Abstract
The increase in environmental pollution has led to an increased investigation in the development of novel ternary photocatalytic systems for remediation. These photocatalytic systems exhibit superior photocatalytic action for the removal of pollutants because of their visible light active bandgaps. A highly effective visible light active ternary heterojunction was fabricated using a hydrothermal method assisted by ultrasonication. Herein, we report the in situ hydrothermal synthesis of Mn-doped Bi2WO6-GO/ MoS2 photocatalyst, efficiently exhibiting greater photocatalytic activity for the wastewater treatment under solar light. The binary metal sulphide (MoS2) used as a co-catalyst, acted as an electron collector and graphene oxide (GO) as a support material for interfacial electron transfer to and from bismuth tungstate and MoS2. The as-prepared samples were characterized using SEM-EDX, FT-IR, XRD, XPS, BET, PL, and UV-Vis techniques. The bandgap of the novel photocatalyst was found in the visible region (2.2 eV) which helped in suppressing photoinduced electron-hole pairs recombination. The ternary Mn-doped Bi2WO6-GO/MoS2 showed 99% methylene blue removal after 60 minutes of sunlight irradiation at the optimum conditions of pH 8, catalyst dose 50 mg/100ml, and initial MB concentration of 10ppm under sunlight irradiation. The doped ternary heterostructure has proved to be an effective sunlight-active photocatalyst that can be reused without substantial loss in photocatalytic efficiency.
Highlights
Water pollution and energy crisis has become a global threat due to rapid industrialization
The nanocomposites in different concentrations were initially screened in Ultraviolet and Visible irradiation to check the feasibility of the Methylene Blue (MB) degradation
3.3 SEM analysis: The morphology and microstructure of as-synthesized pristine and doped samples were investigated by Scanning electron microscope (SEM) at various resolutions
Summary
Water pollution and energy crisis has become a global threat due to rapid industrialization. Transition metal doping includes use of transition metals like Cobalt, niobium, manganese, zinc, tungsten, iron and molybdenum for modifying the d-orbital configuration, the fermi level and the bandgap (Huang et al, 2016).The transition metals have partially filled d orbitals which helps in the formation of new energy bands below the conduction band of host material These newly formed energy bands are responsible for redshift in the bandgap energy enabling photocatalysts to act efficiently in the visible range of light spectra (Ahmad, 2019). Mn-Bi2WO6 coupled with MoS2 provided enhanced surface area and an easy pathway for the transport and separation of photogenerated charge carriers effectively increasing the visible light response of photocatalyst
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