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<p>Nickel ferrite (NiFe<sub>2</sub>O<sub>4</sub>) is a prospective magnetic semiconductor material for applications in photocatalysis, but its actual performance is limited due to inefficient charge transfer and rapid electron–hole recombination. To overcome these drawbacks in the present work, NiFe<sub>2</sub>O<sub>4</sub> was tailored by incorporating steric hindrance provided by cobalt and lanthanum. The Co, La doped and La/Co co-doped NiFe<sub>2</sub>O<sub>4</sub> nanopowders were prepared by a facile co-precipitation method. Effect of doping on the crystal structure, morphology, optical properties, and photocatalytic activity was investigated with XRD, FESEM, UV–Vis absorption spectroscopy, Raman spectroscopy, FTIR analysis, photoluminescence spectrum, and photocatalytic degradation performance studies. The structural analysis showed that the cubic spinel phase was maintained after doping, and morphological observations revealed better particle distribution with a decrease in agglomeration. We found that both doping enhanced the electronic transitions and reduce the recombination probability in the doped samples from optical measurements. The photocatalytic activity was also determined by the degradation of methylene blue under visible light, and the results were 38% for pure NiFe<sub>2</sub>O<sub>4</sub>, 69% for Co@NiFe<sub>2</sub>O<sub>4</sub>, and 82% for La@Co@NiFe<sub>2</sub>O<sub>4</sub>. The higher activity of the co-doped sample is due to better utilization of light and efficient separation of charge carriers, which are determined from combined effect of Co and La doped. These findings provide evidence that controlled co-doping is a successful approach to enhance the visible-light photocatalytic performance of NiFe<sub>2</sub>O<sub>4</sub>-derived nanomaterials.</p>

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Synergistic enhancement of photocatalytic and functional properties in Co and La co-doped NiFe2O4 nanoparticles for environmental and energy applications

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • G. Myvizhi,
  • S. Malathi,
  • C. Moganasundari,
  • V. Vijayalakshmi

摘要

Nickel ferrite (NiFe2O4) is a prospective magnetic semiconductor material for applications in photocatalysis, but its actual performance is limited due to inefficient charge transfer and rapid electron–hole recombination. To overcome these drawbacks in the present work, NiFe2O4 was tailored by incorporating steric hindrance provided by cobalt and lanthanum. The Co, La doped and La/Co co-doped NiFe2O4 nanopowders were prepared by a facile co-precipitation method. Effect of doping on the crystal structure, morphology, optical properties, and photocatalytic activity was investigated with XRD, FESEM, UV–Vis absorption spectroscopy, Raman spectroscopy, FTIR analysis, photoluminescence spectrum, and photocatalytic degradation performance studies. The structural analysis showed that the cubic spinel phase was maintained after doping, and morphological observations revealed better particle distribution with a decrease in agglomeration. We found that both doping enhanced the electronic transitions and reduce the recombination probability in the doped samples from optical measurements. The photocatalytic activity was also determined by the degradation of methylene blue under visible light, and the results were 38% for pure NiFe2O4, 69% for Co@NiFe2O4, and 82% for La@Co@NiFe2O4. The higher activity of the co-doped sample is due to better utilization of light and efficient separation of charge carriers, which are determined from combined effect of Co and La doped. These findings provide evidence that controlled co-doping is a successful approach to enhance the visible-light photocatalytic performance of NiFe2O4-derived nanomaterials.