One-step synthesis of rod-on-plate like 1D/2D-NiMoO4/BiOI nanocomposite for an efficient visible light driven photocatalyst for pollutant degradation
2022
Bavani, Thirungnanam | Vinesh, Vasudevan | Neppolian, Bernaurdshaw | Murugesan, Sepperumal | Selvaraj, Manickam | Madhavan, Jagannathan
Visible light active 1D/2D-NiMoO₄/BiOI nanocomposite photocatalyst has been constructed by single step solvothermal method. Various compositions of NiMoO₄/BiOI nanocomposites are prepared by loading different amounts of nickel molybdate (NiMoO₄) (1, 2, 3 wt%) to the bismuth oxy iodide (BiOI) and investigated by XRD, FTIR, SEM, EDAX, TEM, UV–vis DRS, and PL analysis. Among the as-prepared photocatalysts, 1 wt% NiMoO₄ incorporated BiOI (NMBI-1) showed superior photocatalytic activity with a rate constant of 0.0442 min⁻¹ for methylene blue degradation. While the bandgap values of pure BiOI and NiMoO₄ are 1.94 and 2.43 eV, respectively, the optimized NMBI-1 exhibited a lower bandgap energy of 1.64 eV, and showed about 2 and 3.7 times higher photodegradation ability than the pure NiMoO₄ and BiOI, respectively, towards MB removal under visible light. The NMBI-1 nanocomposite photocatalyst is stable even after four cycles, indicating an excellent photostability and recyclability. Charge carriers on the interface of NiMoO₄ and BiOI easily transferred via the newly formed heterojunction, thereby increasing the photocatalytic performance. Photochemically formed h⁺ and.OH are found to be the major species in the MB removal under visible light illumination. Therefore, the 1D/2D-NiMoO₄/BiOI nanocomposite photocatalyst materials may be considered for the wastewater remediation processes.
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