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<p>In the work, hexagonal molybdenum trioxide (h-MoO<sub>3</sub>) was synthesized via the hydrothermal reaction between ammonium heptamolybdate tetrahydrate (AHM) and concentrated nitric acid, and different technologies, such as XRD, FESEM, UV–vis DRS, PL, BET method and laser particle size analyzer, were adopted to characterize the experimental data. The results revealed that, when the reaction time was in the range of 8–14&#xa0;h, single‑phase h-MoO<sub>3</sub> with the hexagonal-shaped morphology was synthesized; however, when the reaction time increased to 16&#xa0;h, orthorhombic molybdenum trioxide (<i>α</i>-MoO<sub>3</sub>) with the platelet-shaped morphology would form. The photocatalytic experiment results demonstrated that, with the increase of initial Rhodamine B (RhB) concentration, the degradation efficiency was gradually decreased; however, with the increase of h-MoO<sub>3</sub> dosage, the degradation efficiency showed a trend of first increase and then decrease. Due to the higher BET specific surface area (2.1801 m<sup>2</sup>/g), smaller particle size (1.06&#xa0;μm), and lower recombination rate of photo-generated electron–hole pairs, h-MoO<sub>3</sub> micro-rods synthesized at 160℃ for 14&#xa0;h exhibited a more excellent photocatalytic performance, with the degradation efficiency up to 98.28%. Additionally, the possible degradation mechanism was proposed.</p>

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Hydrothermal synthesis of h-MoO3 catalyst for Rhodamine B degradation under visible light

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Bing-Han Sun,
  • Lu Wang,
  • Lin-Lin Duan,
  • Yu-Qing Wang

摘要

In the work, hexagonal molybdenum trioxide (h-MoO3) was synthesized via the hydrothermal reaction between ammonium heptamolybdate tetrahydrate (AHM) and concentrated nitric acid, and different technologies, such as XRD, FESEM, UV–vis DRS, PL, BET method and laser particle size analyzer, were adopted to characterize the experimental data. The results revealed that, when the reaction time was in the range of 8–14 h, single‑phase h-MoO3 with the hexagonal-shaped morphology was synthesized; however, when the reaction time increased to 16 h, orthorhombic molybdenum trioxide (α-MoO3) with the platelet-shaped morphology would form. The photocatalytic experiment results demonstrated that, with the increase of initial Rhodamine B (RhB) concentration, the degradation efficiency was gradually decreased; however, with the increase of h-MoO3 dosage, the degradation efficiency showed a trend of first increase and then decrease. Due to the higher BET specific surface area (2.1801 m2/g), smaller particle size (1.06 μm), and lower recombination rate of photo-generated electron–hole pairs, h-MoO3 micro-rods synthesized at 160℃ for 14 h exhibited a more excellent photocatalytic performance, with the degradation efficiency up to 98.28%. Additionally, the possible degradation mechanism was proposed.