department of Chemistry, School of Basic and Applied Sciences, Maharaja Agrasen University, Solan 174103, India
    • Dates

  • Bulletin of Materials Science | News

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