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<p>A novel NiTiO<sub>3</sub>/TiO<sub>2</sub> heterostructure was synthesized via a green sol–gel method using lemon juice as a natural precursor. The phase formation, structural, morphological, and optical properties of the synthesized composite were investigated using x-ray diffraction (XRD), Raman scattering, field-emission scanning electron microscopy (FESEM), and diffuse reflectance spectroscopy. XRD and Raman scattering results confirm the coexistence of both ilmenite NiTiO<sub>3</sub> and TiO<sub>2</sub> phases in the composite. The TiO<sub>2</sub> phase in the composite undergoes temperature-dependent phase transformation: it exists as anatase when calcined at 600°C, a mixture of anatase and rutile at 700°C, and pure rutile at 800°C. FESEM reveals that the synthesized NiTiO<sub>3</sub> particles exhibit spherical nanostructures. The NiTiO<sub>3</sub>/TiO<sub>2</sub> composites were investigated for their sonocatalytic activity in the degradation of rhodamine B under ultrasonic irradiation. The composite exhibited significantly enhanced sonocatalytic performance compared to pure NiTiO<sub>3</sub>, which can be attributed to the improved interfacial charge transfer and the synergistic effects between NiTiO<sub>3</sub> and TiO<sub>2</sub>. These results highlight the potential of green-processed composites in advanced oxidation processes for wastewater treatment.</p> Graphic abstract <p></p>

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Synthesis of NiTiO3/TiO2 Composite Nanoparticles by a Green Approach: Application as Sonocatalyst for Dye Degradation

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Vu Dang Khoa,
  • Luong Huu Bac

摘要

A novel NiTiO3/TiO2 heterostructure was synthesized via a green sol–gel method using lemon juice as a natural precursor. The phase formation, structural, morphological, and optical properties of the synthesized composite were investigated using x-ray diffraction (XRD), Raman scattering, field-emission scanning electron microscopy (FESEM), and diffuse reflectance spectroscopy. XRD and Raman scattering results confirm the coexistence of both ilmenite NiTiO3 and TiO2 phases in the composite. The TiO2 phase in the composite undergoes temperature-dependent phase transformation: it exists as anatase when calcined at 600°C, a mixture of anatase and rutile at 700°C, and pure rutile at 800°C. FESEM reveals that the synthesized NiTiO3 particles exhibit spherical nanostructures. The NiTiO3/TiO2 composites were investigated for their sonocatalytic activity in the degradation of rhodamine B under ultrasonic irradiation. The composite exhibited significantly enhanced sonocatalytic performance compared to pure NiTiO3, which can be attributed to the improved interfacial charge transfer and the synergistic effects between NiTiO3 and TiO2. These results highlight the potential of green-processed composites in advanced oxidation processes for wastewater treatment.

Graphic abstract